[SL2]

My 1020 is now 2.5 years old and I want to know how much the battery capacity have dropped.

How do I check this?

[gpobernardo]

You may use the AIDA64 app for this. In my Lumia 1020, the current battery wear is 5% after over two years of ownership.

[SL2]

Thank you for the tip. I actually reacalled using that very same app a long time ago for that, but this is all it gave me today.

[SL2]

You may use the AIDA64 app for this. In my Lumia 1020, the current battery wear is 5% after over two years of ownership.

How did you find this out? I assume it was in the battery tab? As you can see in my pic, there's no info about battery wear.

[gpobernardo]

That's strange. There should be a label there called "Wear Level" under "Battery". But the interface of your Aida64 looks very different from mine - are you still in Windows Phone 8.1? I've upgraded mine to Windows 10 Mobile already, and the app versions might be different. My Aida64 is version 2.0.6.0.

[SL2]

That must be it, I'm still on 8.1 and the version is 1.1.1.0. I guess I must have been on W10 when I tried it the last time.

Is it still possible to go back to 8.1 in case I don't like W10?

[gpobernardo]

Yes, it is still possible, though I haven't tried it myself yet. The WDRT should do the trick, but do some reading on it first.

[P1ng0fDeath]

Mine shows 0% of wear after one year of use. Is that possible?

[gpobernardo]

I think the "module" that describes battery wear sends data in multiples of 5, so 5%, 10%, 15% - it's more affordable that way. So it's possible that your battery has between 5% and 0% wear, exclusive of 5%.