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which is the best battery for xda iis

hi all,
I've just bought a 2nd-hand XDA iis and is battery is not so good.
So I intend to buy a new one.
But I'm wondering which bat is the best now.
I've gone to ebay and see that they have some types: original 1500 mAh, 2400mAh, "slim" 3200 mAh and "fat" 3600mAh.
I think the 3600mAh is the most suited for my xda.
Is there any better choice? Where could I buy it?
With the 3600mAh, how long would the xda would last if I use wifi IE with the lowest backlight?
Do any of you have any problems with it?
Could I use my old charger or Do I have to buy a bigger one?
Could I still use my usb-cable (not cradle) for charging my xda?
And is there any conflict with WM5? (I've just read in our forum that someone have problems with WM6).
Thank all of you so much.

son_volam002 said:
But I'm wondering which bat is the best now.
I've gone to ebay and see that they have some types: original 1500 mAh, 2400mAh, "slim" 3200 mAh and "fat" 3600mAh.
Click to expand...
Click to collapse
I would say that primarly it would depend on if a 'fatter' and heavier phone bothers you.
Keep in mind that just about all the cases and various accessories that hold or clip on to the phone are designed for a phone that has the original battery, so a thicker battery may well make them unusable (cases are the primary example I would give).
How long it would last is impossible to say, as it depends on how you use the phone, what apps are on the phone, and so on. Also, 3rd party battery quality does vary. Which manufacture is the best, I can't say as I've never seen any place that reviews battery life.
I've never heard of any incompatibilities when talking about a particular version of win mobile and a certain capacity battery, and can't imagine that it's even possible.
Pick one and see what you get, then post the results here so the every one else can benefit from your experience.

jdc said:
I would say that primarly it would depend on if a 'fatter' and heavier phone bothers you.
Keep in mind that just about all the cases and various accessories that hold or clip on to the phone are designed for a phone that has the original battery, so a thicker battery may well make them unusable (cases are the primary example I would give).
How long it would last is impossible to say, as it depends on how you use the phone, what apps are on the phone, and so on. Also, 3rd party battery quality does vary. Which manufacture is the best, I can't say as I've never seen any place that reviews battery life.
I've never heard of any incompatibilities when talking about a particular version of win mobile and a certain capacity battery, and can't imagine that it's even possible.
Pick one and see what you get, then post the results here so the every one else can benefit from your experience.
Click to expand...
Click to collapse
At last, I've bought a fat 3600 battery and I think it's a good decision.
Now, I can use my fone for browse Internet in near 6 hour with wifi; or I could use it with 5 day stanby (how amazing).
some small problems are:
- the fone is thicker and heavier (no problem with me).
- My third party charger is a bit hotter.
- And the charging time is longer (ofcourse).

do not by batteries by ACME power. I have bought 2400mAh and feel no difference compare to standard old battery. Besides, I have troubles with bt. it turns off by its self with only this battery.

I bought a battery for my Htc Harrier about 4-5 months ago. Sorry i dont know the brand of it but its says its 3200mah and "replacement for XDAIII". The inside of the battery is kind of bloated out from the heat and looks a little dodgy but still works. Ive had a few problems with it where it powers off for no reason. When i turn it on again the battery charge looks fine.
Just a couple of days ago for the first time my phone just completely hard resetted and lost all my data. I again turned it on and the battery charge was fine. im blaming that on my battery.
I use my phone mainly for listening to music on my bluetooth headphones while im driving to school and for typing things out on my bluetooth keyboard at school. The standared battery that comes with the phone simply has not enough charge time to do all this.
With all its annoying problems i still use my battery. I just make sure i back up my most important things on my storage card. And charge it every night.
Soon im going to buy a HTC Blue Angel due to my countrys crappy plans that the Harrier comes with. Maybe i might buy the 3600mah while im at it.
So my advice is if you dont need the charge of a extended battery then stay away. Unless you are like me and need the extra battery power then beware of some stress ahead that it might give you.

Innocell 1600mAh Slim Extended Life Battery for Samsung Nexus S

http://cheapdroids.com/Innocell-1600mAh-Slim-Extended-Life-Battery-for-Samsung-Nexus-S.html
what you think?

