New battery discharging faster than 6 year old one

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Xiaomi Mi A2

The Xiaomi Mi A2 (Also known globally as the Mi 6X) was released by Xiaomi in July 2018 in various internal memory configurations. It is part of the Android One program which guarantees updates for two years.

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DaveO @daveo52292

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投稿日: 2024年9月8日

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New battery discharging faster than 6 year old one

I followed the iFixit guide to replace the 6 year old battery in a Mi A2 phone with a new battery - which seemed to go OK once old battery was removed.
However, even after battery calibration, the new battery is discharging about twice as fast as the old one.
The phone previously lasted all day without a charge - now it doesn't get to lunchtime before shutting down. (I would at this point be putting the old battery back in but I damaged it on removal :(

Can anyone suggest how I work out what is wrong?
Is there any reason to think I'd have a different result if I tried (yet) another battery?

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I got a second replacement battery sent out from the supplier which was exactly the same as the first replacement (down to the identical serial numbers).

It was just as bad.

So giving up on that supplier...

Is it possible that the only available batteries for this smartphone are going to be poor quality aftermarket supplies?

How would I go about finding a supplier where the battery is likely to approach the quality of the original?

DaveO さんによる2024年9月12日

Well I bought 2 batteries from that same supplier and both were shockingly bad.

So I then bought one from iFixit EU and it was better... not better than the 6 year old battery - better than the first 2 replacements.

It got the phone back to how it was before I'd touched the original battery.

I hadn't considered for a second that replacing a 6 year old battery wouldn't give an improvement in battery life!

There's a old saying that comes to mind - something about 'if it ain't broke...'

DaveO さんによる2024年10月5日

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oldturkey03 @oldturkey03

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投稿日: 2024年9月8日

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@daveo52292 sounds like a bad battery. Of course, make sure that all of the phones settings are in battery saver mode. Also, close all background apps etc. If none of that works, you may need to try a new battery. Batteries right now are the biggest market for counterfeiting. There are so many old and damaged batteries being sold as new, that this happens quite frequently. I suggest you stay away from place like ebay, Amazon and Aliexpress for batteries.

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Thanks for the reply. Currently testing a replacement battery from same supplier... Not hopeful it's any different so far though...

Where would you recommend for batteries you would be assured are genuine good quality?

DaveO さんによる2024年9月11日

@daveo52292 that's a tricky one. IF I 'd be in the EU, I'd go here https://eustore.ifixit.com/products/xiao... since I know they stand behind their products etc.

What I do know for sure is that I stay away from Amazon, Ebay and Aliexpress when it comes to batteries. It is not that all sellers are bad, but all the bad ones are there. I prefer to purchase from stores that specializes in batteries, have a real human answer and have some sort of return policy. That way I can at least assume that they care enough about their business to remain honest.

oldturkey03 さんによる2024年9月13日

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I got a second replacement battery sent out from the supplier which was exactly the same as the first replacement (down to the identical serial numbers).

It was just as bad.

So giving up on that supplier...

Is it possible that the only available batteries for this smartphone are going to be poor quality aftermarket supplies?

How would I go about finding a supplier where the battery is likely to approach the quality of the original? — DaveO
Well I bought 2 batteries from that same supplier and both were shockingly bad.

So I then bought one from iFixit EU and it was better... not better than the 6 year old battery - better than the first 2 replacements.

It got the phone back to how it was before I'd touched the original battery.

I hadn't considered for a second that replacing a 6 year old battery wouldn't give an improvement in battery life!

There's a old saying that comes to mind - something about 'if it ain't broke...' — DaveO
Thanks for the reply. Currently testing a replacement battery from same supplier... Not hopeful it's any different so far though...

Where would you recommend for batteries you would be assured are genuine good quality? — DaveO
@daveo52292 that's a tricky one. IF I 'd be in the EU, I'd go here https://eustore.ifixit.com/products/xiao... since I know they stand behind their products etc.

What I do know for sure is that I stay away from Amazon, Ebay and Aliexpress when it comes to batteries. It is not that all sellers are bad, but all the bad ones are there. I prefer to purchase from stores that specializes in batteries, have a real human answer and have some sort of return policy. That way I can at least assume that they care enough about their business to remain honest. — oldturkey03

Xiaomi Mi A2

New battery discharging faster than 6 year old one

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