Originally Posted by
cat0020
If you can run the XP Premium with single battery then you can charge the other battery while one battery is being charged, no need for two chargers to charge both batteries off the ebike at the same time.
You're correct. Something to keep in mind is these batteries are discharged alternately to deliver the larger range at higher power. From my experience using single battery is as they deplete; the voltage drops a so does the power. When both batteries are at 20% it's nice before a next day ride to be capable of topping both off within a certain amount of time rather than have to wake up in the middle of the night and move the plug. I noticed the plug on the down tube battery is separate from the physical battery port so I'm wondering if maybe plugging into that port may charge both batteries?? I don't think so, but worth looking into for sure!