The Milwaukee M18 Redlithium High Output Xc6.0 Battery 2-Pack System Starter Kit includes two batteries and an M18/M12 Battery Charger. The M18 Redlithium High Output Xc6.0 Battery Packs provide 50 percent more power and run 50 percent cooler than the M18 Redlithium Xc battery packs. The optimized combination of size and increased power provides a great solution for the entire range of Milwaukee M18 products. It delivers fade-free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before. The M18 Redlithium High Output Xc6.0 provides increased power in extreme cold weather conditions (below 0F / -18C) and delivers more work per charge, driving corded replacement on the jobsite. The Redlithium High Output Xc6.0 battery is fully compatible with over 200 M18 solutions.