stained's purchases

I don't think it wold be the fault of the rechargeable batteries as I use them on most of my engines and they work fine.

I think some more pictures could be useful in identifying the issue.Have you checked that the gears are all fine pr the wires aren't lose, as these could be the cause of some issues

Edit: I had a thought that the swich could not be making proper contact, and that could be the cause of the issue