Battery choices for Woodstocks

[Sadsilence]

I am using Tecxus NiMh Mignon rechargable batteries (1,2V, 2100mAh) for all my classics and woodstock calculators.

NiMH LSD technology, so extremely small selfdischarge rates and with flat tops. They fit perfectly in calculators' battery cases. Cells have industrial grade and are well balanced to each other.

For standard woodstock calculators I use single cells with soldering tags and solder them together/remove unnecessary tags to get 2 cell pack. For classics and e.g. HP-29C there are preconfigured 3/4-cell packs available. Original chargers can be used but of course it takes 24-48 hours to recharge a fully discharged pack. On the other side small charging rates (80-160 mA) compared to battery capacity have the advantage that you will not overcharge cells if you forget them for a few days ;-).