Charging a GoPro on the go.

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The ratings you're using here are the WinPlus Jumpstart's battery OUTPUT. The input is the standard USB 5VDC, with the higher than "normal" current of 2 Amps maximum. Once fully charged the Jumpstart should use less current to "trickle" charge, and I agree, the bike's alternator can FULL or trickle charge these devices while the engine is running.

I only put those specs out there for product identification.

I used the thumb drive for music until I started using my GPS with a micro sd slot, but I understand not everybody uses a dedicated GPS..

Let us know how how your project works out when you're done.

Happy trails.