HP-21 and Alkaline Cells

[Stefan Vorkoetter]

Does anyone know if an HP-21 will operate on alkaline cells, or will the too-high voltage damage it? I'm restoring a 21 for a friend, and he no longer has the charger, so using alkalines would be the best option.

[Andrés C. Rodríguez (Argentina)]

I had used alkaline batteries on a HP 25 (not C) wihout problems. It seems that the voltage, while a little greater than NiCd, is within tolerance. The HP 21 should be the same (no warranties!).

Please check previous postings and obtain more opinions, to reassure yourself.