Lipo Ste for HP-41 battery pack

[HP-Collection]

Initiate by Hans-Peter I also modified some of my old HP-41 rechargable battery packs with Lithium cells.
Now I have some electronical parts for sale:

A set contains:

1x Lipo battery 250mAh
1x Lipo charger module
1x Level Booster (you can choose 5V or 6V)
2x battery connectors

You have to use your old battery packs for the modification. I also have some spare units. You can also use the 3D printer to build the battery door.

I can sell 1-2 sets for €10.