... 2.Safe and explosionproof 3.Long using time lead acid battery CHARACTERISTICS: -Safety and explosion-proof,-Wide operation ... Maintenance free,adding battery acid is unnecessary, -FM serie valve Maintenance Free Lead-Acid Battery Charge for autos.CAUTION : lead acid battery 1.Avoid short ... battery terminal, 8.Make regular examination and use it in the valid date, 9.Do not recharge(omitted if rechargeable ...