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Charging speed

To power up, you consume Red Bull. But your phone just needs its adaptive fast charger. Rate this thread to express how quickly the Xiaomi Poco F2 Pro (Redmi K30 Pro) can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!

With the supplied charger and cable the charging time is very impressive ("Turbo Charge") with a normal QC3.0 charger charge time is still very good but comparable to most other QC3.0 devices.
Something to note is the device does get noticeably warm when using the supplied charger in the "Turbo Charge" mode.

Takes about an hour for me with included charger.

murakh said:
With the supplied charger and cable the charging time is very impressive ("Turbo Charge") with a normal QC3.0 charger charge time is still very good but comparable to most other QC3.0 devices.
Something to note is the device does get noticeably warm when using the supplied charger in the "Turbo Charge" mode.
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yes i noticed it get warm to hot-ish
isn't that bad for the battery?
moreover i noticed that if you charge while turned off it does not get hot

itti_sam said:
yes i noticed it get warm to hot-ish
isn't that bad for the battery?
moreover i noticed that if you charge while turned off it does not get hot
Click to expand...
Click to collapse
That's normal because you're not using it, if using while charging it will be hot as your running apps, tasks etc... at the same time. This will increase the heat as sensors will be running also.

Has anyone tried to use other cables that has the same turbo charge effect like the included cable? The included cable is too short, usually I use 2 meters long cable.
I have tried the baseus 5A 40W cable but it only support quick charging and not turbo.

I've tested charging wattage using original 33W charger and original USB cable via specialized USB tester, and I noticed it provides only 25W (about 9.6V/2.65A). It shows "Turbo Charge" indeed, but it's still only 75% efficient. Anyone care to explain this? Is this normal? I've read that only Zoom edition can be charged at 33W, so I expected non-Zoom edition will charge at least with 30W. I tried two other USB cables, and still only 25W. Later today I will try to charge it with Blitzwolf 30W PD charger and see how it goes with that one...

I haven't really tested charge speeds. So far the battery life has been exceptional and the main reason I opted for this phone without the high res screen and refresh rate, as see battery as more essential. I would much prefer charging at a slow speed to preserve battery life. A good app for this is AccuBattery. It measures how many mAh's being charged and discharged after each charge and keeps a graph. It will estimate battery health also.

Yeah I know about AccuBattery, I've been using it in the past. But a real physical tester device is always more precise. I do sw/hw development for a living so I know for a fact. Indeed, battery life is very good because optimized MIUI and pretty big battery, but it would be even better if charging speed was also up to the specs. Meanwhile I've tested charging speed using Blitzwolf 30W PD2.0 charger (K30Pro should support PD3.0 and be backward compatible), and situation is even worse - only about 15-16W at QC3.0 I believe. So no Turbo Charge was initiated. I mean 25W with original charger is still good, but I expected advertised charging speed. I'll do more tests when I catch some time.

Thats normal, because it don't charge all the time with 30W. Compare it with WARP Charge 30T it is faster. OnePlus 8 got 30W and 4300 mAh, F2 Pro is faster with bigger bettery but it's almost the same.
How old is your Blitzwolf charger?

I know it shouldn't charge @30W above 80-90%, but sure it should at 20-ish where I'm at about now. It's also not even cool to the touch, so there's no apparent reason to slow it to 25W. My Blitzwolf charger is about a year old, but I only used it couple of times, so it should be as good as new.

itti_sam said:
yes i noticed it get warm to hot-ish
isn't that bad for the battery?
moreover i noticed that if you charge while turned off it does not get hot
Click to expand...
Click to collapse
Batteries don't like heat but it is actively monitored and it will slow down charging when it crosses temperature threshold.

That's why I mentioned my phone is not even cool to the touch (let alone hot), so my case is not temperature related. I'll try to charge it while turned off, though it was pretty much in idle doing nothing when I did the test, ie. not stressed at all by any factor. All in all, I mean if everyone else gets 25W out of original charger, I won't bother anymore. Also, if it charges from 10-90% in around 1 hour, I won't waste any more time on this either, since it's good enough for me. I was just curious why it charges at 25W, when 30W (and 33W for Zoom edition) was advertised. Altough it wouldn't be the first time something was advertised at launch, and not achievable in real-case scenario.

