SEFEPODER 24V 9Ah Lithium LiFePO4 Deep Cycle Battery 2 Pack, 3000+ Cycles Rechargeable Battery for Lighting, Scooter, UPS(600W or Less), 24V Power Wheels and More with Built-in 30A BMS

I'm using a pair of these with a 48v 1000w brushed motor and cheap $20 controller: https://www.amazon.com/dp/B0G4GTNVK2?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 I'm planning on getting 4 of their 12v 20Ah battery for another 48v build with a 48v 1500w brushless motor and fardriver controller