M18 18-Volt Lithium-Ion High Output 6.0 Ah and 3.0 Ah Battery (2-Pack)The MILWAUKEE M18 REDLITHIUM HIGH OUTPUT XC6. 0 and CP3. 0 batteries provide 50% more power and runs 50% cooler vs other M18 REDLITHIUM XC and CP battery packs. The optimized combination of size and increased power provides a great solution for the entire range of M18 products. Milwaukee M18 REDLITHIUM batteries deliver fade free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and