4AH 18V For Milwaukee M18 Lithium High Capacity Battery XC 4.0Ah 48-11-1890 NEW | eBay
Amazon.com: KS smithy Battery Mount Holder Magnetic Compatible with The Milwaukee M18 (8-12ah),(5-6ah),(3-4ah), (No Battery),Mounted to Steel Surface with Magnets, Removable (MWK 18V3) : Tools & Home Improvement