The ATLAS™ 40V/80V Dual Voltage Rapid Battery Charger uses Advanced Fan-Cooled Rapid Charging Technology to deliver exceptionally fast charge times. The charger can bring a fully depleted 40V 2.5 Ah battery to 90% charge in as little as 30 minutes. 5.0 Ah 40V/80V batteries charge to 90% in 45 minutes. The ATLAS™ 40V/80V battery platform performs better than gas – no dangerous fumes, no gas and oil mixing, no engine maintenance.