Well they've a 3500 for evo so I'll wait

That's not a huge difference and 50 dollars is a bit steep for me.

leyvatron said:
That's not a huge difference and 50 dollars is a bit steep for me.
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Click to collapse
$50 for aprox 30min to 1 extra hour of battery life.... it's a bit hard to swallow indeed.
but it's worth it if you do really need that extra time
personally i carry 2 extra battery packs with me, so ... extra mAh is not that big of a concern

thommcg said:
Well they've a 3500 for evo so I'll wait
Click to expand...
Click to collapse
IMO, the 3000+ mAh batteries are hideous with their custom battery covers. I'd rather go the 2 battery route lol

This is only marginally on-topic, but it's been on my mind. Phones are so slim now, why not just make batteries that have the same height and width of the body of the phone? Sure it'll make the phone some fraction of a centimeter thicker and a couple ounces heavier, but you could use the thing screen on all day if you wanted to, and with moderate use it'd easily go three or four. It would take longer to charge, of course, but it'd probably still easily go from 0-100% overnight, not that you'd normally need it to.

AllGamer said:
personally i carry 2 extra battery packs with me, so ... extra mAh is not that big of a concern
Click to expand...
Click to collapse
Hi
Where did you get the extra batteries from?
Gx
Sent from my Nexus S using XDA App

squattingb said:
because batteries don't work like that, from what you're saying, I'm assuming you want a thin but wide battery that spans the entire phone surface area, the thing is... batteries work on stored capacitance and the physics of it doesn't allow a battery to store charge if you design it in the way you mentioned. sorry that would be nice though!
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Click to collapse
Dude wtf, spewing some trash talk there.
You can design a battry in any shape aslong as its not tubular.
the cells should be of same sizes and capcatance, you colud make a thin battery 90% of the internal surface area of any device aslong as the device is desinged for it.
Hell have you seen button batterys / model aircraft nicads e.c.t they come in all kinds of sizes.
tbh the phone company's just skimp on batterys you could makr a phone with a 3000mha batt as standard if they gave more room to batts, if you strip down many phones you could trim the fat and easly get another 500mha out...

its not the shape of the battery that matters its the volume of the chemicals inside, it could be flat and wide and have the same capacity as a thick but smaller battery. chemistry man, chemistry.

So has anyone actually used this?
Sent from my Nexus S using Tapatalk

Sorry to bring up an old thread.
Anyway is there any actual usage which show the difference between this battery and the stock?
Sent from my Nexus S using XDA Premium App

dplate07 said:
Sorry to bring up an old thread.
Anyway is there any actual usage which show the difference between this battery and the stock?
Sent from my Nexus S using XDA Premium App
Click to expand...
Click to collapse
IMO most battery useage claims are very hard to prove. People can claim they got an hour or two more of useage, but no two days of use are going to be identical. The screen wont be powered on the exact same amount. You wont receive / send the same amount of messages , you wont check your tweets the same amount, you wont start the day with the same exact charge, etc. Its very hard for the average user to set up an objective test for this sort of thing. Individual batteries, including stock, will also vary depending on condition. The numbers are there, but like all things - your mileage may vary. With that being said Seido is a very reputable company, and I'd trust their product over some eBay brand (reference another thread).
Sent from my Nexus S using Tapatalk

DumbUglyDragon said:
IMO most battery useage claims are very hard to prove. People can claim they got an hour or two more of useage, but no two days of use are going to be identical. The screen wont be powered on the exact same amount. You wont receive / send the same amount of messages , you wont check your tweets the same amount, you wont start the day with the same exact charge, etc. Its very hard for the average user to set up an objective test for this sort of thing. Individual batteries, including stock, will also vary depending on condition. The numbers are there, but like all things - your mileage may vary. With that being said Seido is a very reputable company, and I'd trust their product over some eBay brand (reference another thread).
Sent from my Nexus S using Tapatalk
Click to expand...
Click to collapse
Best thing to do probably is:
1. Fully charge
2. Go into airplane mode
3. Set up looping video at full brightness
4. Unplug
5. record battery life on reboot after it dies
6. Repeat with next battery
can't get much more consistent than that.
Sent from my Nexus S using Tapatalk

im good with the battery time of my original.

[Q] Droid 4 Battery hack

I wondering if it will be possible to do a hack on the Droid 4 to upgrade the battery some how? Battery life right now isn't that bad, but could diffidently use a extended battery. I would think it would be possible, if anybody was interested in building a battery for the droid 4.

