My 40D battery @ 13th month suddenly no longer holds charge.
It worked very long in the previous few outings but yesterday, after charger read FULL I plug into the cam, it said 1. After tens of shots it blinks and gone. I think I charged it for less than 40 times.

Bought same time with 40D, 13 mths, under warranty.. I thought lappy batteries lasts 200+ charges..