... necessary certificate:ISO9001:2000,VDS,CE,FCC,UL HOT tubular battery 2V 200AH (4 OPzV200)General Features- Completely sealing throughout the batteries ... : please charge with 16V (maximum 16.2V) keep good ventilation. Reduce charging voltage if battery temperature rise over 45oC or charging current ... , no smoking.9. Wear goggle when change or check the battery. HOT tubular battery 2V 200AH (4 OPzV200)