YahyaIsrael said:
I wondering if it will be possible to do a hack on the Droid 4 to upgrade the battery some how? Battery life right now isn't that bad, but could diffidently use a extended battery. I would think it would be possible, if anybody was interested in building a battery for the droid 4.
Click to expand...
Click to collapse
Does the Droid 4 have an in-built battery like the Droid RAZR? If so, the only option would be something like a Mophie JuicePak, a case with a built-in battery to extend the regular cell.
A more likely scenario, if Development is able to get that far, is a custom Kernel with a more efficient set of commands and code to enable us to squeeze a little more life out of the battery. That's assuming Development gets off the ground

juzz86 said:
Does the Droid 4 have an in-built battery like the Droid RAZR? If so, the only option would be something like a Mophie JuicePak, a case with a built-in battery to extend the regular cell.)
Click to expand...
Click to collapse
Yes it is build in . Just thinking maybe a backpack sort of add on cover, to extend the battery, of course without having to connect over the USB port.

I don't see what's stopping an aftermarket manufacturer from producing a thicker battery and an aftermarket backplate to the phone. All you need to do is open the backplate, peel the sticker off, and use a T-5 torx screwdriver to remove the battery connector. The phone comes with the back-plate removal tool. It's not complicated.
see: ifixit.com/Teardown/Motorola-Droid-4-Teardown/7759/1
So, yes, it's technically possible. Unfortunitely, the RAZR MAXX battery will not fit in the D4 cavity, and the connector locations are different. So, you can't make your own home-grown Motorola Droid 4 MAXX. ifixit.com/Teardown/Motorola-Droid-RAZR-Teardown/7048/1
(lost my old XDA account login, excuse my inability to post clickable links)

I remember reading about a gent who already removed his D4 battery to see what other options could be found. The dis-assembly went easy enough, but there were major issues when he put it back in. Don't know if those were user created problems or what, but proceed at your own risk, as always!

It appears that there is connections for a wireless charger back cover. Therefore these connectors could be used to connect a second battery. Hopefully an aftermarket company will take notice and invent a product that will work for this.

The battery in mine seems to last pretty long. Is this modification for the sake of modification? I turned off push mail, and suddenly I have ah all day battery life.
Sent from my DROID4 using XDA App

back from the dead - anyone seen any news on this? i particularly like the idea of using the charging contacts for the wireless charging cover, but using a battery backpack instead.
my d4 is on its way to me now, after my d2 had its flight license revoked following a high speed collision with a wall. the wall didn't fare too well either, but at least the wall is still functional. gotta learn to control that temper!
anyway, i have an aftermarket extended battery for my d2, rated at 3500mAh. i can go 2 days between charges, with what i consider regular use - that's probably 30 mins of calls, 200+ texts, loads of emails, some words/scramble w/ friends, 30-60 mins streaming internet radio, and some surfing every day. granted my d2 is rooted and running liberty, which practically doubled battery life. maybe rooting my d4 and debloating it (skype and other crap i don't want) will have the same effect to where i don't need an extended battery.

VZW sells an inductive charging back cover for the D4 already. That and a portable inductive batt. pack in a phone case and I think you'd be in business.

One of my favorite personal quotes: If it was put together my someone or something, then it can definitely be taken apart. The extra contacts seen on the battery are definitely made for magnetic induction (wireless charging etc) and can even be used (like other phones I've seen) as a way for the phone to know when it is "docked" to an accessory... EX: the lapdock/webtop situation. There is a known patch to throw our phones into webtop mode, tricking it into believing thaat it is actually docked to a physical lapdock. This sensing is done usually by magnetism/inductive signals, and triggers a response from the phone. I really don't think moto would electronically brick our phones if the batt was taken out, but who knows... yet? Hope I've given some insight!

I am ok with the battery life. I got 24 hours out of it with the 208 leak just a couple of days ago. I was on wifi though for about 18 of those hours.
In the ICS leaks all you have to do is plug in a hdmi between the phone and a TV. A menu pops up with webtop as an option.