Burs said:
I'll try to charge it while turned off...
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Click to collapse
Fun fact: phone doesn't charge when powered off?! That's a first. Is it just me, or am I getting too old? For the whole time I'm talking about my Redmi, not to confuse it with Poco, if that matters at all. Maybe Poco works differently.

On my Huawei device you also can not turn off an charge but this starts with Android 10.

takes about 1 hour and 20 minutes for me, I think the high temperature here, summer season, is the reason for this slow charging speed.

From 20-100% in about an hour. Few minutes less actually. Battery is big, that's all ok.

F2 turn off and are dead with 0% (can't turn on). Timer 60 min. and after 60 min. I got 96% with original charger. The phone don't turn on, like it always do.
@Burs a friend told me "on my Anker charger I only can use PD over the third usb port, with the type c port it will charge over QC 3.0 and not over PD" maybe thats why you get ~16W?

When my Redmi was turned off completey, it was hooked up to my USB tester for about a minute. I doubt it would trigger after some minutes, and only then start charging. For the whole time it was connected, I was getting 5V / 0.015A readings on the display. That's pretty much USB tester drawing the power from the phone battery, not the charger! So that would mean charging was completely disabled making the phone behave as a power bank lol. Weird enough, right?
My Blitzwolf charger has only two ports. One PD2.0 (USB-C) and one QC3.0 (USB-A). I've tried three sets of USB cables (one even 5A) on both ports, and best I could get out of it was about 15W. I think I'll have to order another one with PD3.0 and Turbo Charge compatibility.

Heh I'm planning on just using my old 1A slow chargers because they're dotted around the house and work, will probably not even plug fast charger in. Magnetic cables are just so convenient.

Question s21 ultra at 45w

i heard s21 ultra support 45w charging.
what are the chances that samsung give us REAL 45w charging this time
and charge 80% faster than 25w ?
would be nice to charge 50% in 15 minutes, full charge in 30 minutes.

I would assume that Samsung made the 45 watt charger for the upgraded quick charge capability on the S21. I am wondering myself if it will charge faster than my S20 Ultra.

S21 series has 25W max charging.

Virgo_Guy said:
S21 series has 25W max charging.
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Click to collapse
25 watt fast charging works well... save your money.

blackhawk said:
25 watt fast charging works well... save your money.
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Click to collapse
I had been eagerly waiting for long to waste some money on a faster charger that actually works unlike useless 45W in the S20U.
The year is 2021 as per other manufacturers.

blackhawk said:
25 watt fast charging works well... save your money.
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Click to collapse
this
also faster charging basically degrades your battery life faster

My oppo find x2 Pro, charges upto 100% in 36 minutes! I don't have to worry about charging at all....

historys said:
this
also faster charging basically degrades your battery life faster
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Click to collapse
I have the Samsung Note 10 Plus which supports 45W fast charging but disabled it in the settings because charging your phone slowly is of course better for your battery.
But it is those moments when I am in a hurry and I forgot to charge my phone, then it really comes in handy. All in all 25W is probably enough.
Dont forget that you need both a cable that supports 45W charging and a 45W charging adapter.

marvi0 said:
My oppo find x2 Pro, charges upto 100% in 36 minutes! I don't have to worry about charging at all....
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Click to collapse
Thats exactly whats killing your battery over time. I charge my device with 10W max over night, lower would be even better, cause you dont need the speed there. I also got a quick charger, but this is only used if im on the go and time is more important.

Virgo_Guy said:
S21 series has 25W max charging.
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That is the truth 45w was supported on last gen s21 series it's gone

I got the 25w charger for my s21u because I had enough points for it. It works well, does super fast charging but if you have another decent charger you don't need it.

Question Can we charge S21U with 40W chargers?

Hi to all,
Can we charge S21U with 40W chargers? They are a lot chargers like Huawei, Xiaomi and etc... with 40W and more.

