Osaka 1.8kWh AGM Battery 12V (6-FMX 150 B)

Note: Sealed AGM VRLA - no topping up, no acid fumes, safe to install indoors, and it can be laid on its side. The trade-off is depth: Osaka publish the cycle life as a curve, not a single number - 1600 cycles at 20% depth of discharge, 1000 at 50%, and only 700 at 80%. The usable figure here is taken at 50%, the middle of that curve and the depth VRLA is normally sized around, which is why a sealed battery of the same nameplate gives you less usable energy than a tubular one. Gas recombination is better than 96%, self-discharge under 3% a month at 25°C. Charge at no more than 0.2 × C10 (0.15 × C10 recommended). Built to IEC 60896-21 and -22, ISO 9001 and ISO 14001. Front-terminal design, so connections and inspection are at the front - it racks into a 19-inch or 23-inch cabinet and needs no headroom above it. Capacity is quoted at the 10-hour rate, not the 20-hour rate most consumer batteries use, so it is a more conservative number than it looks. Float 13.50 V, cycle 14.10 V. Design life 7 years on float in a temperature-controlled room. Discharge -40°C to +50°C, charge -20°C to +45°C. Osaka publish no price list online for this range - the figures worth chasing from a dealer are price and manufacturing date, since a VRLA that has sat on a shelf loses capacity. Osaka is made by Pakistan Accumulators (Pvt) Limited, part of ACM Group, at Industrial Estate Hattar in Haripur - the same plant that makes Volta, on the same moulds. The Volta equivalent of this battery is a physically identical product in different livery, so compare the two on price and dealer support rather than on specification.