Weird Battery Stats

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Hello XDA,

Been noticing bad battery performance on my device, only to find out that the problem might not be the battery itself.
Here are 2 screenshots that easily show the problem imgur.com/a/DMtGo

Basically, my phone was on sleep for several hours, turning the screen on 4 or 5 times just to check for notifications. I went to the power management, saw the graph steady while it was on sleep mode (battery at 64%), then in 50 seconds, 10% disappeared as shown in the second picture. Can somebody tell me what could be the root cause of this? I'd highly appreciate it

note: I took screenshots because i noticed the issue before, good thing is that i was able to replicate it.

The battery stats don't always update when the phone is asleep. This has been mentioned by others.

Originally Posted by BenPope

The battery stats don't always update when the phone is asleep. This has been mentioned by others.

Thanks for this, but my friend gets around 3.5h of screen time, i only get 2h. We have the same phones with similar serial numbers. We both have 3G always on (except when there is wifi) and both use auto-brightness.

Can you please guide me on how to diagnose? I have Carat and it isn't reporting anything suspicious.

Originally Posted by Kingroudy

Thanks for this, but my friend gets around 3.5h of screen time, i only get 2h. We have the same phones with similar serial numbers. We both have 3G always on (except when there is wifi) and both use auto-brightness.

Can you please guide me on how to diagnose? I have Carat and it isn't reporting anything suspicious.

Oh, you didn't mention this in your first post.

Both having auto brightness is hardly a fair test, maybe he uses his in darkened rooms and you use yours in direct sun.

I notice your phone signal is bad, which could cause battery drain.

I used to get about 3 hours use, auto brightness in darkened rooms, WiFi and data always on. My soft buttons died, sent for repair and now I get 4 hours with similar usage. They said they replaced screen, but they also replaced the case. Have no idea if they replaced the battery. Both phones arrived with an empty battery, but I suspect the first one was empty for longer which may have damaged it.

Originally Posted by BenPope

Oh, you didn't mention this in your first post.

Both having auto brightness is hardly a fair test, maybe he uses his in darkened rooms and you use yours in direct sun.

I notice your phone signal is bad, which could cause battery drain.

I used to get about 3 hours use, auto brightness in darkened rooms, WiFi and data always on. My soft buttons died, sent for repair and now I get 4 hours with similar usage. They said they replaced screen, but they also replaced the case. Have no idea if they replaced the battery. Both phones arrived with an empty battery, but I suspect the first one was empty for longer which may have damaged it.

How can i check for the battery health? I mean actual health percentage of what it should ideally be.