Long-run 4.0Ah battery, compatible with all Kielder TYPE18 tools. High quality 18v Li-ion cells maximise run-time and provide reliable, stable performance. A charged battery will hold its charge for 12 months without being used and there is no memory effect from partial charging. TYPE18 battery and tool electronics are in-sync to optimise current and power delivery. Features LED charge level indicator and quick release button to easily remove from tool. Long run fuel tank, approximately 100% more run time than TYPE18 2.0Ah battery. High quality 18v Li-ion cells provide reliable, stable performance. Holds charge for up to 12 months, if inactive. No memory effect from partial charging. LED charge level indicator. Compatible with all Kielder TYPE18 tools. Specification Voltage: 18v Battery Type: Lithium-ion Charge Time: 75 minutes (from flat) Watt Hours: 72 Weight: 0.6kg