For MILWAUKEE For M18 Cordless LITHIUM-ION System Tools. Battery Composition:Lithium-Ion. Charging the battery, the green light flashes. The battery full of charging, it will bright green light. 2603-22CT, 2601-21, 2615-20, 2602-22DC, 2606-20, 2604-22CT, 2706-20, 2704-22, 2788-22, 2702-22CT, 2701-22CT, 2707-20, 2708-20, 2607-22CT.
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