BLACK+DECKER 20V MAX 12 Inch Weed Eater Cordless String Trimmer and Wheeled Edger Lawn Tool with Spool, 2.5Ah Battery and Charger Included, Lightweight, 2 Speed PowerDrive (LST522)

What It Is

This is a complete cordless string trimmer and wheeled edger system from BLACK+DECKER, powered by a 20V MAX 2.5Ah battery and charger. It’s designed for light-to-medium trimming and edging around lawns, sidewalks, and garden beds.

Fitment & Compatibility

• Battery platform: Uses BLACK+DECKER 20V MAX batteries (not compatible with 20V MAX* or other brands). The included 2.5Ah battery works with any BLACK+DECKER 20V MAX tool.
• Trimmer head: Accepts 0.065-inch diameter replacement spools (OEM part #AF-100 or universal equivalents). Do not use thicker line.
• Edger wheel: Integrated wheel is non-removable; designed for wheeled edging only (not a stand-alone edger).
• Model-specific: Only fits the LST522 trimmer/edger. Not compatible with other BLACK+DECKER trimmers or edgers without the same wheeled design.

Key Things to Know

• Battery life: 2.5Ah battery gives about 20–30 minutes of runtime on high speed; keep a spare battery for larger yards.
• Installation: No tools needed—spool replacement is tool-free but can be tricky; watch a quick video to avoid tangling.
• Common gotcha: The feed mechanism can jam if you bump the head too hard or use the wrong line diameter. Stick to 0.065-inch line.
• Quality: Plastic housing is lightweight but less durable than metal; avoid hitting hard surfaces repeatedly.

Should You Buy It

Buy this if you have a small to medium lawn (under ¼ acre) and want one tool for both trimming and wheeled edging without buying a separate edger. It’s a solid value for the price, but if you need heavy-duty performance or longer runtime, consider a higher-voltage model or a gas alternative.