Hi,
I came across this cab file today for the Kaiser http://forum.xda-developers.com/showpost.php?p=2132767&postcount=151
its right said:
ok guys, some of you want to increase the battery life, i attached a cab file which contains these registries:
[HKEY_LOCAL_MACHINE\Comm\L2TP1\Parms]
"DisablePowerManagement"=dword:0
[HKEY_LOCAL_MACHINE\Comm\Irsir1\Parms]
"DisablePowerManagement"=dword:0
[HKEY_LOCAL_MACHINE\Comm\AsyncMac1\Parms]
"DisablePowerManagement"=dword:0
[HKEY_LOCAL_MACHINE\Comm\PPTP1\Parms]
"DisablePowerManagement"=dword:0
[HKEY_LOCAL_MACHINE\Comm\L2TP1\Parms]
"DisablePowerManagement"=dword:0
all of these can improve the battery life, but if you face any issues with WiFi, just check these registries .
enjoy.
Click to expand...
Click to collapse
Has this been used in preference to, or in conjuction with the cab found here
http://forum.xda-developers.com/showpost.php?p=1351827&postcount=6
Power Saving.cab
sd-battery-save.cab
I have spent about an hour trolling through all sorts of posts and would like any feedback on what is recommended.
Thanks in advance.
anyone have any comments? surely im not the only one trying to get a full day out of the stock battery.
This is the best hack out there.
http://cgi.ebay.com/AT-T-TILT-8925-...s?hash=item1c05a465c2&_trksid=p3286.m20.l1116
if I not wrong, sp call battery hack ..it not really hack to battery, It only reduce the phone keep searching the network (which consume a lot battery ...according to some forum).
I think this one better ..2800mah ...
http://www.lelong.com.my/Auc/List/2...00-110-120-O2-XDA-Stellar-2800mAh-Battery.htm
My phone will last about 3 days by measurement if I'm not running Flexmail with two mailboxes online. Otherwise, 14 hours.
Want a full day out of your Tilt? Limit network activities, or interactive activities, and don't use the GPS. Network, backlight, and GPS are probably the biggest power users on the Tilt. I assume WiFi too, but the only thing I've used WiFi on my Tilt is for scanning for open access points.
Sorry bumping thread couple of months old....
I've got a Kaiser HTC TyTN II and my battery is a shame.... i can't get it until the end of the day, always getting empty at the end of the day....
What can i do to improve the battery life time?
I've installed those cabs, but nothing really happens....
My phone idle during the night takes like 20-25% of the total battery.
I just use my phone to make and receive calls (lot of them), and sometimes the bluetooth when staying at the car.
Some time ago i ordered a 2800mah battery, but i really don't want to carry always a replacement battery with me, besides its really heavy and big....
Thank you for you advices.
xpgo said:
Sorry bumping thread couple of months old....
I've got a Kaiser HTC TyTN II and my battery is a shame.... i can't get it until the end of the day, always getting empty at the end of the day....
What can i do to improve the battery life time?
I've installed those cabs, but nothing really happens....
My phone idle during the night takes like 20-25% of the total battery.
I just use my phone to make and receive calls (lot of them), and sometimes the bluetooth when staying at the car.
Some time ago i ordered a 2800mah battery, but i really don't want to carry always a replacement battery with me, besides its really heavy and big....
Thank you for you advices.
Click to expand...
Click to collapse
There's an old saying begars can't be choosers... Kinda makes sense you want better battery life yet you want to stick to stock battery.
Ummmm? Buy a OEM new stock battery if the size of 2800 is too much? To be honest the Tilt is a brick anyway so i'm happy to have aprx 1cm added to the base... Also maybe time to try all the Radio's available to see if you can get better battery life, while @ it hard-reset device to start from fresh
Related
I've been researching this phone and I really like it so far, but I have a question about the battery.
I've read about the battery lasting something like 9 hours or so.. now my question is that 9 hours while constantly in use?
For example if I leave my house at 3:00 PM with a full charge hang out with my friends, end up at a bar at night, and I maybe talk for 20 minutes, send 5 txt messages and barely mess with the phone, will the phone dying around Midnight?
With that type of light usage it can last a day or even two deopending on how you config. & the radio you use.
The +or- 6-8 hours is with wifi, BT, 3g data usage, gps, etc...
