Quote Originally Posted by unsub View Post
I can report that the OEM USB port in the left saddlebag will charge a WinPlus jumpstarter rated at 8000 mAh (3.7v) 2700 mAh (12v)

I can't tell what the charge rate will be but I imagine it'll at least keep a device topped up while driving.

I hope this helps somewhat.

Happy trails..
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.