Qtek 8310 killing batteries

[Guest petec500]

Strange one this. I brought my Qtek 8310 out of retirement and set it up with CameraAware3 primarily to collect Navizon points. I upgraded it to WM6.1, which all went well and i've been using it for a few weeks now. However, in the past 2 or 3 weeks, it's killed two batteries - that is, the phone is totally dead - wont power on and wont charge. After the first one went down, i dug out the battery from my old C500 and that worked for a couple of weeks, but now that one's gone too. I've tried leaving the battery out overnight, but this morning it's still dead. In fact, i tried the original dead battery back in my C500 and that didn't power up or charge either, so i'm pretty sure it is the battery.

Any ideas what's causing this? I hadn't left the phone on with wifi and bluetooth running (needed for Navizon) - always disconnected before leaving the phone in standby.

Does this mark the end for my trusty old Tornado?