I realize its been a long time and all that...
But do you think that this could be achieved again but with snap-in connectors for the wires so that the battery could be removed when the unit is off and then snapped in place before powering up?
The pics are all gone but I'd really like to resurrect my pile of MR-1 recorders and this seems the best place to start.
You could do this using any combination of connectors as long as the positive goes to positive and same for the negative.
After taking the unit apart it's really obvious where the battery connector is on the circuit card. I cut those wires in the middle and left them attached to the connector (it's a small, white, plastic Molex connector) and the replacement internal battery. Then drilled the hole, fed the wires from the larger battery through there and connected the positive leads from both batteries to the positive leads from the connector. Same with the negative.
This scheme uses the existing USB or 5V input charging circuit to recharge the batteries. Not sure why you would want to be able to remove them (other than for replacement every few years) since the device itself charges them?
