Very nice aaa battery pack for Classic Calculators

[Dieter]

(06-03-2016 09:54 AM)Maximilian Hohmann Wrote:  Rechargable 2500Ah NiMH batteries cost exactly the same as good alkalines and provide the voltage the calculator was designed for. The calculators can safely be used with it's charger when working at one's desk (try that with alkalines instead...).

As usual, I would not recommend the highest available capacity but Panasonic Eneloop NiMHs. They feature virtually no self-discharge so that they can be used even in calculators that you use only every few months.

The higher capacity compared to batteries of the Seventies yields a much lower relative charging current. This again means, with the original charger attached, harming the batteries by overcharging is nearly impossible. #-)

(06-03-2016 09:54 AM)Maximilian Hohmann Wrote:  And, also import to some, one set of NiMHs outlasts 500 sets of disposable batteries.

With an intelligent charger offering decent charge control, that is. I would not rely on this figure when using the "dumb" original HP chargers.

Dieter