12V200AH solar battery deep cycle is maintenance free Fully use the internal space of battery to increase the capacity of battery without changing the volume of battery .This is to say, users may have a large output power and capacity of battery after choosing the proper capacity of battery .We offer them the most economical products. Long service life As high quality multiple alloy electrode plate and unique electrolysis are adopted, the service life floating battery under normal temperature mach over 3 years and the service life of floating battery under 20;C may reach 5 to 10 years. Low self-discharge speed the unique electrolysis makes the battery usable directly without recharging after storage of six months under normal temperature and one year fewer than 20;C. Deep discharge protecting the battery may be recharged within 30 days when being deeply discharged or any fault occurs to the machine. All-sealed & maintenance-free No maintenance is required during the whole operation period. All pores of the cell are closed to avoid the incoming of oxygen in the air. The safe valve on the pore will be opened automatically to release the internal pressure after being over charged, and be closed again. Explosion-proof design a safety valve and a special filter prevent the chance of battery explosion and ensure complete safety in normal use. Application scope Alarm system, emergent illuminations system, post and telecommunication electronic system, UPS and computer back-up power source, fire-fighting and safeguard system, medical equipment, solar system ,shipping equipment ,control equipment ,and environmental electric bicycle, etc. Standard Export Carton with pallet packing