Hello HP lovers,
I am trying to restore a HP-75C S/N 2304... with a rather damaged battery compartment. I am a bit puzzled because it contains 3 contacts and, as far as I know, the corresponding battery pack 82001B only have 2 pads. Refering to the battery compartment on the picture http://www.hpmuseum.org/75int2b.jpg, I have the two left contacts (top=black wire, goes to VN on PCB i.e. ground; bottom=red wire, goes to VB on PCB) and an extra contact on the right side of the top ground (blue wire, goes to VA on PCB). A previous owner apparently has tried to cut it and to solder it to the top ground contact. Does anyone else have the same configuration? Is there a battery pack similar to the 82001B with 3 pads. I assume the third contact is designed to recharge the battery ... should I keep the makeshift jumper to the top ground contact? Any suggestion?
Kind regards.