Milwaukee REDLITHIUM batteries are the next generation in Lithium-Ion technology. Compatible with all products in the M12 Cordless tool system. REDLITHIUM battery packs will provide unmatched runtime, performance and durability for the professional tradesman. M12 REDLITHIUM 4.0 provides up to 2X more run-time, 20% more power and 2X more recharges than a standard Lithium-Ion battery. REDLITHIUM 4.0 also delivers best-in-class performance in extreme job-site conditions. With Milwaukee durability built-into each pack, the REDLITHIUM 4.0 battery operates cooler and performs in climates below minus 18C/0F with fade free power. Includes: M12 charger (48-59-2401), M12 REDLITHIUM XC4.0 extended capacity battery pack (48-11-2440) Provides up to 2X more run time REDLITHIUM 4.0 battery operates cooler and performs in climates below 0 with fade free power M12 Red lithium M12 12V 4.0 Ah Battery Starter Kit One M12 4.0 Red Lithium Battery 48-11-2440 Included One M12 Battery Charger 48-59-2401 Included