Kobalt 40-Volt Max 15-in Straight Cordless String Trimmer (4ah Battery and Charger Included)

What It Is

This is a complete cordless string trimmer kit from Kobalt, including the 40-volt max 15-inch straight shaft trimmer, a 4Ah battery, and a charger. It’s designed for medium-duty trimming around lawns, edging along driveways, and clearing light weeds—no gas or cord needed.

Fitment & Compatibility

• Battery platform: Only works with Kobalt 40-volt max tools and chargers (not 80-volt or 24-volt lines).
• Trimmer head: Accepts 0.080-inch or 0.095-inch diameter trimmer line (bump-feed head).
• Shaft type: Straight shaft—better reach under bushes but requires more clearance than curved shafts.
• Deck size: Not deck-specific; fits any residential lawn up to about 1/3 acre on a single 4Ah charge.
• OEM vs aftermarket: This is OEM Kobalt. Aftermarket 40V batteries may fit but often lack the same runtime or safety circuitry.
• What to check before buying: Ensure you have a Kobalt 40V charger (included) or that your existing charger supports 40V batteries. Measure your yard size—if over 1/2 acre, you may need a second battery.

Key Things to Know

• Quality: Solid build for the price; the 4Ah battery gives 30-45 minutes runtime on high speed. Plastic bump head is common failure point after heavy use.
• Installation: Minimal—attach the guard, adjust the handle, and charge the battery. No tools required.
• Common gotchas: The trimmer head doesn’t accept thicker line (0.095” max). Bump-feed can jam if line is wound too tightly. Battery takes 2-3 hours to fully charge.
• Maintenance: Keep the guard clean to prevent grass buildup; store battery indoors in winter to extend life.

Should You Buy It

Buy this if you have a small to medium lawn (under 1/3 acre), already own other Kobalt 40V tools, and want a no-gas, no-cord trimmer with decent runtime. Skip it if you need heavy-duty commercial use, have a large property, or prefer a curved shaft for edging.