Finally acquired a Woodstock

[larthurl]

(11-06-2017 03:37 PM)mfleming Wrote:  I use a pair of Eneloop NiMH rechargeables. They don't have the self discharge problems of NiCd batteries so they last longer under light use conditions. Works for me, anyway! On the subject of battery holders, I stumbled upon this very nice one-piece design

https://www.thingiverse.com/thing:1276886

I uploaded the design to Shapeways, made a small correction and ordered one for under ten dollars. Two batteries fit snugly side by side. I used a pair of connected coil springs to connect the batteries together and press them against the calculator battery contacts. The springs are replacements for those used in HP-41 battery holders. The battery holder fits into the calculator very nicely!

This design will save you the bother of taping the two-piece holder design together each time you change the batteries. The plastic used is supposed to absorb paint very well so I may soon try to match the calculator body color.

I highly recommend the holder,
~Mark

Hello Mark:

do you have a link to the shapeways version of the HP-25 battery holder you did?
I'd like to get one for my Dad's HP-25.

Thanks

.....Art