Recommendation: You should look for a single 72V High-Discharge Lithium pack (at least 30Ah-40Ah) specifically rated for 4000W+ to ensure your motorcycle has the "torque" and safety it needs.
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By vevor
Amperage Bottle-Neck: These 10.4Ah batteries are rated for 1000W motors; a 4000W motor pulls 4x more current, which would likely trigger the Battery Management System (BMS) to shut down instantly.
Heat & Safety: For an off-road motorcycle, using two small "folding bike" batteries is actually an "underkill"; the high vibration and massive power draw of off-roading would overstress these light-duty packs.
By vevor
The Voltage Trap: Your 4000W motor is almost certainly a 72V system, while these batteries are 48V; the motor will not run (or will perform very poorly) if the voltages don't match.
Serial vs. Parallel: Connecting two 48V packs in series creates 96V, which would likely fry a 72V controller; connecting them in parallel stays at 48V, which is insufficient for a 4000W motor.
By vevor
