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% more power and run 50% 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.