Root Extended battery falls off cliff randomly...

[Palmetto Fellow]

I bought one of the $6 extended batteries for my EVO on amazon. I rooted and deleted the batterystats.bin file and used my phone. The battery life seemed pretty good for awhile, and then, one night, I went to sleep at like 50% and woke up to a dead phone.

I assumed that something had gone wrong...so I investigated some. I noticed that Android OS had over 40% use or somehting like that, which seemed odd to me. I deleted the battery stats and decided to start over on training my phone.

I got at least 24 hours on the first charge after doing this which is what I was looking for. It dropped off sharply at the end...I figured it would as it learned the new battery...the steep drop off wasn't a concern for me...as I got 24 hours out of the phone, and Android OS was a mere 2%. Great...I thought to myself.

On the second charge up after resetting battery stats, I got about 24 hours again on the battery. Again, it had a sharp fall near the end of its life (I figured it's still learning this battery).

However last night, I was over 50% and it was dead again this morning. This behavior is however different. Yes, it died sharply...but the volume of the death is what bothers me.

During the second discharge cycle, I went to bed at 15% and woke up at 9%. It only used 6% overnight...so while it was still a sharp drop on the graph...it wasn't a fast drop. Last night was super fast. The Android OS usage isn't even displayed...so it's like 1% or something.

I have all sorts of screen shots over the course of this experience, but I didn't want to fill this thread with images from the start. I can try to arrange them in proper order and make sense out of them if anyone is interested in helping me learn what the heck is happening to my phone.

 

[ocnbrze]

moved you to the rooting section.

what rom and kernel are you on?

 

[Rxpert83]

Do you have a wake lock issue?

 

[Palmetto Fellow]

moved you to the rooting section.

what rom and kernel are you on?

I am on Mik2.61 with stock kernel.

Here's a quick picture just to show the phenomenon:

I am referring to the very steep drop at the very end of the graph. You'll see a period of time where the screen isn't being used. That's about the time I slept. The battery went from 50% to less than 3% in about 6 hours without the screen coming on at all. How do I begin to investigate this issue? Where/how do I determine about the wake lock? Is this where I compare the uptime to the awake time? I wish I had a screenshot of that, but I do recall at times seeing 3 hours of awake to 18 hours of uptime, so this isn't always happening. In fact, I have gone to bed at 15% and woke up to near 9% before, so this is definately intermittent.

The next time it happens, what should I document?

 

[Palmetto Fellow]

Does anyone have any suggestions?

 

[Granite1]

When I looked at the screenshots I see a lot of awake time.
Are you leaving your sync on all the time? It seems like either you are logging a lot of screen time, or there is something running while your phone should be sleeping.

I bought a sett of extended batteries from Amazon as well. I'm getting 24 to 30 hours as well, and I see a sharp drop of the battery in the last 10 to 20% as well. I haven't been able to figure it out either. I stopped worrying about it when I realized I'm still getting way more battery time than I need in one day.
My personal belief is that these batteries just don't have the build quality of the more expensive ones. I'll do a googles search and see what comes up.

 

[Rxpert83]

Looks like a wake lock to me, the last part of the graph is solid awake time when OP claims to have been sleeping. Should only lose a few % overnight.