ECS GF8200A Checksum Error!

Hello guys, my office's computer, a ECS GF8200A with a X3 Phenom 710 has been giving me a minor headache regarding the cmos/date/time settings!

This computer is very recent, however, whenever I plug it off from the power, it loses all the configuration, data, time and such coming up with a "CMOS Checksum" error.

The battery is new! I bought another battery and still happening the same problem, I even tried to update the bios (went sucessfully) but still no luck with this problem.

The computer is new but it´s not in the warranty, what could I do to solve this issue ? This really bothers me since I have to set all stuff back again such as raid, date, boot order, minor overclock and all. And yes, I have tried the default settings.

Thanks, I appreciate any help.