HP 33e and 33c battery packs


Does anyone know a source for battery packs for the 33e and 33c? I have several of them, with chargers, but no battery packs.



Series 30 battery packs are probably the easiest to construct. You take two AA rechargable cells with flat tops
(preferably with metal wire tabs if you can find them).

You then place them one next to the other and solder the positive end of one with the negative end of the other

+() | -
-| () +

You then use hot glue to join the batteries on the top
side and only a third way on the bottom (to allow of the
orientation tab on the bottom of the batery compartment).

Make doubly sure that the pack orientation is correct.

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