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Description:Power: Li-ion battery 3.7V, 2.4Ah Charging duration: ≤8h Working duration: ≥13h Working current: ≤180mA Luminance: after 11h, ≥350 lux Secondary bulb: enable maximum working duration for 120h LED longevity: ≥1,000h Battery longevity: after 500 times Recharging: ≥80%C Explosion-proof form: exs I Explosion-proof certificate number: KD0410 Coal mining safety certificate number: 20046466 Weight: 150g Packing: 24 wrap packs/box/8kg