Cordless String Trimmer Compatible with Milwaukee M18 18V Battery, 12-Inch Weed Wacker Cordless, Auto Line Feed, Electric Weed Eater Battery Powered, Grass Trimmer w/ 6 Line Spools (Tool Only)

What It Is

This is a cordless string trimmer head (tool only) designed to run on Milwaukee M18 18V batteries. It replaces a gas or corded trimmer for light-to-medium lawn edge and grass cutting tasks, with a 12-inch cutting swath and automatic line feed.

Fitment & Compatibility

• Battery required: You must already own a Milwaukee M18 18V battery and charger—this is a bare tool. It is not compatible with M12, Ryobi, DeWalt, or other battery platforms.
• Deck size: The 12-inch cutting width works best for small to medium yards (under ½ acre). It will not cover large properties efficiently.
• Line system: Uses pre-wound spools (6 included). Do not attempt to use standard bulk trimmer line—the auto-feed mechanism is designed for these specific spools.
• Mounting: Standard head attachment fits most universal trimmer shafts, but check the shaft diameter (typically 0.75" to 1") and locking pin alignment before purchase. If your current trimmer is a brand-specific system (e.g., Echo Speed-Feed), it may not attach without an adapter.

Key Things to Know

• Auto line feed is reliable but can jam if you bump the head hard on pavement. Clear debris before reloading.
• No speed control—it runs at a fixed RPM. Fine for light weeds but struggles with thick brush or tall grass.
• Installation is tool-free on most shafts (just twist-lock), but some older trimmers require a hex key or screwdriver to swap heads.
• Line spools are proprietary—you must buy Milwaukee spools (or compatible aftermarket). They cost around $10 for a 3-pack. Bulk line will not work.

Should You Buy It

Buy this if you already have Milwaukee M18 batteries and need a lightweight, battery-powered trimmer for small yards, edging, or quick touch-ups. Skip it if you have a different battery system, need heavy-duty cutting, or prefer using standard bulk trimmer line.