... 60 hours. This light have lithium battery inside, set a protecting circuit for over-charge, over-discharge, over-heat, ... to carry, improve work efficiency. Model Unit KL4LM KL5.5LM Rated Voltage. V V 3.7 3.7 Rated capacity ... . V V 3.7 3.7 Rated current. A A 0.15 0.15 Illumination at 1m Start lighting ... > 1000 Battery Service life Times > 500 > 500 Charge current A 1 1 Charge voltage V 5 5 Net weight KG ...