The nickel metal hydride (NiMH) batteries used in the Toyota Prius are designed to work in tandem with the factory enclosures and battery management system. While these batteries work wonders in a Prius, they should not be salvaged or adapted for use in EV conversions. These batteries were not designed to be the sole power supply for a vehicle nor to handle deep discharges; they are designed to be discharged a small amount and then sip a little recharge. If packaged improperly or charged at even slightly too high a rate, they could catch fire and possibly explode.