I make it about half the day(5-6 hours), but I've got AgileMobile running all day using 3G connection so I'm assuming I'm running normally. This is greatly improved by switching off 3G(adds another 2-3 hours). I put maybe 15-30 minutes of calls on my phone a day, it's mostly a mobile web browser and instant messenger.
To get through a full day for me I charge the phone in my jeep while driving to / from work, and most days I eat lunch out so I charge it then as well.
Thanks for the replies. I will probably have all data connections turned off, and won't run GPS on days like that.
I really dig this phone, I just got a little worried about the chance that I won't go home after some heavy drinking and won't have a phone to use in the morning...
Also, I just read on a website review from Laptopmag.com that said "We left a fully charged Tilt on over a long weekend, and when we returned, the unit still had three out of four bars of battery life"... What do you think?
Well I think if you upgrade to wm6.1, you should gt alot better battery life.
I was sick (in bed most of the day) yesterday so I took my phone off charge at about 7am in the morning.
I sent some messages, surfed the internet with hsdpa for about 3 hours (and this is in a bad signal area, which means more battery consumption)
then did some wifi (20mins)
and a bluetooth recieve or two.
I just checked the battery level this morning (8am) and I still had 57% left. I was abit surprised because I thought it will have drained by now like it did with wm6. The point is wm6.1 has a lot better battery life. So for maxumum battery life you should upgrade.
Just my 2 cents
Battery life...
Hi I have had the kaiser for not long really... there's a neat program that tells you what is the drain, of the battery...
well if you are not touching it and not doing anything it drains about 6-10ma, so based on that yes, it can last for a looooooooong time, now when you call it goes to 200-400ma, so yes it drains more battery there. ( as you would think it would )
then again you can have the backlight to low, to use less battery, also, turn the screen off when not using it, and change the radio an a lot of hacks.
based on my experience using EDGE, the GPS, the screen, playing a game, sending some mms, and talking, it can really kill your battery in no time.
but you can also well get a car charger ( be carefull with those ) or a better battery, because to be realistic the one that comes default really sucks...
I have seen people talking about a 3000mah battery so that could really drive the phone for a loooooooong time, better think about other issues, like how sucky the camera is... ( maybe with the video drivers we are wating for this will get fixed ), also well, sometimes the performance is not that good, ( also video drivers I think ), besides that, and if you don't mind like I do, to have to wait for a few seconds to get things going on, the phone is a real jewel, if you live life in the fast lane, well maybe that second to open the keyboard will kill you
TC !
chuby007 said:
or a better battery, because to be realistic the one that comes default really sucks...
Click to expand...
Click to collapse
which one do u recommend? also where can u find this battery?
thanks
^^
Seidio 1650 battery and the Mugen 1500 batteries seem to be good oem size batteries from I have read. THere is a thread on the Kaiser Accessories board about batteries.......
I had a similar experience with excessive current consumption in standby, likely caused by the GPS though it is off (see Post "TyTN II / Kaiser issue: GPS & battery drain").
Perhaps you should install "BatteryStatus". Make yourself familiar with the battery current display, and try to figure out how much power your device draws.
Another nice test is, switch all units off (phone, WLAN, Bluetooth, GPS, really everything). Make sure no program is running (TaskManager). Leave the fully charged phone alone for 5 hours or so. Recheck the battery capacity whether it dropped more than very few percent. If you do not need GPS frequently, you may simply try a soft reset. If you have interesting results, please be so kind and add them to the abovementioned thread, too.
BusterTyTN
Hi all,
After 2 days of testing this tweak, I have booked really good results with my Diamond.
The phone has been on and not connected to charger or computer for over 48 hours now, and the battery has dropped only to 50%. That's right, two full days and nights of stand-by time, with an occasional call here and there, a couple of text messages, and reading some email.
Before this tweak I had to charge the Diamond already after 24 hours or less.
So if you have low battery life problems, give this a go:
Advanced config tools -> disable the setting "GPRS auto attach"
Read about this setting here: http://forum.xda-developers.com/showthread.php?t=395301&highlight=GPRS+auto+attach
Have fun and enjoy the longer battery life
But this has been discussed already and is only any good if you don't rely on GPRS a lot throughout the day surely? I mean I use Exchange and I'm sure it wouldn't work for me if I tweaked this setting.
