Mounting ebike battery

General Discussion Build Logs
1

Hello. I’m not a Framebuilder but have a question and figured this was the place to start.

I have an aluminum tandem that I’ve converted to ebike with a Bafang kit. It’s a traditional frame with the extra tube from head tube to rear BB. I want to mount the battery on the bottom tube but there’s not enough room to slide the battery in and out of the mounting bracket. Can I drill through the bottom tube and attach bracket to frame with a through bolt from underneath or will this weaken the frame.

Thanks

2

The tube will deform and battery will come loose. If you retighten it, the tube will just ovalize more. Since you are not a framebuilder, use a King Cage universal support bolt or a similar product.

3

Thank you for your suggestion. Unfortunately, that won’t allow me to slide the battery and mounting bracket out to the side as needed. I guess I’ll leave it on the down tube.