CMOS Reset on galu1

I have recently replaced battery on old galu1 model. Computer tus on and works fine while power cord is plugged. When I unplug the power cord, laptop immediately tus off, even if it is in sleep mode. System detects the battery and gives me information about it. It tells me that I have between 69 and 72 (number may be changing over time) battery is constantly in "charging mode".

I would like to try to reset battery manager, there is a slight chance that it will fix this problem. I assume it should be done by reseting CMOS memory. Is there any instruction on how to do it?