I believe the answer is yes - or at least probably. Most of those newer chargers are "Smart" in that they only provide the volts and amps that are needed by the device being charged. I may be wrong about that, but I don't think so - I don't think you have anything to worry about.

isko01 said:
Hi to all,
Can we charge S21U with 40W chargers? They are a lot chargers like Huawei, Xiaomi and etc... with 40W and more.
Click to expand...
Click to collapse
Pretty sure you can, I use a 45 watt "smart" charger on my NOTE 20 Ultra without any issue.

You can use any charger that supports PD (power delivery), AFC or QC2.0
Any 45 watt USBC charger out there is going to be PD standard so you'll be fine.
The downside is, it'll still only charge at 25 watts.

I am charging my s21U with an 40w charger, works without problem. not using 40 watts of course, but its working.

The phone, all phones in fact, will ONLY charge at it's highest speed the phone allows itself to receive, the charger doesn't matter, it can be lower or higher than what the device is recommended for. A lower power charger will just take longer to charge the phone, a higher power charger will just not charge at it's full power if the phone won't accept the full power from the charger.
I've been using the 90w charger from my HP Spectre X360 my S20 Ultra since I got it without a single issue, I still get about 2 days of use per charge on that thing, and now I've been using the same laptop charger on the S21 Ultra and it works just fine.
The phone fast charges normally, doesn't get super hot, works just fine, and I only need to keep laptop chargers around the house, it's great haha

I have a 45W USB-C PD port as part of an Anker PowerPort and also the 18W charger that came with my Pixel 5. Would I notice much of an improvement in charging speed or integrity/longevity of the battery by purchasing Samsung's 25W charger?

Tmel14 said:
Would I notice much of an improvement in charging speed or integrity/longevity of the battery by purchasing Samsung's 25W charger?
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Click to collapse
That's the charger I've been using w/ S21Ultra (25W from N10+) and I figured out I won't be needing anything bigger then that. Thanks to Samsung 'super fast charging' the 5Ah battery on s21U charges faster then 3.8mA Pixel 4a5G battery(with the same charger). +/- 1 hour and done!

Question Fast charging, and superfast charging

I have the Samsung 25w charger, and when using it it appears the phone will only either cable charge or superfast charge. It wont also fast charge. I want to maximize the battery life span of the phone, and cable charging is inconveniently slow, and I figured that fast charging would be a happy medium between that and maxing it out. I was under the impression that it's the phone that dictates the rate of charge it will accept from the brick, and the brick only determines the maximum deliverable current. If I understand correctly, we can use samsung's 45w charger, but the phone will obviously only allow 25w from it. I'm puzzled why when using the 25w charger the phone can't just accept 15w when set to only fast charge. Is this a bug?

Hi,
You might plug in your phone, Go to Parameters, Section Battery, Advanced Battery, and activate Super charge and superfast charge in order using fast and supercharge with your 45W charger !

Yes, I've done that. The 25w charger will only super fast charge, but won't just fast charge. I would have thought it could either one, whichever I have it set to do.

if you want fast charge ..... deactivate superfast charge should be the solution ! Isn't it ?

Probably a firmware/software glitch.
Fast charging will not enable if battery temp is too low.
To avoid Li plating the battery temp should be a minimum of 72°F or higher, the preferred minimum is 80°F.
Using the 45 watt brick may shorten battery life.
Fast charging with the 25 watt brick appears to do little damage.
Li's prefer brief, frequent midrange charges ie 40-65%. Avoid discharging below 30% and charging beyond 90% although 80% is a better top limit.

fission6606 said:
if you want fast charge ..... deactivate superfast charge should be the solution ! Isn't it ?
Click to expand...
Click to collapse
No, if you only activate fast charge (with superfast deactivated) and use the 25w brick, the notification in the shade says cable charging, and that takes like 2hrs to charge the phone.

ac42 said:
No, if you only activate fast charge (with superfast deactivated) and use the 25w brick, the notification in the shade says cable charging, and that takes like 2hrs to charge the phone.
Click to expand...
Click to collapse
That doesn't sound like fast charging is active. It should gain about 2%@minute through most of its range except the top end where it goes to about 1%@minute.
When this doesn't work correctly it's a true pain to troubleshoot. My 10+ started dropping out of fast charging prematurely. A new 25 watt brick/cable and trying a lot of other remedies still hasn't fully restored it.

