MBT4840Li 4Ah Lithium-Ion Battery Freedom48.4.0Ah battery charges in 120 minutes.At the heart of the Freedom48 range, are our class leading 48V Lithium-Ion batteries. With lightweight, high performance cells delivering long running times. They have no memory effect - so the power doesn't fade in use - allowing you to work over long periods, just as you would with a petrol powered tool.With an extremely long battery lifetime - delivering over 85% of it's original capacity after 1000 charges, and low running costs - typically less than 10% of the cost of using the equivalent petrol powered machine, the batteries are extremely efficient and cost effective. This is our largest capacity 4.0Ah (173Wh) battery, delivering the longest running times. The 4Ah battery in charges in 120 minutes. A lower capacity 2.0Ah (86Wh) battery is also available (MBT4820Li).