I think the 650 puts out more than the 400 which I have and I have ridden mine with full electric Gerbing gear...socks, pants, jacket, gloves...all going full blast and it handled it just fine. My riding was mostly on open highways with very little stop and go. You might pull the battery down a bit if you do a lot of town riding, but my theory is that even if the battery does get down, it will recharge shortly after hitting the open road.
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