Milwaukee M18 18-Volt Lithium-Ion Starter Kit with One 9.0 Ah Battery and One 5.0 Ah Battery and Charger

The M18 REDLITHIUM HIGH DEMAND 9.0 Battery Pack delivers up to 5X more run-time, 35% more power, and runs 60% cooler than standard 18-Volt lithium-ion batteries. The battery is best optimized for high draw products and sustained run-time applications, and it provides the next, large step towards full corded replacement when paired with the M18 system of solutions. It maintains full power and runs substantially cooler through heavy applications, allowing users to push their cordless tools harder and longer than ever before. The M18 REDLITHIUM HIGH DEMAND 9.0 battery is fully compatible with 175 plus M18 tools.