Light & Motion Stella 200 Headlight Li-ion Bright solid state LED emitters provide Lumens of: High - 200, Med - 100, Low - 50 Run time: High - 3:15 hrs, Med - 6:30 hrs, Low - 13:00 hrs, Flash - 100+ hrs Powered by a 2 Cell Li-Ion battery. Low battery warning. 5 hour charge time with Li-ion smart charger (included). Turns itself off when finished 2 cell Li-ion pack is easily carried in a jersey pocket, hydration pack, or strapped on a top tube or seat post. Handlebar and helmet mount included Battery weight: 156g Total system weight: 216g.