HP 25 and HP55

[Ron Hudson]

On Oct 21, 2004, at 2:59 PM, Dwight K. Elvey wrote:

>> 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.

I won't charge them in the calculator, they are regular AA cells so I
can remove them and put them in a proper charger. :^)


>
>>
>> -- 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.
> Dwight
>
>>
>>
>> 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 :^)
>>
>>
>
>