this ones great cause it has fast charging.

https://www.amazon.com/gp/product/B078FTSJWJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

youll need a sae connector too

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I'd recomend getting a waterproof wireless charger and sealing every connection with silicone.

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I just attached an iphone cable at first, and with just a drop of water it will bust the cable, and or drain the battery.

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I also occasionally had starting issues, so i cleaned my terminals and put vaseline all over them, but just in case, I removed the running light from the headlight housing, snipped the cables, and ran the usb to that. This way it turns on and off automatically when the bike does.

I had the idea when I decided to replace the notoriously crappy plastic lamp with a glass one, and got one without a spot for the running light bulb by mistake.

happy mistake

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https://www.amazon.com/gp/product/B001OMEPEU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

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while you are at it, upgrading to led bulb makes as much difference as replacing the lamp, and don't skimp on that part. The led has to be made to project the light exactly as the original bulb did within the lamp.

I settled on this one after trying the cheapos:

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https://www.amazon.com/gp/product/B079K4P1R9/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1