If you ever live in a city with apartments, you'll see how important it is to have a battery that won't explode on you.
Some coop apartments won't let you have an ebike in the building period, due to the fire danger.
This will change everything for apartment dwellers.
You could wire this up inside your controller box of your ebike; connecting it directly to your battery.
https://www.aliexpress.com/item/1005001584663452.html?spm=a2g0s.9042311.0.0.27424c4dOkAO47
I used the switch and rear light on my ebike and love it. No need to recharge a separate battery...
I purchased the TK419 and wired up the electrical cutoff using a relay. The instructions that come with the GPS tell you to connect the 4th/yellow wire to a specific numbered contact on the relay, and splice the other circuit of the relay in-between the battery and the controller .The ground of...