I'm curious if anyone here has a 25w brick that could confirm if this behavior is present globally, or if this is something just on my device? Only activate fast charging in the battery settings, plug the phone in with the 25w charger, and look in the notification shade and see what the charge rate is tagged as. I'd be grateful if someone would confirm this.

blackhawk said:
Probably a firmware/software glitch.
Fast charging will not enable if battery temp is too low.
To avoid Li plating the battery temp should be a minimum of 72°F or higher, the preferred minimum is 80°F.
Using the 45 watt brick may shorten battery life.
Fast charging with the 25 watt brick appears to do little damage.
Li's prefer brief, frequent midrange charges ie 40-65%. Avoid discharging below 30% and charging beyond 90% although 80% is a better top limit.
Click to expand...
Click to collapse
I have noted that you practise the same charging procedures as I have done for several years (and you obviously have done as well). With my Note9 and S8 + I used to not let it drop below 40% if I can avoid it and also not go above 80%. All this is fine and most of this we all probably learned from Battery University and Isadore Buchmann. That all said, and I am really not sure if I am keeping this phone - Decision today or tomorrow - my question comes to the matter of calibration. When I received this phone some 14 days ago I charged it to 100% but thereafter did not run it down to zero but kept it above 40% the whole time. The question I put to you (and others can learn from your response) is there a need to "calibrate" the device initially (ie run down to say 10% for example once a month) as was suggested by Buchmann probably a few years ago?

blackhawk said:
That doesn't sound like fast charging is active. It should gain about 2%@minute through most of its range except the top end where it goes to about 1%@minute.
When this doesn't work correctly it's a true pain to troubleshoot. My 10+ started dropping out of fast charging prematurely. A new 25 watt brick/cable and trying a lot of other remedies still hasn't fully restored it.
Click to expand...
Click to collapse
You and I discussed this earlier. Do you think it is the port that has become damaged? Part of the reason for my getting the wireless charger is my Note 9 is very erratic when it comes to fast charging. Cleaning out the port with a toothbrush/compressed air. rebooting...wiping cache partition, new cable etc never truly fixed it for me. I do feel that when first plugging in the S21 ultra (before going wireless) the connection seemed a lot firmer.

ac42 said:
I'm curious if anyone here has a 25w brick that could confirm if this behavior is present globally, or if this is something just on my device?
Click to expand...
Click to collapse
It does appear to be related to the Samsung 25w brick. I have the one that came with my S20U. It will "Super fast charge" my S21U no problem. If I turn off super fast charging in the phone, it only says "charging" when plugged in, and with my phone @ 65%, it said it would take well over an hour to charge (forgot the exact time). Then I took my phone w/o changing any settings to a generic 18w QC3 brick, and it said "fast charging", and said it would take 44 mins to complete.

Ive seen this same type of issue as well with 2 different chargers. One charger (45w pd) will fast charge with super turned on but not fast, notification only says fast charge. The second (39w qc3) will fast charge with regular fast charging turned on, but turning on super does nothing. Charge times are the same with both chargers on regular charging and fast, with 0 differemce between fast charging and super.

peterg21 said:
You and I discussed this earlier. Do you think it is the port that has become damaged? Part of the reason for my getting the wireless charger is my Note 9 is very erratic when it comes to fast charging. Cleaning out the port with a toothbrush/compressed air. rebooting...wiping cache partition, new cable etc never truly fixed it for me. I do feel that when first plugging in the S21 ultra (before going wireless) the connection seemed a lot firmer.
Click to expand...
Click to collapse
I'm as clueless as you at this point unfortunately.
My port is good, cable/charger, tried hard reset, cleared system/akp caches, did the recall thing and so on.
I'm wondering if it's a battery fault. Do older batteries go into fast charging the same as newer ones? It's almost as if it's throttling the fast charging, sometimes it's full bore then it drops out to 1%@45 seconds then to 1%@minute.
Or is it a calibration ie it thinks it's at 90% when it's only at 70%?
The only I haven't done is a factory reset, lol.
All this started one night when it was slow charged to 100%. WTF?
TFF the curse of technological Beast!
Guess I'll try recall again.