Works great if you dont use the phone all that much but doesnt make much of a difference if you do make calls, send and receive sms texts..email send and receive etc etc.
Ive enabled that tweak and i still find the battery to be utterly rubbish for a phone of this power. Sure it helps conserve some of the battery but i can guarantee you that by 7pm tonight my phone will be dead...like it happened to me yesterday...went to work yesterday battery was 100%...made 3-4 calls...in total spent about 30 mins on the phone...browsed the internet for about 20 mins...sent and received 30 texts...watched a few youtube vids...checked my email a few times...not really heavy usage but by 7pm my phone was dead.
Not impressed with HTC and their monumental screw up with this battery..900mah is just not enough for this device if you want to use it properly that is. You would have thought they would have learned from Nokia when they first released their N95, that had a terrible battery on it as well...although with the n95 8gb the battery is much much better. Why they felt it only needed 900mah is quite beyond me...plus the battery gets hot which proves to me that the battery is not up to the job imo. Luckily the phone is good or else id have sent it back by now...guess ill have to wait for the extended battery to make an appearance. In fact i find the battery so rubbish that ive had to order a spare usb synch cable so i can charge my phone here at work.
Guys, if you want to substantially improve your battery life, go with a newer 1.37 ROM.
The older 1.35 ROM has serious battery life problems, there isn't much you can do about it without to cripple full functionality.
Where can i get the 1.37 ROM?
It isn't available in the e-club on htc.com
It's linked in the Diamond ROM Development forum.
You need to install the developer version of the HardSPL first, then install one of the 1.37 roms - I'm using the official HTC HK-English one with the 1.37.707.1 rom in it.
Works a treat for me - though I haven't had it on long enough to test battery time extensively yet.
I'm on the 1.37 rom, was on the 1.34 with my first unit and the battery is much better. I'm also noticing that the battery improves with 'age'. Plus I've got the dock on the way when it's released so that will help things no end I'm sure. When I'm in the car I shove a normal mini usb cable in from my Sony CD player and of course the upside of that is it will also play my music too instead of using USB drives. At work I use a spare USB and plug it in.
The battery is poo but having worked it in to a routine like that I hardly notice it now.
Unhooked my Diamond last night 22.00-ish from the usb cable and while I am typing now the battery is still more than 80% charged.
Texted alot today, called approx. 30 mins, checked my e-mail several times and played around with google maps for 20 minutes or so.
I did not tweak anything except that I flashed the 1.37 ROM and installed the newest Google-maps thingy.
So I can confirm that the new ROM saves alot of energy and that the battery-life gets better in time sounds also plausible.
With the 1.35 ROM the battery lasted 12 hours max with the same activities.
I've found that after a few days the battery is actually better than it was wen new. Must be that charge/discharging it a few times has helped...
R
Spawn12 said:
Ive enabled that tweak and i still find the battery to be utterly rubbish for a phone of this power. Sure it helps conserve some of the battery but i can guarantee you that by 7pm tonight my phone will be dead...like it happened to me yesterday...went to work yesterday battery was 100%...made 3-4 calls...in total spent about 30 mins on the phone...browsed the internet for about 20 mins...sent and received 30 texts...watched a few youtube vids...checked my email a few times...not really heavy usage but by 7pm my phone was dead.
Click to expand...
Click to collapse
actually I find your usage is a lot. during the day i will make one or two phone calls say 10 minutes. send an average of 5 sms texts and maybe check my email for a minute or 3. what takes most of my battery is when i read an ebook or do a game.
sandervanzijl said:
actually I find your usage is a lot. during the day i will make one or two phone calls say 10 minutes. send an average of 5 sms texts and maybe check my email for a minute or 3. what takes most of my battery is when i read an ebook or do a game.
Click to expand...
Click to collapse
Maybe it is but for me i dont think its that high...as i said my nokia n95 8gb would last a good day or 2 before going completely dead and thats with the sort of usage that i described earlier. Anyways i have a synch cable coming which ill keep at work to charge the Diamond.
hey battery life is better after this tweak. but my 3g logo has changed... it's now in some greyish box... anyone know what this means?
I think this means that the network knows it's available but you haven't attached to the data service. I used to get a similar greying out of the globe icon on my P1i if the net knew it was there but I had unattached manually.
