HP 25 and HP55

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Thu Oct 21 16:59:15 2004

>From: "Ron Hudson" <ron.hudson_at_sbcglobal.net>
>I just got some HP calculators!
>Now I have some questions :^)
>--Anyone have a spare manual for either?
>--Have pointers on replacing the battery pack on the 55?
>(it seems to be 3 AAA nicads)
>--Anyone have any pointers on cleaning up leaked nicad crystals?
>what is that stuff anyway?

 Most likely potasium hydroxide or similar base. You need to first
wash with water, then 50% mix of white distilled vinegar followed
by a rinse and dry.

>I do have cases and power suplies.
>-- I took apart the 25's battery pack and replaced the nicads with
> nickel metal hydride cells (the same ones I use in my camera)

 Not a good idea. Nickle metal hydrides need different types of
charging. The won't last long with a NiCad charging circuit.

>-- Is is ok to run the 55 on wall power supply without a battery
> pack installed?

 Don't know. You should be able to find NiCads to replace.
Check out JameCo. Also, we have a place called Batteries Plus
that will weld together NiCad stacks.

>Will trade the 55+case+powersupply+leakybatteries(in a ziplock bag)
>for complete set of docs for the 25 + 1 good application book,
>preferably games :^)
Received on Thu Oct 21 2004 - 16:59:15 BST

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