The Museum of HP Calculators

HP Forum Archive 11

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Recharging an HP33c
Message #1 Posted by joe on 7 Apr 2003, 9:11 p.m.

How does one go about recharging an HP33C? There is one on ebay for sale, with no charger (of course). I kinda like the critter and was wondering if one of you guys would give me an idea here...

I know, I'm giving away the source for a good calculator but heck, you guys probably already have plenty of 33C's...

Any info would be appreciated.


Re: Recharging an HP33c
Message #2 Posted by hugh on 8 Apr 2003, 6:42 p.m.,
in response to message #1 by joe

if its the same as the 32, then the battery pack is two AA cells held together by a meta clip. its possible to carefully remove the cells from the clip and replace them with new ones (ie ni-cads).

alternatively, what i do is charge the batteries outside the calculator and not use the main adapter. this way i can use ni-mh batteries.

thats one idea anyway.

HP33c just stuff in AA cells
Message #3 Posted by Norm on 9 Apr 2003, 7:50 a.m.,
in response to message #2 by hugh


Why recharge it. Just stuff in AA batteries, Alkaline, Energizer, Duracell, etc. and calculate for a long time. Throw the cells out when they die out. Thats what I've been doing since I acquired a 34C .

Seriously because its an AA fit, you can get AA cells of your choice (NiCad if you like) and just stick them into there.

Remember that the + terminal is the one closest to the center of the calculator. Suggest marking it into there with a black fine-point permanent marker.

To bridge the far end, you use some sort of very thin metal foil. Aluminum in a pinch, though its kind of soft and crumbly. I have a piece of thin copper-braid in there presently, you know, its called "Solder Wick". Some .003" nickel foil would be perfect.

If you put in NiCad AA cells, you can charge the same way that HP had in mind originally.

Good luck !

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