HP-29C Low-battery warning, help needed please!

[PANAMATIK]

Thanks for these accurate HP-29C measurements. My higher threshold voltage was derived from HP-25 hardware, which doesn't have the POR chip and doesn't apply to this problem, sorry.

It should be easy to measure the threshold voltage at pin 3 of this particular HP-29C, perhaps it is higher than normal. Possible solution is to connect pin 3 directly to Bat+ instead of POR chip.

Bernhard