dscline said:
It does appear to be related to the Samsung 25w brick. I have the one that came with my S20U. It will "Super fast charge" my S21U no problem. If I turn off super fast charging in the phone, it only says "charging" when plugged in, and with my phone @ 65%, it said it would take well over an hour to charge (forgot the exact time). Then I took my phone w/o changing any settings to a generic 18w QC3 brick, and it said "fast charging", and said it would take 44 mins to complete.
Click to expand...
Click to collapse
Right on. Sounds like it's not just my phone. That's a relief. It's puzzling why the phone can't also fast charge with that brick. Perhaps it's simply a bug that Samsung either never noticed, or it isn't a priority to them. It would be nice if we could take advantage of the different settings without having to have two different bricks sitting around.

I think I figured it out. The fast charging setting is for the old classic fast charger. If you connect your phone to that one, you'll see it says it's fast charging. If you don't have fast charging turned on, it'll prompt you to turn it on to use that charger at it's maximum capability. If you use one of the newer Samsung C to C bricks, it's going to do the super fast charging.

I am currently using this Baseus charging plug and get full range of charging options - fast / super fast.
Thought I would try some I have hanging around before buying a Samsung one.
Baseus USB C Charger 120 W with GaN Tech Power Delivery USB-C Power Supply Compatible with MacBook Pro/Air, iPad Pro, iPhone 12 Pro Max/11 Pro Max/XS Max, USB C Laptops, Surface Pro, Galaxy, Huawei: Amazon.de: Computer & Accessories
Baseus USB C Charger 120 W with GaN Tech Power Delivery USB-C Power Supply Compatible with MacBook Pro/Air, iPad Pro, iPhone 12 Pro Max/11 Pro Max/XS Max, USB C Laptops, Surface Pro, Galaxy, Huawei: Amazon.de: Computer & Accessories
www.amazon.de

a.gordon1989 said:
Ive seen this same type of issue as well with 2 different chargers. One charger (45w pd) will fast charge with super turned on but not fast, notification only says fast charge. The second (39w qc3) will fast charge with regular fast charging turned on, but turning on super does nothing. Charge times are the same with both chargers on regular charging and fast, with 0 differemce between fast charging and super.
Click to expand...
Click to collapse
XDA just covered this in their article:
Fast Charging Explained: The slowest to the fastest Fast Charging technologies
Curious about fast charging? Here's everything you need to know about fast wired charging standards and how to pick the best charger!
www.xda-developers.com
Unless a charger has USB-PD PPS they will only FAST Charge @ 18w with fast charge on (super fast on/off wont matter as it will be off). If you are getting super fast charging then you are getting the expected 25w which is totally fine and not bad for battery. You will get super fast with the samsung 25w adapter and maybe the previous series 45w adapter.

I have a 45W USB-C PD port as part of an Anker PowerPort and also the 18W charger that came with my Pixel 5. Would I notice much of an improvement in charging speed or integrity/longevity of the battery by purchasing Samsung's 25W charger?

Tmel14 said:
I have a 45W USB-C PD port as part of an Anker PowerPort and also the 18W charger that came with my Pixel 5. Would I notice much of an improvement in charging speed or integrity/longevity of the battery by purchasing Samsung's 25W charger?
Click to expand...
Click to collapse
No huge charging improvement. It most likely will degrade the battery faster.
I use only the Samsung 25w bricks because they are known good and relatively cheap.
Just picked up a 25w brick and cable for $20.
The amount of trouble a defective charging hardware can cause means I won't consider using 3rd party chargers/cables for fast charging.
Fast charging is a nightmare to troubleshoot as I'm learning now... will see if a couple full 100-0% charge cycles get it or not.
It's time consuming and irritating.

