c500 died after charging

[Guest turbominor]

Switched off my 2 month old c500 last night and connected it to the charger, to my horror it was dead this morning.

Got to work and took it in to out lab, tested the battery and it showed 2.7v instead of 3.7. Connected a 3.7 supply to the phone's battery contacts and it booted and connected to o2 first time.

Put the battery in and it drew 1.2 amps from the psu and turned the phone off...

Phone works fine with a co workers battery.

Called HTC (after orange said take a hike) and they are sorting a new battery out for me, but strangly said that the batterys only have 6months warantee!