I bought my blackberry in august 2011 and it's now may2012, the battery was fine at first but recently it will be fully charged in the morning and then by 2pm the battery will have drained, what do I do? Will blackberry give me a replacement? Thank you

You should contact Research in Motion, the maker of the BlackBerry.

Personal opinion, they won't give you anything, at best they will suggest you contact the place you bought it from.

Actually, contact your carrier and see if the device is still under warranty. If so they should send you a battery.

And don't let this one run down below 20% if you can help it.