Hi i am novice with my HTC touch diamond & i am also facing the same problem of battery life.
you've shown some solution over there in your post. please, can you tell me where in my phone i need to go to apply this settings.
hank you
Right then,
I am a n00b here, and am expecting a bunch of 'search for it' responses that seem common in my reading of the forum over the past day or so. I have tried all of the tweaks recommended and still suffer from poor battery life. Today for example, day 4 of having the phone, and having been charged approximately 6 times during that time, the phone has only 2 green 'bars' of power left after only 8 hours of being on. During that time I have made no phone calls, and sent/received about 8 sms messages.
Anyone have any ideas or similar problems? I understand that this phone suffers from limited battery power, but mine seems particularly bad.
Thanks anyone who can help.
could be a bad battery?
I improved mine by disabling the GPRS auto-attach (massive saving) and truning off wifi using comm manager when not using it but by the sound of it you have tried these...
Mine lasts a few days now.
I also got good results from Bepe's and TDP's ROMs but it's probably nad to flash if you are thinking of sending it back as faulty...
Yes, also as a 'n00b' I'm not too confident flashing it just yet. The battery does get hot during charging, something others say doesn't happen. I think it may be a faulty battery. I have turned off the auto-attach and also wifi, as well as any other tweaks that were mentioned on here regarding battery life. Nothing seems to be working. Anyone else have any input? Thanks.
Same problem here.
I also flashed it with TLR ROM... but the problem is the same and very annoying.
I use it in a very normal way without any strange usages.
For me the battery resists only 75% of the day... and it is terrible!!!
I tried also with the minumum of brightness.... but you can't use it like this all the time!!!
Any suggestions??
Thnx!!
I am thinking of phoning Orange (who I got the phone from) and asking for their help. I think I might have to send the phone back which I really don't want to do. I hope they might just ship me a replacement battery.
wow. u get 4 hours? mines more like 2 hours. im on my 2nd diamond with the same results. i tried all the different roms also. u are not alone. my fix was going back to using my old touch.
You should flash a new rom..I recommend you shep's new rom and get radio 1.12.25.19 with matched rilphone2.dll..your diamond will stop suffering from battery draining.
evilskanker said:
Right then,
I am a n00b here, and am expecting a bunch of 'search for it' responses that seem common in my reading of the forum over the past day or so. I have tried all of the tweaks recommended and still suffer from poor battery life.
Click to expand...
Click to collapse
Just in case you haven't tried all tweaks and tips yet, have a look at this Battery Conservation Fanatic thread.
If the battery is OK, you should try with a new rom. I had the same problem: my Diamond were with Vodafone default ROM and the battery lasted half a day... now with a cooked ROM, the battery lasts near two days.
Good luck!
900 mAh is btw way too small for such a phone, I recommend you to get a new rom/new battery. I'm waiting soooo much on my new 1800 mAh battery........
Hi all,
I'm currently the proud (and quite satisfied) owner of an HTC Artemis. The only problem is that the phone keeps hanging more often lately. I think the end of it's lifetime is approaching...
So I'm lokking for another phone. My demands are: GPS & wifi. I'm not looking for a photo-camera that can call, I've got a digital camera for taking photo's. Google told me that the Diamond was the phone for me (I'm very much into graphical stuff, and the g-sensor is just the bomb!). However, when google-ing i've read about 2 issues. I'd like to get your opinions on these:
1. Reception
This is an issue I've found only very little reference to, so it might not be an actual problem. I've read that the reception on the diamond is quite low. I've read that a tester couldn't reach a reception of 5 out of 5 bars, no matter how close or far he was from the GSM-tower. The best he got was 3 bars out of 5. Is this an exception or do you also have this problem?
2. Battery life
OK, this one I've read a lot about. I've read about people whose Diamond gave up after 5 hours just in standby, but I've also read about people who use their Diamond "normally" (thats a very vague term) and who can do that for about 3 days without recharging the battery.
What about your Diamonds. What do you use them for (and how often), and how long does your battery last?
Are there perhaps tweaks that can help to lengthen the battery-life (can 3G be switched off for example, I think that is one of the main power-drains, right?)
Of course, if you have another phone I've missed in my Google-tour, feel free to mention it!
1, I live out in the sticks in the UK and can get full signal on the Orange network without any problems. The 2G and 3G signals are pretty much identical to what I got on my old Tytn so from my experience the reception is not a problem.
