I have a refurbished Galaxy S3. Sometimes it charges to 100% while powered off, but reports 51% as soon as I start it up. Lately, it goes down to 50% or lower even right after charging.
I haven't installed many apps or used the phone extensively yet.
I find lots of links for determining battery drain, but nothing so far on how to tell if I need a new battery.
I'd like to be relatively sure it's a bad battery before replacing it.
Update:
I have eliminated the problem, but have no idea why what I did worked ;(
1) I bought an inexpensive charging-only cable. Using this, the phone charges very nicely.
2) I turned on Power Saving.
3) I bought a more expensive version of the battery.
Now the phone charges fully, lasts a long time, and keeps the charge when turned off.
None of this makes sense - especially the fact that it used to drain when turned off (not suspended). Changing the cable shouldn't have done much either because the old cable did charge the phone - or at least - the phone said it did.
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