The KATANA 18V Charge-All 4Ah Li-Ion Battery is designed to work with all KATANA cordless power tools. The 4Ah battery has a recharge time of 120 mins and is compatible with all KATANA Charge-ALL battery (sold separately). All KATANA Charge-All batteries have an inbuilt LED charge indicator and come with a 3 year warranty. The 4Ah battery offers longer tool run-time compared to the 2Ah version.