Adapting cell battery to HP 41

[Artur - Brasil]

Finally I adapted the same charger circuit and a pair of Lithium batteries to my Hp 82162a and Hp 82161a, HP-il printer and cassette drive.
I lose a lot of time testing my tapes and trying to use a step-up circuit too, but, at end, it could not fit inside devices...
The simple charger and batteries in parallel did a good job.