My Experience with the D4 and battery life
I Started a new thread on the topic, I hadn't found this one yet. I've removed the battery from 2 droid 4's, and had one running off a pair of 18650's for a week. Phone will work, just gotta charge them via another method

well i've had my d4 for a while now, and i'm mildly disappointed in the battery life. it's better than i thought it would be, but still not enough to go all day. in my interior office on the 36th floor, where there's little/no cell signal, the d4 chews up the battery a lot faster than my d2 ever did. i tried using smart actions, but they're flaky at best, and actually make the phone become unstable and very crash-happy, so i deleted all the smart actions i'd created and now the phone is much less crashy, though it's not really what i'd call stable. about to un-root and reset it to see if that helps (doubt it), then exchange it at VZW.
right now i'm not-so-patiently waiting for the official ICS OTA update. hopefully ics will bring some better optimizations, and then some good roms based off the official release will be cooked up. i've always wanted to try cyanogen, but at this point i think i'd be happy with plain vanilla AOSP, without blur and bloat as long as it meant my battery would last all day with normal use.
at this point in the smartphone game, it reminds me of the PC world circa 1993. vendors forcing bloat that's difficult/impossible to remove, which hinders performance of the phone. something has to give at some point. hopefully they will make it so you can have a phone, download android from google, get drivers from motorola/htc/etc, and just roll your own. i mean really - who actually uses all the crap they preload on these things now? and especially now that data is not unlimited anymore (i'm grandfathered in thankfully), apps you don't want and can't get rid of are using data without permission - potentially driving up your bill! if that's not illegal, it should be!

markass530 said:
I Started a new thread on the topic, I hadn't found this one yet. I've removed the battery from 2 droid 4's, and had one running off a pair of 18650's for a week. Phone will work, just gotta charge them via another method
Click to expand...
Click to collapse
i'm not particularly opposed to carrying around some sort of Frankenphone, so this appeals to me. looks like mark doesn't post around here anymore so does anyone else know how you'd go about getting the 18650s powering a D4? if this works i'll probably cut a hole in the back panel to fit the batteries, might even be able to squeeze in a microSD-to-SD adapter for dat 128GB glory

Been reading about the battery situation...

Okay, I have been reading about how there is supposedly NO WAY you can change out the stock battery inside the case with a larger one. I understand that is so, but WHY exactly can you not solder in a new, larger unit instead please? Is there some sort of firmware that will only support the stock battery or is it another kind of issue?
Can anyone please explain it to me? I have advanced skills for soldering, so I can handle pretty much anything barring a motherboard issue...

Its a kernel issue. The battery is controlled by a custom driver.

giveen said:
Its a kernel issue. The battery is controlled by a custom driver.
Click to expand...
Click to collapse
I see, that is disappointing. Has anyone tried to tackle this? I'm guessing a resounding "NO". heh

I'm not positive that you couldn't use a larger capacity battery but it probably would be physically larger and probably wouldn't fit.
Not Li-Ion battery but I have replaced a 3800mAh battery with a 5000mAh with no problem at all. This was a Ni-MH battery but a Li-Ion battery charging is a far simpler than a Ni-MH. I was able to install a larger capacity battery cheaper then an OEM. I've been doing this for years.

As far as I can tell, there is plenty of room for a larger battery inside the unit, the main problem seems to be getting it to work, yet I cannot find a single instance of ANYONE actually trying to put one in...
Are you quite sure it could be that easy? I really like this little tablet, but two things bother me: The battery life -SUCKS- and I don't like carrying external batteries with me.
As it is now I can get it fully booted and online in under a minute and all that is needed is to keep it running for more than a few hours and I will be very happy. (Well, until we get a finished version of ICS I won't be really really happy, but LOL)

2BNDatte said:
As far as I can tell, there is plenty of room for a larger battery inside the unit, the main problem seems to be getting it to work, yet I cannot find a single instance of ANYONE actually trying to put one in...
Are you quite sure it could be that easy? I really like this little tablet, but two things bother me: The battery life -SUCKS- and I don't like carrying external batteries with me.
As it is now I can get it fully booted and online in under a minute and all that is needed is to keep it running for more than a few hours and I will be very happy. (Well, until we get a finished version of ICS I won't be really really happy, but LOL)
Click to expand...
Click to collapse
Why bother with ICS, when CM10.1 (Android 4.2.1) is more complete, better performance and battery life?
Also, look into your wifi sleep policy settings, this has a huge impact on battery usage when in standby.

