Milwaukee M18 18-Volt Lithium-Ion High Output Starter Kit with 6.0 Ah Battery and Charger. The M18 REDLITHIUM HIGH OUTPUT XC6.0 Battery Packs provide 50% more power and run 50% cooler than the M18 REDLITHIUM XC battery packs. The optimized combination of battery pack and tool provides unparalleled performance and run time. This kit includes a 6.0 Ah battery and charger that are essential for your M18 tools.