> Start harvesting the snap-on battery cords from dead electronics. Cut
>> the wires off short (preferably inside the vinyl housing a bit). Snap
>> them on -- there you are!
>
> Most of those break after a few operations.
>
> You could take a dead battery apart and use the connector block from that
> after insulating. Usually far stronger than the wire ended connectors.
>
That would be my suggestion, you could insulate the terminal rivets with blobs of epoxy glue or with some makes of battery the blank plastic insert from the bottom could be superglued on for insulation.