Reserve Power Packs Message #7 Posted by Tony Duell (UK) on 6 June 2002, 7:50 p.m., in response to message #6 by David Smith
Actaally, battery chargers exist for (almost?) all the the calculator batteries. HP called them 'Reserve Power Packs'. They consist of a plastic box to hold the battery with some very simple circuitry inside (often close to a copy of the calculator charger circuitry). You connect them to the same AC adapter as you'd use with the calculator (well, with one exception -- the classic-series reserve power pack uses the 3 pin adapter as you'd expect, but of course it can also charge the battery in the HP75 which itself uses the 8V 3VA adapter).
These Reserve Power Packs certainly exist for the Classic, Woodstock, Topcat and Spice models. The Classic one seems to be the easiest to find, the Spice is by far the rarest (in fact I'd never seen it mentioned until I found one).
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