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 equivalant 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 charges in 120 minutes. A lower capacity 2.0Ah (86Wh) battery is also available (MBT4820Li). The battery charger is not included this can be purchased separately.