Long time lurker - the community has really helped me many times in the past. Thank you.
I now have an issue with my battery in my i9300. Phone and battery are 22 months old. All stock (updated to 4.3).
Phone gets charged every night from 10pm to 6am. Usage has been constant - no new apps added in last year.
Until 2 months ago, the phone would have 25% to 35% at the end of the day having started at 100% each morning
Then it started to drop to 15-20%. I thought - hmm - battery is aging a bit.
Then, in the bast week, suddenly, I get a max of 4 hours use, then battery dies. It recharges to 100% in one hour (I use a 10W charger) and then lasts again for 4 hours.
The battery is not bulging or showing other signs of being defective. There does not seem to be any apps that are using unusual cpu %. Phone is responsive.
My questions are:
1. Is it normal for a battery to suddenly degrade like this? I thought the Li Ion batteries degraded at a constant (20% per year half life) rate.?
2. Is using a 10W charger damaging to the battery (stock is 5W) ?