Arfantitoys 2pcs 3.7v 600mah Li-ion Battery with USB Smart Charger for UDI Rc Venom Electric Boat Udi001 Specially designed to provide power for udi r/c udi001 venom speed boat. Can act as a spare or replacement battery for your boat, to increase the action time. Keep one more battery ready, and have more driving time and more fun Compact and solid body ensures the battery more stable and shockproof Completely compatible for UDI R/C UDI001 Venom Speed Boat