2BNDatte said:
As far as I can tell, there is plenty of room for a larger battery inside the unit, the main problem seems to be getting it to work, yet I cannot find a single instance of ANYONE actually trying to put one in...
Are you quite sure it could be that easy? I really like this little tablet, but two things bother me: The battery life -SUCKS- and I don't like carrying external batteries with me.
As it is now I can get it fully booted and online in under a minute and all that is needed is to keep it running for more than a few hours and I will be very happy. (Well, until we get a finished version of ICS I won't be really really happy, but LOL)
Click to expand...
Click to collapse
The algorithm for charging a Li-Ion cell is simple. It won't matter what the capacity of the cell is but the charging rate is something that you can't change so it'll take longer to charge.
I have a automotive scope that uses 1600 mAh 7.2V Ni-MH pack stuck inside the unit. A PITA to change, it had standard RC type connectors so I installed a extender to go outside the unit. The OEM packs use "AA" cells but I had a 7.2V pack built using 5000 mAh sub "C" cells which I Velcro to the case. I could have used "D" cells which are up to 12000 mAh now but it would have way too bulky. I normally charge the packs on an external charger for speed although I do have it charge with the unit at times.

[Q] What kind of battery life could I expect under minimal use?

I'm currently using an old LG Ally, and its age is getting to me. ARMv6 means developers are loathe to support it, 128mb of RAM is a tight fit, Froyo has its myriad limitations, there's no unofficial support for the phone anymore, etc. It was a good phone, for the price, but its heyday has passed, and I need more power for when I occasionally need entertainment whilst out and about.
So, after looking at the available choices (of which there are sadly few when a physical keyboard is a requirement), I'm thinking about grabbing a Droid 4 off a certain auction site, to replace my Ally. One major concern I have, though, is battery life; particularly while standing by. At the moment my Ally can easily standby with occasional usage nearly a week without needing a charge, with the following conditions true:
Gtalk and Checkin nonsense disabled
Auto-brightness customized to only provide needed brightness (e.g. not instantly blaring to 100% in normal lighting conditions)
Data connections off/voice only, GPS off most of the time
Minimal background apps
Of course, extended use of the screen or anything utilizing partial wakelocks tends to cut that time significantly, but time in-use compared to standing by, the phone spends far more time standing by.
So. Given the above usage and applicable settings, how long could I reasonably expect the Droid 4's battery to last? Would I actually be downgrading in terms of time between charges, like some of what I've read suggests?

Don't really know, over 24 hours, if running stock ROM or a modified stock with all unused apps disabled.
If I remember correct I got a several days, when I had forgotten it was on, but was not activated on a carrier.
Sent from my Amazon OtterX using Tapatalk

Hmm. On the Ally, the primary power draw is the screen, with the awake cpu and wifi coming in second and third respectively. Are the main draws the same on the d4, or is the power inefficiency coming from somewhere else?

Just look at the specs
http://www.phonearena.com/phones/LG-Ally_id4498
http://www.phonearena.com/phones/Motorola-DROID-4_id6431
Specs Ally / Droid 4
Battery: 1500 mAh / 1785 mAh
Processor:Single core, 600 MHz, ARM11/Dual core, 1200 MHz, ARM Cortex-A9
Talk time: 7.50 hours / 12.50 hours
Stand-by time: 20.8 days / 8.5 days
---------- Post added at 10:55 PM ---------- Previous post was at 10:46 PM ----------
The power inefficiency is coming from the 4 times faster processor and only 15% more battery.

I wouldn't think it would make that profound of a difference, though; the CPU should be offline for the majority of the time when the device is idling with the screen off.
I'd also assume that the 4x faster processor wouldn't use 4x or more the power, even with two cores, considering it's both newer (advancements in general processing efficiency can be assumed) and on a smaller process (45nm vs 65nm).
It's looking more like a problem of how it's used, rather than the hardware itself (though the battery is, as you point out, piddly for the device specs it's running). I'm tempted to pick one up now just to see how long I can get it to last.
I'd noticed the official standby time that you quoted before I started the thread, though, and considering those times are generally greatly inflated...it's a little worrying.

First I would disable all know safe to remove bloatware see
Disabled app/bloatware list
There are 71 apps in the list, some may require rooting to remove/disable
or
try a modified stock rom like
[ROM]D4 stock De-Odexed JB 98.72.18

Wow, 71. That's an exceptional amount of garbage.
I probably would have gone and used CM 10/11 or a ROM based on them, is CM not stable enough to use over a stock derivative on this phone?

