Maximum Number of Batteries Charged at Once: 6. Charges up to six batteries sequentially Convenient carrying handle Pass through plug Compact size Compatible with all M18 batteries. Milwaukee 48-59-1806 M18 Lithium-Ion 6-Port Sequential Battery Charger 5x Milwaukee M18 Red Lithium XC 5.0AH Battery Packs. The Battery charger and packs are in fairly good condition that have moderate wear and tear and are quite dirty. The battery charger and all batteries have been tested and none have any issues.