20V Cordless String Trimmer, 2.0Ah Battery Powered with Fast Charger, 12'' Grass Cutter with Auto Line Feed, 3-in-1 Electric Lawn Mower Grass Trimmer & Edger Lawn Tool with 8 Lines for Yard, Garden

What It Is

This is a 20V cordless string trimmer kit (battery, charger, trimmer head) designed for light-duty lawn care—trimming grass along edges, fences, and around obstacles. It’s not a replacement for a gas or high-voltage trimmer; it’s for small to medium yards and touch-up work.

Fitment & Compatibility

• Battery/Charger: The included 2.0Ah battery and charger are proprietary to the “Fast” brand. They will not work with other brand tools (e.g., Ryobi, DeWalt, Greenworks). If you already own Fast-branded tools, this battery is compatible.
• Trimmer Head: Accepts 0.065" to 0.080" diameter trimmer line (pre-cut 8-line spool included). The auto-feed head is pre-installed—no aftermarket head needed. Line replacement uses a standard bump-feed or pre-cut line system.
• Deck/Attachment: This is a standalone trimmer/edger, not a mower attachment. It converts from trimmer to edger by rotating the head (press button, twist 90°). No deck or mower compatibility required.
• Measurements: Cutting swath is 12 inches. Shaft length is fixed (not adjustable). Check your yard size—battery runtime is ~20–30 minutes on a full charge (2.0Ah). For larger yards, you’ll need a second battery.

Key Things to Know

• Battery Life: The 2.0Ah battery is small. Expect 20–30 minutes of continuous trimming. If your yard is over 1/4 acre, you’ll likely run out before finishing. Consider buying a second 2.0Ah or 4.0Ah battery (Fast brand only).
• Auto Line Feed: Works well with pre-cut lines (8 included). If you use bulk spool line, it may jam. Stick to pre-cut or 0.065" line to avoid feed issues.
• Edger Mode: The head rotates, but the guard stays fixed. You’ll need to tilt the trimmer to edge—not as precise as a dedicated edger. Fine for light curbs and sidewalks.
• Assembly: Minimal—attach guard, screw on handle. Takes 5 minutes. No tools needed. Check all screws are tight before first use; some users report loose handle bolts.

Should You Buy It

Buy this if you have a small lawn (under 1/4 acre), need a basic trimmer/edger for light weekly maintenance, and don’t already own a compatible battery system. Skip it if you have a large yard, want heavy-duty cutting (thick weeds, brush), or prefer a trimmer that shares batteries with other tools (e.g., Ryobi, DeWalt). The low price and auto-feed convenience make it a good budget option for casual use.