2, I've read a lot about the battery life being rubbish on the diamond. I charge overnight every night, but the remaining power at the end of the day is pretty much always more than what I had on my Tytn.
I probably use it for the following daily:
20 mins phone calls
a bit of playing around with GPS but nothing much
up to around 30 mins wifi
data connection usually on all day
an hour or so playing around with the phone apps
at weekends I poll my IMAP server every 15 mins and it doesn't make a lot of difference to the battery.
Right now, it's about an hour before I'll go to bed and I'm still on 50% battery so I don't see much problem with the life. I know it's a lot lower than non pda phones, but if I had a normal phone I'd only be using it for calls from the above list
Reception for me is a little less than my TyTn, but not enough to worry about.
Battery was terrible at first, but has settled down now. I don't think people realise that they probably thrash the battery for the first week or so playing around getting to know the device. Usually I have about 50% charge left after 18 hours so if turned it off at night I could squeeze two days from the phone without charging. Usage wise, pretty much the same as StarMonkey but I browse in Opera for about an hour a day, not with WiFi though.
Battery life might bother some, but if you've had a TyTn or another Smartphone you'll be used to charging more or less every night. This one's no different.
Thanks for your opinions! anybody else who wants to share his or her experience?
derinahon said:
Battery life might bother some, but if you've had a TyTn or another Smartphone you'll be used to charging more or less every night. This one's no different.
Click to expand...
Click to collapse
As I said, I have an Artemis right now, and I need to recharge twice a week. I don't use bluetooth, and I turn off Wifi or GPRS when I'm not using it. I think that helps with battery-life.
I have no problem with the signal but the battery is much worse than with my Artemis or tytn II. I use tom tom a lot and get 2 hours max on the diamond. Where my Artemis and tytn was over 4 hours. But extra batteries are cheap enough on e-bay.
Hi Guys
I work in the IT dept of my company and ive got the job of supporting all our WM devices. (97% of them are the HTC Tytn II/Kaiser)
i get moaned at alot about this things and the main thing is the battery life is p*ss poor! All they run is active sync to pull in emails as they arrive and then the usual phone call, but yet the battery still wont last a day.
Does anyone know of any tricks or tweaks i can do on the devices to make them squeeze out every last drop of battery life?
cheers
Yeah, if you can get Advanced Config installed on their phones, fire it up, go to the right soft-key "Menu" option, and in there should be a Comm Manager selection. Pick it, and in the panel that comes up check on teh 3G button. Then, close out of Advanced Config and let it reset the phone. When the phone comes back up, go into the Comm Manager and there will be a new button to turn 3G on and off. Turn it off. If all they're doing is phone calls and pulling down emails, the Edge connection should be more than sufficient. I've also noticed improved battery life by leaving bluetooth turned on all the time (I now it's counterintuitive and could be a placebo effect, but I swear it makes a difference for me.) I can get well over 2 days on Edge connection with the stock battery using these 2 tricks.
splash08 said:
Hi Guys
I work in the IT dept of my company and ive got the job of supporting all our WM devices. (97% of them are the HTC Tytn II/Kaiser)
i get moaned at alot about this things and the main thing is the battery life is p*ss poor! All they run is active sync to pull in emails as they arrive and then the usual phone call, but yet the battery still wont last a day.
Does anyone know of any tricks or tweaks i can do on the devices to make them squeeze out every last drop of battery life?
cheers
Click to expand...
Click to collapse
If they don't have them already, you may want to have car chargers installed in the company cars of those with TyTN IIs. As for settings yes disabling HSDPA or even better going back to just plain GSM rather than 3G will help battery life (although also slow down any internet connectivity). You could also try turning down the screen brightness as this has a major effect on battery life but then they'll probably all complain the device has p*ss poor screen visibility (especially in bright sunshine - so if you're in the UK this won't be an issue )
If these suggestions don't work then I think the best plan will be to make it as easy as possible for them to top up charge during the day, perhaps with desktop cradles as well if this would encourage charging. I sometimes need more than one battery charge in more than a day (I've even used up all of my spare battery charge as well on a day involving lots of GPS navigation on foot) so yes these things do normally use lots of battery power if you have all the bells and whistles running and no charging occuring. Make sure wifi is left off on the TyTN IIs unless it's actively being used at the time.
