... 4)weight:450g 5)Charge-Discharge Cycle:>=500times ApplicationKL4LM mining lamp is suitable to coal mine well with explosive gas containing ... corrosion,maintance free,use- cost low ;2,The product is portable, composed of head light,cable ,storage battery. there are two ... Safety Performance Requirement of Mining Lamp: GB9757-20032, KL Type Mining Lamp: MT927-20043,KL4LM Type Mining Lamp:Q/DG.018-2007 ...