Presenting INVARED 500+, the next generation tubular battery designed specially to withstand long and frequent powercuts and requiring very low maintenance. FEATURES: More than 20% extra electrolyte which means lesser topping-up frequency and better thermal management. Tubular Technology Minimum maintenance Electrolyte level indicator Suited for frequent and long powercuts Deep cycle design (600-700 cycles at 80% D.O.D) Abuse resistant Faster Recharge Operating sp.gr. 1.250± 0.005 at 27°C