Xiaomi PRO/PRO2 - 36V 10000mAh extra battery

thingiverse

Original Xiaomi batteries are very good quality, but with a full battery replacement you have to sell your battery, often unreasonably cheap. So, the key idea is that there is no reason to COMPLETELY replace the scooter battery with another huge capacity one, it is better to ADD another small battery with a capacity approximately equal to the original one, finally getting the same double capacity with both batteries installed. This kind of additional battery is not too huge, so it stays under $100 even if assembled of good branded cells. The battery is connected via a cheap wires splitter and located inside the scooter, so you do not have to spend money on an external bag as well. Detailed battery making and installation tutorial: https://m365.embedden.com/double_your_xiaomi_scooter_range_for_100_usd