Where can I get a rechargeable battery for my loco?
Sorry for the late reply. You can buy the individual cells from Tenergy, and you can also get a 7.4 volt battery pack from them.They also have some very reliable low cost chargers as well. These are available in a variety of chemistries, but the NMIH rechargeable are the lowest in cost. To use the battery pack you will need the adapter wire which came with the loco. I do not recommend the older NICAD battery packs.
The link to Tenergy is as follows:
https://power.tenergy.com/
There are other sellers of course but this one came to mind because I bought from them before.
Good luck & have fun
Loco Bill