Originally Posted by Dr Z.

When driving the bike on bumpy trails or rough roads, the battery terminal connections fracture. The connections are in the grey plastic housing which the battery plugs in to.

I've driven the bike 25 miles and have had all of the ring terminals fracture
mulitple times... leaving you with no power.

I tried upgrading to yellow style (thicker metal) ring terminals but they fractured also...

The fix, is to cut a larger (square) opening in the aluminum battery support so the battery wires to the controller can move up and down freely when the male battery contact probes (spring loaded) are push down and released.

This (cut-out) can easily be accomplished (both sides of the battery holders) using a drill and a diamond wheel cutter (Dremel (tm) style tool ). The metal is aluminum and cuts fairly easily.

Protect your chain and gearing from metal flakes or used compressed air to do the final clean up.

The present design is (obviously) poor, as the opening is too small and is offset from the exit point of the wires. Therefore, the battery terminal wires bind and the weak ring terminals flex which will eventually fracture.

Well, anyway the bike was inexpensive and I still think it is a great value if you like tinkering... like I do!

I just checked the ring terminals after going on a 8 mile bumpy ride and everything looks OK!!!

I will provide more "field debug" information as required.

Dr Z.