THERMA-TECH™ HEAT MANAGEMENT – Minimizes heat for maximum runtime POWER IQ – Intelligent power management monitors and optimizes each cell for overload protection and higher power SHOCK, DROP, AND ELEMENT RESISTANT – Shock-resistant design and epoxy-sealed electronics PATENTED DUAL-SIDED FUEL GAUGE – Quickly view battery charge from multiple angles FLEX 24V CROSS COMPATIBILITY – Compatible with all FLEX 24V chargers and tools. FASTER CHARGING – Fully Charges in little as 15 minutes THE FLEX STACKED LITHIUM ADVANTAGE – 200% more power with 24V lithium, 300% longer runtime with THERMA-TECH™ heat management, 100 % faster charging; 100% cross-compatible with all FLEX 24V tools and chargers.