Cm does not get as good of battery life as stock jellybean
Sent from my DROIDX using Tapatalk

Ah, I see. Modified stock it is, then.
Guess I'll look into picking a d4 up to play with. Thank you for the information and your time.

if it helps you get a general idea (using the extended gold battery) i can probably get a day and a half of stand by time and i always have LTE enabled. this is using CM11. you can probably get 2 days or so if youre not using data but dont take my word for it. the screen has been the biggest battery hog for me and i keep my brightness at 10%~ most of the time. i highly recommend you look into an extended battery because the stock is pretty weak. the gold extended one is around 15 dollars while the mugen is 90~? dollars but mugens battery is way better with the only drawback being its massive size which can be a benefit to some people depending on how you plan to use the phone

I have everything "enabled". WiFi, Bluetooth, GPS, 4G. In short: My phone is running at maximum potential. With that being said... on Standby, it lasts about 24 hours. ~4 hours with the screen on and the phone actually being used.
You don't really notice it if you're like me and never use the damned thing, but I'd suggest grabbing an external battery, if you can. It's definitely an upgrade from the LG Ally. I used to have that phone, myself...

Thanks for the replies, guys. I've actually bought a D4 and am currently waiting while the seller takes their sweet time getting it into the mail. Pretty eager to get my hands on it, it's been a while since I've had some new (well, to me) tech to play with.
Jishkah said:
I have everything "enabled". WiFi, Bluetooth, GPS, 4G. In short: My phone is running at maximum potential. With that being said... on Standby, it lasts about 24 hours. ~4 hours with the screen on and the phone actually being used.
Click to expand...
Click to collapse
What ROM do you use?
The lack of screen-on time really doesn't surprise me...the whole TFT display/fairly quick processor/small battery combination and all, and the assorted radios take a fair chunk. Still, it doesn't bother me all that much, as I'm already used to the Ally's fairly mediocre screen-on life. Quite the contrary, really; if I can get the same life out of it at much greater performance levels, I'll be pretty satisfied.
Puppymang said:
if it helps you get a general idea (using the extended gold battery) i can probably get a day and a half of stand by time and i always have LTE enabled. this is using CM11. you can probably get 2 days or so if youre not using data but dont take my word for it. the screen has been the biggest battery hog for me and i keep my brightness at 10%~ most of the time. i highly recommend you look into an extended battery because the stock is pretty weak. the gold extended one is around 15 dollars while the mugen is 90~? dollars but mugens battery is way better with the only drawback being its massive size which can be a benefit to some people depending on how you plan to use the phone
Click to expand...
Click to collapse
Hmm, not terrible, but not especially good either considering the below. I have a few ideas to try for stretching the battery out, and am planning on trying both modified stock and various CM flavors, so we'll see.
Are you talking about this battery?
I was under the impression that any battery larger than stock would need a different backplate to fit (though to be quite honest, without handling the phone I haven't gotten much of an impression as to the various dimensions of it)...if that's not the case, I'll definitely look into grabbing the gold battery.
Just how much room is left with it installed? Is there still enough room to, say, slip an inductive charging receiver in there?

Septfox said:
Are you talking about this battery?
I was under the impression that any battery larger than stock would need a different backplate to fit (though to be quite honest, without handling the phone I haven't gotten much of an impression as to the various dimensions of it)...if that's not the case, I'll definitely look into grabbing the gold battery.
Just how much room is left with it installed? Is there still enough room to, say, slip an inductive charging receiver in there?
Click to expand...
Click to collapse
That battery is same physical size as stock, just rated higher.
Sent from my XT894 using Tapatalk

sd_shadow said:
That battery is same physical size as stock, just rated higher.
Click to expand...
Click to collapse
...how?
Maybe I'm just having one of those moments here, but the last I was aware of, there was a fairly consistent relationship between capacity and size/weight when it comes to li-ion batteries. I don't see how they could possibly be getting 50%+ more capacity out of the same footprint without utilizing recent advances in anode construction (unlikely) or using li-po and utilizing wasted space in the casing (not advertised as such, and a third or so of the casing being empty seems unlikely). nevermind, I thought the D4 was using a traditional plastic-encased li-ion.
I hate to call BS on something another member is apparently having some success with, but it doesn't seem possible :\

as stated by sd_shadow its the same size as the stock battery but keep in mind that the gold battery does not come with the sticky glue that holds it against the phone and in my case the backplate is fairly easy to come off and i dont think its very good for the battery to be hanging from the flex cable thats screwed into the phone.
the 99 dollar one by mugen power is way bigger and they provide the modified backplate with the battery so you dont have to worry about that unless you plan on getting clothes for your phone
if you get the official wireless charging backplate then you will not be able to use any clothes on your phone because its thicker than the stock one.

