I think there is some bug here, I also notice that though mutliple tools say the battery is 100% but android still says charging and only after 1/2 hour to 1 hour does android say charged.
BTW for me the charge time from full discharge to fully charged is about 3-3 1/2 hours and it does last a day for a moderate use (but i only use WiFi and keeps to 2G Network only)
If battery is really that bad , I would suggest first to do a full battery charge cycle (complete discharge to full charge) and then see how it performs else take it to service centre.
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