Just got a used C610 and the battery was being recognized with the factory BIOS but was showing 0% and unable to charge. I updated the BIOS to A15 or A16 i think and now it's not recognizing the battery at all. The battery light used to flash occasioanlly with the original BIOS but now does nothing. The BIOS and WindowsXP do not recognize the battery. Tried both bays but this is the only battery I have to test.