Depends on how long you've had the battery ?
P.S - You can't 'calibrate' a S2 battery. It's impossible. Ignore the crap on here/elsewhere saying you can.
Extra P.S - Which S2 variant are we talking about - I9100 ? (Ignore what I'd said about double posting, your other thread in General is sufficiently different, though you'd probably get more help if it was in Accessories).
Nah it's all good about the other thread, you're asking where to buy batteries so that's cool
3 yrs eh ? Getting anything beyond 18 mths is pretty good assuming you're charging it at least a little once per day (if you're doing a full charge/discharge you'd get less than that), and even if you're not doing that (say charging only every 2nd day), two years is pushing it.
You've done well to get 3 yrs out of it. I mean, you could get BetterBatteryStats & see if there's wakelocks/whatever causing drain that you might be able to reduce, but everything you've said points to a simple case of the battery being on the way out, so a replacement is probably the go.
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