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Built-in cooling fan and Built-in CPU, analyses battery condition via memory chip in the battery, and controls current, voltage and temperature of individual cells within the battery to produce optimum and fast charging. Charging times for:- BL 5Ah - 45 Minutes BL1840 4Ah - 36 Minutes BL1830 3Ah - 22 Minutes BL1430 3Ah - 22 Minutes BL1415 1.3Ah - 15 Minutes • Overall Height 84mm • For Use With BH1220; BH1222C • Charging Time 15-45min. • Charging Current 9.0A • Overall Width 190mm