Milwaukee M12 replacement batteries (XC 48-11-2411, 48-11-2401, MIL-12A-LI) are designed for 12V cordless tools. The 3.0Ah, 6.0Ah, and 9.0Ah variants balance runtime, weight, and cost. Choose 3.0Ah for lightweight tasks, 6.0Ah for moderate use, and 9.0Ah for heavy-duty applications. Always …