Weighing only 475 grams, the 9-cell Lithium-Ion battery is half the weight of comparable NiMH batteries
HID lamp provides 13.5 watts of intense natural light. 3 times brighter than comparable halogen systems
Two output levels provide multiple burn times. 675 lumens (5 hours run time) & 550 lumens (6 hours)
Built in low battery warning LED
Battery is only 7 IN long and weighing 475g (just over a pound). Total system weight 660g / 23.3oz.
Beam uses a proprietary peened aluminum reflector to ensure a super clean, even beam pattern with no jagged edges or dark spots. Comes with both a over-sized (25.8-31.8) compatible bar mount as well as a super adjustable and rugged Cabeza (helmet) mount. Lithium Ion Turbo Charger charges your battery to 80% in 2.45hrs and the tops it off in an additional 2.25 hrs. and Ensures optimal battery life by not overcharging the cells. Accepts wall voltage from 90-260 volts, so charging in the United States as well as Internationally is not a problem. 11.1V Lithium Ion battery pack.

High-quality bike light with 10-watt, high-intensity discharge (HID) bulb
Solarc technology produces sunlight-caliber illumination using far less energy
Integrated battery and light head eliminates wires for cleaner, quicker attachment . See clearly at night and alert drivers and other cyclists to your presence with this Alias HID light set from Planet Bike. Designed to fit 25.5 mm to 31.8 mm handlebars, the light includes a 10-watt, high-intensity discharge (HID) bulb that employs Solarc technology to light an efficient path. Solarc bulbs offer several characteristics that distinguish them from other metal halide lamps, including small size, low wattage, a short arc gap, and a high color temperature. From a user perspective, the bulbs produce sunlight-caliber illumination that maintains outstanding brightness through its lifetime while requiring just one third the amount of energy required to power comparable halogen lamps. Cyclists will also dig the light's integrated battery and light head, which eliminate wires for a cleaner look and a quick attachment. Other details include a 14.4-volt lithium-ion battery that charges in just under three hours, a custom soft case for convenient transport and storage, and a 2.5-hour runtime on the high setting and a 3.25-hour runtime on the low settings. The Alias HID light, which weighs only 0.84 pounds, carries a limited lifetime warranty.