The NiteRider Classic Plus Bike Light System is powered by a 4.0AH NiMH frame mount battery, allowing it to push out 12, 20, and 32 watts of halogen light at the touch of its handlebar-mounted button. Run times for the NiteRider Classic Plus Bike Light System are 1 to over 3 hours, depending on which setting you select - and you can recharge in less than 2.5 hours with the NR 2.5 International Charger that's included!