BlackWater 3000  Rechargeable 13.2 volt 3.8Ahr Nickel-Metal Hydride Battery, weighs 31% less than comparable NiCad systems, allows up to 31% longer burn times and 33% shorter recharge time.  3 light levels: 12 to 32 watts  Burn times: 3:15 hours @ 12 watts, 2:00 hours at 20 watts, 1:20 hours @ 32 watts.  Plug-N-Forget charging system.  Soft Wrist Mount for putting the light where you need it and reducing the "backscatter" effect.  Rated to 500 ffw.  System weight: 2.1 pounds for mount lighthead and battery (1/2 pound negative in water).