The Storm Helmet H.I.D. H.I.D. lamp system with 4.0Ah NiMH battery. Finally, incredible power in a package small and light enough to use on a helmet. 4 Straight hours of light as bright and white as the sun, mounted on your helmet, aimed right where you need it. Combined with a 3.5hr MicroBrute charger and 27oz 13.2v NiMH battery pack, no wonder 24 hour racers say this is the best light available. Features: Ultra Bright Metal Halide Bulb, New SurLok Connectors, MicroBrute™ 3.5hr charger with In-Vehicle charging optional, Multi-Position Helmet mount, Enduro Style flat pack fits into jersey pocket or hydration pack, 4.0Ah NiMH battery pack. System weight: 34 oz (mount, head lamp and battery) Burn time: 4 Hours