HP15C CE - Battery problem

[RPNerd]

(09-30-2024 07:03 AM)Johnh Wrote:  Thanks for all the input, on two threads. Based on that, I have a good workaround, and its fully reversible.

I'd reverse it now if I were you and if you don't want batteries to leak and/or swell in the calculator.

If both batteries don't have exactly the same charge level then one is going to try and charge the other. In circuit, the positive terminals of the batteries each go to the anode of a diode and the cathodes of those diodes are connected together to form the positive rail at about 2.5V. This prevents discharge from one battery to the other and allows for load balancing.

If your calculator went dead when you removed one battery then it simply means that the other one didn't have enough juice left to power it.