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This 4000mAh, 3.7V Lithium Ion battery, derived straight from the latest mobile telephone battery technology, gives a runtime of up to 8 hours. Charging via a Micro USB. The battery has a built-in fuel gauge with LED indicators making it easy to check fuel levels visually. Charges from empty in 5 hours. The battery is supplied with a Micro USB charge cable, plug not supplied. Please note this upgraded battery available from April 2023. Previously the battery required the charging dock and did not have the Fuel gauge.