Hi,
as I've got several HP-41s, which I activate only from time to time, maintaining battery power is either a hassle. Either I switch calcs with only one complete pack or I have to buy quite a lot of these expensive N cells.
I wasn't yet lucky (or willing) enough to get a NiCD rechargeable pack.
Has anybody come around DIY instructions how build a NiCD pack from a normal battery holder? The only things I've seen so far were REbuild instructions, but, as it says: rebuilding is not possible without the building :-)
N sized cells are not too hard to find, it's the connection to the charger, that troubles me.
Thanks for any help.
Klaus.