Bosch Professional 18v Li-ion CoolPack Battery 5.0Ah 1600A002U5 Twin PackThe Bosch 1600A002U5 18v CoolPack 5.0Ah Battery gives the user a further 25 increase in runtime over the established 4.0Ah CoolPack battery. Bosch state that their CoolPack technology increases the working life of these lithium-ion batteries by up to 100 against standard lithium-ion batteries in the market. Can be used across the full range of 18v Bosch professional power tools.Supplied as a pack of 2.FEATURESUnique CoolPack Design with advanced heat conductive housing that keeps the battery cooler, lives up to 2x longerIntegrated fuel gauge for fast and easy charge statusCold weather operation means the battery will work down to -4FDurable housing survives 3m dropFlexible Power System works with all Bosch 18 V Lithium-Ion toolsSPECIFICATIONBattery Capacity 5.0AhBattery Chemistry Lithium-IonBattery Voltage 18vHeight 2.25Length 4Width 2.75