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[Kill3rT0fu]

I'm just curious what the feasibility would be for a DIY power tank. Does the S model need any modifications to the charger/controller if there's an added battery pack to the bike?

[MVetter]

Well the bike is expecting whatever second battery you plug into it to integrate with their BMS (unless you don't run a BMS, truly living life on the edge like a wild man) and their pack voltage which is going to mean a pack running 28S. Terry Hershner ran several BMS-less long bricks for a few years which was only mildly terrifying. You could try to message him on FaceBook since he's rarely on here these days.