S2 battery problems - is mine the right one?

[dandavis]

My S2 died completely a couple of weeks ago and went into a shop for repair (under warranty). They said it was the battery (which suprises me because when I took the phone in the guy put the batter from his S2 into it and it still wouldn't turn on) and say they have replaced it.

However, I used to get 1.5-2 days useage on a charge but now get around 10hrs maximum. Over night last night when on standby my battery went from 100p/c to 49p/c.

Is this normal?!

[greenman]

You have to cycle the battery through 2 complete charge /discharge cycles to optimise the charging chip.
With phone off charge to 100 %.
Now use phone until it turns itself off.
Repeat, then use phone as you normally do.

[dandavis]

And should it take more that 4hrs to charge?

[greenman]

From 'empty' that's about right.
It's unlikely you have the wrong battery, but if you are concerned take it out and check the details.
It's easy to search Amazon for a genuine Samsung replacement, and see if your battery has the same specification.

[dandavis]

My battery does appear to be the right one.

So, last night I went to bed with my battery fully charged. Seven hours later I woke up and my battery was down to 46p/c (that was with no apps or anything running, no wifi or GPS etc. - just on standby). Is that normal? This would suggest I'd get about 11hrs in standby which is slightly short of Samsung's published 620hrs.

[RichH]

I really don't believe you'll get anywhere near 620 hrs but something definitely not right with your consumption. As a rule, I drop 1-2% overnight. To drain as much as you are it sounds almost like the screen is on all the time.... What does your battery stats tell you is using the power?

[greenman]

I was having heavy battery use after updating to ICS. Tried everything but to no avail. In the end I returned to Gingerbread for a while and then back to ICS, but with a factory reset and Clear cache both before and after flashing.
Next, charged the battery to 100 % while switched off, and ran until it turned itself off. Repeated that cycle and now much improved.