This 6 Amp charger offers the most versatility for all charging needs. All Lithium-Ion batteries within our 12V MAX, 20V MAX, and FLEXVOLT 20V/60V MAX battery range are compatible with this charger. The new Stage 1 and Stage 2 LED indicators communicate more about the battery's state of charge than those without. The Stage 1 LED blinks until the battery is approximately 80% charged. It then stays solid and the Stage 2 LED blinks until the battery is fully charged. The 6 Amp charger also features through-hole mounts, secure latching, and double insulation.