Willl one of these 52V batteries fit the Rad Rover?I'm not sure I'm following but I'll give it a shot. Normally, when updating to a newer battery, you would expect to match the existing wiring to the new battery wires with a pair of HD connectors. XT90's are often used as an example. So if I were going to wire up something like you're considering (an optional extra battery?), I would use an XT90 end on each battery, that would mate with an XT90 on the bike harness leading to the controller.
Wouldn't surprise me if a creative person came up with a new 52v battery in a case that could be matched to it with an identical case, then transfer the stock RAD battery to that case so he could interchange.
The only problem I could see with that would be concerning the low voltage cut off (LVC). The controller has this feature built in to protect your battery from an over discharge. Those are going to be different 48v vs. 52v and you would have to go into the display setup to change them each time the batteries were swapped (I think). You may be able to come up with a compromise setting, but I wouldn't take that idea to the bank.... -Al
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