These batteries are designed to operate in partial charged conditions even in the non sunny days. Micro porous ceramic vent plugs with water level indicators. Due to the low antimony content the batteries are easier to maintain. Low rate of self discharge – Designed cycle life at C10 discharge ( at 27øC,1.80 VPC ). Ideal for cyclic applications due to superior voltage and energy output profile. Excellent Ampere ? hour and Watt-hour efficiency.