is this thread still alive?

my 5730 suddenly battery drain out very fast.
1 day I charge the phone, as usual, and unplug after fully charged. Next day afternoon the phone get off. At first I thought maybe I accidentally switch off the phone (but how ar??) then I try to switch it on. Failed. End up, I have to recharge it. Then after 1 or 2 day normal, it happen again.

Now I need to charge the phone everyday and it only last for few hours... on standby mode