There’s something uniquely satisfying about edging your lawn—clear lines, crisp borders, and that sense of accomplishment when the job’s done. Yet, too often, a string trimmer can turn that satisfaction into frustration: snarled lines, sputtering motors, or batteries dying mid-task. Over eight years trimming private gardens and public greenways, I’ve tested countless cordless string trimmers. Today, I’ll share the top five models that deliver on power, runtime, and ease—no fluff, just honest insights.
What This Guide Covers
- The five best cordless string trimmers of 2025 and why they stand out.
- Real-world performance: power, runtime, comfort, and durability.
- Simple upkeep tips to keep your trimmer humming along.
- Who each model is best for—beginners, budget-minded gardeners, and pros.
Why Choose a Cordless String Trimmer?
Cordless models have matured. Gone are the days of underpowered battery tools. Today’s brushless motors deliver torque rivaling gas engines, while smart batteries know when to protect themselves from overheat or overdischarge. You get full freedom—no cords to trip over and no gas to mix—plus the ability to move seamlessly around trees, flower beds, and hardscape.
Side-by-Side Comparison: Top 5 Models
| Model & Power Type | Cutting Width | Battery | Max Runtime | Weight | Price Range |
|---|---|---|---|---|---|
| EGO Power+ ST1521S (56V) | 15″ | 56V | 45 min | 12.0 lb | $$$ (~$299) |
| Makita XRU23Z (Dual 18V) | 17″ | 2×18V | 60 min | 6.6 lb | $$$ (~$249) |
| Greenworks 21332 (24V) | 13″ | 24V | 30 min | 5.5 lb | $$ (~$129) |
| Black+Decker LST311 (40V) | 11″ | 40V | 30 min | 6.3 lb | $$ (~$139) |
| DeWalt DCST920P1 (20V MAX) | 13″ | 20V | 30 min | 6.0 lb | $$ (~$159) |
Price ranges: $ = Budget, $$ = Mid, $$$ = Premium
Deep Dive Reviews
1. EGO Power+ ST1521S: The All-Rounder When I first clipped in the 56V battery, the ST1521S felt solid in my hands. The 15″ dual-action blade chewed through thick crabgrass and tough vines without bogging down. The Rapid Load™ head makes reloading line almost fun—pop off the cap, drop in fresh line, snap back on. At 12 pounds, it’s not featherlight, but the vibration-dampening grip keeps my wrist comfortable even after half an hour.
Performance Highlights
- Cutting power: Consistent through thick and thin, no lag.
- Battery life: Full job on my quarter-acre yard—about 40 minutes.
- Noise level: 90 dB—noticeable but tolerable with ear protection.
Pros: Tool-free line reload; reliable brushless motor; rugged build.
Cons: Pricey; heavier than some alternatives.
Maintenance Tip: Clean the line head after each use—grass and sap hide in crevices and lead to jams.
2. Makita XRU23Z: The Marathon Runner I’ve never seen a battery-powered trimmer last so long. Two 5.0Ah batteries in series carried me through a full 60-minute session of tall fescue and ornamental grasses. With a 17″ swath, I covered more ground in fewer passes. The best part? At 88 dB, it’s surprisingly quiet; I trimmed before dawn without waking the neighbors.
Performance Highlights
- Run time: Up to 60 minutes on medium load.
- Ergonomics: Balanced, at just 6.6 pounds.
- Feed system: Auto-feed head—hold the trigger, and line advances automatically.
Pros: Extended runtime; whisper-quiet; broad cutting width.
Cons: Batteries sold separately; slight vibration at full throttle.
Maintenance Tip: Rotate batteries front-to-back halfway through work to maintain balance.
3. Greenworks 21332: The Featherweight Hero This little 24V trimmer felt so light I nearly forgot I was holding it. Ideal for edging around flower beds and pathways, the pivoting head clicks into edger mode in seconds. The 13″ cutting width means more passes, but the agility in tight spaces more than makes up for it.
Performance Highlights
- Weight: 5.5 pounds—no arm strain.
- Versatility: 2-in-1 trim and edge function.
- Feed system: Bump-feed; easy once you find the rhythm.
Pros: Ultra-light; inexpensive; perfect for small yards.
Cons: Shorter runtime; not for dense brush.
Maintenance Tip: Store the battery at around half charge in a cool, dry place.
4. Black+Decker LST311: The No-Fuss Trimmer For about $139, you get a 40V trimmer with an auto-feed spool—no bumping or threading line. The 11″ head makes it great for detail work along borders and patios. At 6.3 pounds, it’s manageable, though it struggles with thick weeds.
Performance Highlights
- Auto-feed: Reliable line delivery with zero fiddling.
- Control: Adjustable pivot head for angles.
- Ease of use: Battery and charger included—ready out of the box.
Pros: Auto-feed convenience; budget-friendly; compact.
Cons: Limited torque; shorter battery life under heavy load.
Maintenance Tip: After use, flip to edge mode and run briefly to clear any clippings from the pivot joint.
5. DeWalt DCST920P1: The Tough Midranger With a reputation for durability, DeWalt’s 20V MAX trimmer combines a sturdy frame with a brushless motor. The 13″ cutting path balances speed and control, and I appreciated the trigger lock for safety when moving between spots.
Performance Highlights
- Build quality: Solid, metal gear case.
- Safety feature: Trigger lockout.
- Balance: Even at 6 pounds, it feels stable.
Pros: Durable; safety-minded; decent power.
Cons: No auto-feed—bump required; average runtime.
Maintenance Tip: Keep the gear housing clean—dirt can sneak under and affect performance.
Who Should Pick Which Trimmer?
- New Gardeners & Small Yards: Greenworks 21332—simplest, lightest option.
- Budget-Minded Buyers: Black+Decker LST311—auto-feed ease at low cost.
- Yard Enthusiasts: DeWalt DCST920P1—built tough with safety features.
- Large Lawns & Early Birds: Makita XRU23Z—long runtime, quiet operation.
- Power Seekers: EGO Power+ ST1521S—premium cordless strength.
Easy Upkeep Tips
- Linen and blades: Replace line or sharpen blades every 8–10 hours of trimming.
- Battery care: Store at 40–60% charge, away from extreme temperatures.
- Cleaning: After each use, remove debris from head and pivot points.
- Auto-feed heads: Clear spool area monthly—grass bits collect fast.
FAQs & Insights
Q1: How long will my battery last?
Expect 30–60 minutes per charge. Higher-voltage models like 56V give the longest runtime, while 20V–24V units average 30 minutes.
Q2: Can I use the same battery on other tools?
Often yes—brands design batteries to power saws, blowers, and trimmers. Always confirm voltage and series compatibility.
Q3: Why does my trimmer head jam?
Debris buildup and dull line are usual suspects. Clean the head after each use and keep line tension correct.
Q4: What safety gear is non-negotiable?
Goggles, gloves, sturdy shoes, and ear protection protect you from debris and noise.
Q5: When should I recharge?
Charge immediately after use. Avoid letting batteries drain completely to prolong life.
Q6: Why does my trimmer bog down on thick grass?
You need more torque—look for higher-voltage models or dual-action blades; lightweight trimmers trade power for ease.
Social Proof:
“The EGO ST1521S powers through brush like a champ—no gas smell!” ★★★★★
“Makita’s runtime is insane, and it’s quieter than my leaf blower.” ★★★★☆
Ready to transform your yard work? Choose your perfect cordless companion and enjoy cleaner cuts, less fuss, and a yard you’ll love to show off. Happy trimming!