HP-67 a nearly hopeless case

[Geoff Quickfall]

Bernhard:

To say you never cease to amaze is an understatement!

As far as the battery spring contacts go, harvesting from a parts machine is the only option I have seen, if you want to keep the original look.

I have removed the bad prongs in a machine as an experiment. Replaced them with a phone type plug. Milled out a square hole to accept the male end in the battery compartment at one corner. Then purchase a three nicad phone battery pack and plug it in. Close up the battery cover and voila, done.

Charge in the calculator, or use an old house phone to charge the pack externally. Did this for the spice series as they represent the largest failure design for battery prongs.

Geoff