FLEX 24V 3.5Ah Stacked Lithium Battery THE FLEX STACKED LITHIUM ADVANTAGE - 200% more power with 24V Stacked Lithium, 300% longer battery life with THERMA-TECH+ heat management, 100% faster charging, 100% cross-compatible with all FLEX 24V tools and chargers 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 FASTER CHARGING - Fully charges in little as 15 minutes FLEX 24V CROSS-COMPATIBILITY - Compatible with all FLEX 24V chargers and tools FLEX FOUNDERS LIMITED LIFETIME WARRANTY - Register your new FLEX tool, battery, or charger within 30 days of purchase through December 31, 2022 to receive a limited lifetime warranty