One of the most expensive aspects of radio-controlled model motoringis the cost of replacement batteries. This battery pack and charger can save heavyR/C users a bundle in disposable power sources.Tyco guarantees this quality ni-cad battery pack--rechargeable up to 1,000 times--to be the longest runningavailable (run times vary greatly with speed and power usage of R/C vehicle).The recharging unit plugs into any standard 110-120 volt wall socket and fullycharges the battery pack within 4 hours. Comes with a limited, 90-day warranty.--Jerry McCulley