Miner's Lamp: 1. LED 2. Voltage: 3.7V 3. Battery: ... Lighting Time: >20 hours Product Features:a. Model meaning: K - Miner lamp, L - Lithium battery, 5 - 5Ah---battery capacity, L - ... LED illuminant, M - Maintenance freeb. The green light in lamp head will auto-change to red when the charging is ... share rack charger with the lead-acid-battery miner lamp because of a highly integrated control chip in the ...