Wwman 2pcs 3.7v 600mah Official Battery for UDI Udi001 Venom High Speed Boat Spare Parts For UDI R/C UDI001 Venom Speed Boat. Size:39.7*37.4*19mm/1.56*1.47*0.74 inch. Weight:50g/0.110b. It will give more PUNCH and ROBUST performance due to its higher current output and power. Package included:2pcs 3.7v 600mah battery.