Which ROMs are they using - all HTC official? There are reported differences in battery consumption depending on the ROM version used.
cheers for that guys
I will give both of your suggestions ago, next time i get one of the tytns in front of me.
I have the advanced config for the HTC diamond would that work on the tytn? if not where would i get that from?
Is it just me or are we being left with the sour taste of "Why should we have to compromise on the performance of the device to get 2 days battery life out of it?"
Unfortunately " push " email kills an already suspect battery. Activesync and your media net ?, edge? or 3G remains connected all the time . I had to go from " when they arrive" to " check every 30 minutes " for email or else my battery , even with minimal use would not last past 5pm.
I really miss my Blakberry in this respect. My Tilt does everything and everything for me, and does so on battery power. I guess if it just made phone calls the battery would last for days.
i agree denco, all the HTC WM devices ive ever had, they've had a load of functions but the battery is all very weak! whether or not that is something to do with HTC or WM i dont know, but its very annoying and just something we have to live with as my company signed a 2 year contract with Orange in March so there is nothing we can do!
Well, I doubt that it is Windows Mobile; ok, to be correct: WM has gotten more powerful with each new version, got even more and more graphical additions, just like Vista compared to XP. For sure this needs much more horse power and, in fact, processor and RAM are increasing. However, HTC barely increases battery capacy as well - might it be because of size / weight proportion or other reasons - I don't know!
I had the MWg Zinc II for a while and the battery life (1500mAh capacy) was amazing. However, audio / network reception quality was a joke on that thing.
Thankfully, there are HIGH CAPACY and EXTENDED BATTERIES available for the HTC's. They make your device look funny but surely increase your battery life as well.
I am (still) willing to sacrifice battery life for quality; arranging my life by having a car charger and also a 2nd battery with me when on the go. Hopefully HTC's batteries will evolve and have higher capacy in future devices.
Kaiser battery life
I am not an expert at this. I also was unable to keep a battery operational for half a day until I did a hard reset, and brought it back to stock ATT 6.1. Then used the phone without email for a day and noted no excessive battery drain. (70% at end of the day) Kaiser tweak added, with the “Disconnect after” parameter in the Data (GPRS/EDGE/HSDPA/WIFI) set to 1 min. Added the MS Push to my Exchange server, and only use the single email account. No appreciable battery drain. (68% at end of day)
The only thing I have NOT enabled yet is the ATT Navigator. Will add Google Maps and see if it messes with GPS chip. I have read and experienced the GPS draining my battery, even after turning it off, within a couple of hours.
splash08 said:
cheers for that guys
I will give both of your suggestions ago, next time i get one of the tytns in front of me.
I have the advanced config for the HTC diamond would that work on the tytn? if not where would i get that from?
Click to expand...
Click to collapse
In the advanced config, there are also settings for "Power management", make sure there is enabled in all of them.
Starfury said:
Is it just me or are we being left with the sour taste of "Why should we have to compromise on the performance of the device to get 2 days battery life out of it?"
Click to expand...
Click to collapse
Nah, considering the EEEpc I have gets about 2 hours battery max, and I can do a stack load more on the TyTnII than on the laptop, I', pretty happy. I had aan old Nokia that would go for 2 weeks without charging, but for a high end, gps enabled windows phone, 2 days is amazing.
@ splash08 : you can also try upgrading to the new 1.70 radio found in the kaiser rom thread, seems to give me less drain. Also, you can buy larger capacity 3rd party batteries.. maybe thats the best soultion.
GPS (Telenav) causing my battery drain
Since my last post on the 27th, I have had ZERO problems until I used the Telenav on Friday evening the 5th. Since then can only get about 4 hours out of the battery before it drains completly and that is with ZERO use. I have uninstalled Telenav and done multiple power down, but stilll draining. Looking for a way to turn off the GPS before I do a hard reset.
GPS had no issues with google maps and no battery problems.
ive now tried all those suggestions but non have really made a dramatic increase. I thought i cracked it at one point, over a weekend my phone last from saturday all the way though to monday night! but then i realised that saturday and sunday is off peak so the push/pull function was set to every 60mins! As soon as i got back to work during the week the device would last just over one day, on emails only.
i think i may have to look into getting the extended batteries or maybe changing all the devices for a none HTC device, as they seem to have a weak batteries (but i think this may be the last resort at it will cost a lot ot change all the devices)