Battery pack of HP 25 calculator

[Graan]

Ok I understand now. Seems the battery pack have been modified since there were no tabs in the battery holder (connection to calculator), just the battery poles contacting the connectors in the calculator. There is however a spring connector connecting the + and - at the end of the batteries.

When turning on the calculator with the above arrangement the display was flickering. But as said, when connecting to a PS the calculator worked fine.

Yes 1.3 V is open citcuit. Have not tested the batteries more.

As seen in the PS the calculator draws aprox 150 mA.