HP-41CV Battery Problems

[aj04062]

I light rubbing with a orange eraser works well too.

I've found that sometimes this is caused by the screws either being loose or the back case has broken at the screw holes (under the rubber foot). The problem is that there is just not quite enough contact pressure on the PCB and putting the battery at an angle will give it that little extra force it needs. (Remember vectors!)

I hope it is just a cleaning as that is simple.