That'd be more mileage than I can endure in one cycle ride. I don't know how my BBS01B controller and display will respond to their fully charged voltage, but displays don't cost too much and I have a spare controller... or perhaps I could reduce the output voltage using a suitable converter. The expansion of individual lipo packs would be contrained by each of those casings. I could experiment with three smaller packs, or re-route the internal wiring of one; change the BMS. All good food for thought.In my ill advised back of envelope way I'd be tempted to whack three 12v 30a lifepo4's in series (can be had for about 100 quid each), which would give three times 385wh (in fact am half tempted to do this for old ebike I have with too saggy battery that use about 800w max, plonk it in something like big carradice saddlebag perhaps).
For your car conversion? Too heavy probably.Renogy (have no first hand experience) sell 12v 400a (just over 5kwh usable) for a black Friday £1.8k.
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