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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...