thegr8anand said:
XDA just covered this in their article:
Fast Charging Explained: The slowest to the fastest Fast Charging technologies
Curious about fast charging? Here's everything you need to know about fast wired charging standards and how to pick the best charger!
www.xda-developers.com
Unless a charger has USB-PD PPS they will only FAST Charge @ 18w with fast charge on (super fast on/off wont matter as it will be off). If you are getting super fast charging then you are getting the expected 25w which is totally fine and not bad for battery. You will get super fast with the samsung 25w adapter and maybe the previous series 45w adapter.
Click to expand...
Click to collapse
Thanks for posting the link to that article. It clears some things up. Charging standards have become rather confusing with all the proprietary standards. This makes me feel more comfortable using the 25w super fast setting on the s21 ultra.

Question Best charger/wattage for best battery life span

Hello people I recently acquired my 11t pro and I know that the 120w charging, first it's amazing, but second it's kind of concerning to think that such a charging speed might not wear down the battery life even though Xiaomi claims 800 cycles and a bunch of certifications.
So I've decided to only use 120w on hasty situations or while traveling, etc. And I happen to have different xiaomi chargers.
The question is which do you think is the best wattage or charger to make battery life span longer 22.5w or 33w?
(wish I had the 67w from the 11t, but unfortunately I don't)

You're correct. Fast charging is poison for battery lifespan, of course the device makers love that because $. As low and slow as possible is the way to go, 18-25 W as a good trade off I would say. Some, including myself go even lower.

yeah,I haven't tested the 11t pro but with a redmi note 9 using a samsung note 9 charger it looked like the redmi wasn't getting any charge up. So that low is good?

i use 12/15w and its perfect !

Im charging mine with standard 5v 2A (its slow, but i thing battery will have better life down the line) since im planning to use my phone for 4-5 years minimum (last phone oneplus 2 was in use 6 years)

austick said:
i use 12/15w and its perfect !
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Doktor-X said:
Im charging mine with standard 5v 2A (its slow, but i thing battery will have better life down the line) since im planning to use my phone for 4-5 years minimum (last phone oneplus 2 was in use 6 years)
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How long does it take you to fully charge? Or what charging strategies do you use?

Vaizen said:
How long does it take you to fully charge? Or what charging strategies do you use?
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75min aprox but i charge at night

Vaizen said:
How long does it take you to fully charge? Or what charging strategies do you use?
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Today i charged from 17 to 100% in about 2h 10min using 10w (5v 2a) charger

austick said:
75min aprox but i charge at night
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Click to collapse
Doktor-X said:
Today i charged from 17 to 100% in about 2h 10min using 10w (5v 2a) charger
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Click to collapse
Both options are good ideas for overnight charging. Will keep that in mind using a Samsung charger

Vaizen said:
Both options are good ideas for overnight charging. Will keep that in mind using a Samsung charger
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Click to collapse
Yes, you are right, when you are not in hurry i dont see reason not to use slower speed charging and then if you need speed use fast charger once in awhile

Well just as an addition I've tested several chargers with different wattages and these are the results in terms of time:
Samsung 10w - 2h:40min ±
Xiaomi 18w - 1h 30min ±
Xiaomi 22.5w - 1h 05min ±
Xiaomi 33w - 50 min ±
Xiaomi 120w 17 min at least for me.
Charging from around 10 to 100%

I am using Samsung 15W charger, around 2h to fully charge the phone.

I use a 33W charger from my K30 Pro Zoom. I charge from 20% remaining to 90% in 30 mins. Probably 45 mins if totally drained but never have to wait for an hour to fully charge. I only use 120W during business trips or Out of town.
By the way, your cord needs to match the type of Charger you are using or you'll just end up with a bottle neck charging.

I think the best option would be 65W, either mi charger or anker. Im currently using anker 65w charger, and oh my god, im getting a beautiful battery life of upto 8 hours sot on heavy usage. And by heavy usage i mean, streaming, maps.
With heavy games as well, its a bit lower. But charging with 120W affects the battery negatively. And i think it doesnt charge it completely even though it shows 100%.