Ehh, problem being that I'm not really interested in spending another $100 for a battery on a phone that can be had for around $30-$40 used.
I'm hoping to work out some way to quickly swap batteries, so I can just carry a spare with me. I like to think I'm decently crafty, and I have way too much time on my hands these days, so...we'll see once I eventually get my hands on it.
Puppymang said:
if you get the official wireless charging backplate then you will not be able to use any clothes on your phone because its thicker than the stock one.
Click to expand...
Click to collapse
I don't generally put anything on my phones anyway, aside from the mandatory Skinomi screen film. Regardless, what I had in mind was doing this, possibly reworked to add poppable connectors instead of hard-soldered connections.
Not really interested in overpaying for Motorola's monstrosity of a solution when there's a much more elegant option available.

there isnt really an easy way to have a backup battery on the droid 4 thats easy to swap unlike say droid 3 where you can easily pop the cover off and swap batteries. the battery on droid 4 is screwed in by 2 small screws and if you lose em your phone probably wont work until you get replacement screws
i had to make a battery change this weekend because i carry my stock battery along with the screw with me just in case and its honestly a pain unless youre in a well lit room with a table
your best bet might be to get a portable usb charger that would be usable for other devices as well. i have no experience with them but it seems a lot more comfortable than asking someone to hold a flashlight while you change the screws.
but keep in mind that if youre just listening to music you can expect the device to last about a day so needing another battery might not be for you

Puppymang said:
the battery on droid 4 is screwed in by 2 small screws and if you lose em your phone probably wont work until you get replacement screws
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Wondering about that, actually. From what I've seen, all the screws do is press the ribbon cable down onto the ubiquitous springy interface pins, right? Plastic-encased batteries (like, for instance, my Ally's) provide the pressure with their weight and rigidity, rather than baffling design decisions like...well, a separate ribbon cable.
Though we don't have a particularly rigid battery to work with, it shouldn't be too hard to figure out a way to provide pressure to the pins without using screws. How solid is the battery door when it's locked in place?
I don't anticipate actually needing to be able to swap batteries on the go; after all, I thought I'd need to with the Ally but eventually tweaked it to standby properly - but figuring out if and how it can be done sounds like a fun exercise.

on a previous post i said that my back cover is fairly quick to slide off but i cant speak for others as my phone is from ebay. its supposed to be refurbished and the back cover was new but its still pretty bendable
the battery is held inside mainly by the glue and the screws. there is room for the battery to wiggle around if it doesnt have the glue which is what happens with the gold battery. if you remove the backplate and make the battery face the ground then its only gonna be held by the flex cable that doesnt stretch so its not something i advice. when i use the gold battery im very careful to never let this happen
the contact pins are held down by 2 screws and theyre covered by a small plastic piece thats pretty easy to remove by hand
if you think you can work something out than congrats but this is the biggest design flaw droid 4 has in my opinion

Puppymang said:
on a previous post i said that my back cover is fairly quick to slide off but i cant speak for others as my phone is from ebay. its supposed to be refurbished and the back cover was new but its still pretty bendable
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Yea, I saw that. I was referring more to its front-back/vertical strength, whether it could handle holding something against the battery pins.
Bendiness would be a problem, though.
Fortunately, what I have in mind shouldn't involve the back cover at all.
Puppymang said:
there is room for the battery to wiggle around if it doesnt have the glue which is what happens with the gold battery
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How much vertical wiggle space are we talking about here?
Reason I ask is, I've been looking into batteries for similarly-sized phones. The Optimus F5's battery dimensions look promising, and it's apparently either a 2150mAh or 2460mAh part (this comparison page says 2150 for OEM, but I can't seem to find such on ebay).
Both sets of dimensions are from "gold" battery listings, for consistency:
Droid 4: (7 x 4.8 x 0.4)cm / (2.76 x 1.89 x 0.16)" (L x W x H)
Optimus F5: (6.5 x 4.4 x 0.5)cm / (2.56 x 1.73 x 0.2)"
Slightly smaller, but 0.1cm/0.04" thicker. Is there enough room?