On Fri, 11 Sep 2020 13:10:31 -0400, Dennis Lee Bieber wrote:

> My first was an HP-25, and the third was the HP-28 -- I don't
> recall if the latter is in storage or self-destructed; the 25 died when
> I couldn't get new battery packs (it was the only one I owned that
> could be used at work, as it lost its mind when powered down... Working
> in a black program is a pain.)
>
I discovered how to repair the HP-21 battery packs: split them open and
replace the pair of AA size NiCd batteries. The inner case is just glued
to the textured removable base of the battery compartment and easily
enough removed with a sharp knife.

My latest effort, now that AA NiCds no longer exist, was more complex.
This time I fitted a pair of Perspex tubes as battery holders that each
take an AAA Sanyo Eneloop. These give longer runtimes between charges and
are still recharged by the original mains charger.


--
Martin    | martin at
Gregorie  | gregorie dot org

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