Ordered an electric 'motorcycle', err... scooter

[mistercrash]

Too good to be true indeed. Those are starter batteries for ICE vehicles. They are not meant to be used in an EV. They are not 36Ah, they are 36Ah SLA equivalent. Which means a bit more than 20Ah. No BMS to monitor each cells to prevent over charge or over discharge or equalization during charging. Maybe you can get one of those LiFePO starter batteries to shave a few pounds off the new 370 Z you're going to get.