Buy Lipos.
2x https://chinahobbyline.com/shop/detail/145 in series. I use the same one on my trampa mountain board and they are amazing for the price.
Spend 40usd on a good bluetooth bms and get a charger for $20. about 220 usd all in for 300 watt hours.
You can make Lipos last 50 or 500 charge cycles just like lithium ions. Read this thread
and especially my long post here
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