I have a 386 motherboard that I would like to use. It doesn't have cmos battery on the motherboard at all and it only has a external battery connector with 4 pins. The battery connector seems to want to charge the battery that I would connect to it because there is 5V between pins 1 and 4 (4.84V to be exact). Any advice on what kind of battery I should connect to it. First I was thinking just battery holder for 3 AA rechargeable batteries, but then I realized that AA rechargeable batteries seem to have 1.3V at most when comparing them to 1.5V alkaline batteries. 3x1.3V would only be 3.9V so I am not sure if that would be ok. Is there anything else I could use there or are rechargeable AA batteries the only option?