1.Specifically design for use in R/C Racing Vehicles. 2.Batteries are housed in a durable,crash resistant plastic outer case 3.Instead of the traditional Ni-MH 7.2V2/3Abattery pack. 4.Longer runtime and less weight than traditional Ni-MH cells. 5.Installed equalizing/balancing port. 6.Can be recharged unlimited times every day 7.Plug and Play Hard Outer Case 18.5*32*87mm 7.4 Volts 1800mah Capacity (plenty for racing)