i use the i70 striker hid model with the 22amp lithium its a bit pricey at £250 quid but worth every penny works with a 35 watt xenon bulb ballast in the bottom looks like a cordless drill lol but light weight and you can screw the blitz head straight on good bit of kit makes the ordinary 170 look like a torch been out last night for about 6 hours and still plenty juice in the battery only draws 3amp or thereabouts