Model Number: LPS2-400 Key Specifications/Special Features: General featuresGood cyclic property. Enhanced overcharge endurance and over-discharge recovery propertyHigh purity raw material: ensure low self discharge rateUsing oxygen recombination technology: maintenance-freeLower acid density, excess of electrolyte and larger distance between plates to keep battery at lowtemperature and slow down plate grid corrosion speedABS material: increase the strength of battery container. (Flame-retardant ABS is optional)Unique plate group configuration, high quality AGM separator and battery management system ensure battery with a longer service lifeSpecial vent valve design: control water losing, prevent air and spark going inside