I’m looking for a battery around 1kWh. It should be approximately two lithium cells tall (~36mm) by two lithium cells wide (~130mm), and length can be variable, as long as it fits inside of something like the DIYE hard shell. It should be a pack (or packs) with internal BMS’s. It’d be great to be 48v, but something lower like 36v is fine. Bonus points if you also have a hard shell case.
Budget is around $300.