EGO ST1511T vs ST1521S: My Surprising Verdict

I’ve used both for years. And here’s the truth—it all comes down to one thing: comfort or power.

These trimmers are strong. They run on battery but work like gas. You won’t miss your old gas tool.

But here’s the deal—once you trim for 30 minutes, feel matters more than specs.

I’ve trimmed in spring, edged in summer, and cleaned up in fall. I’ve faced thick weeds, crabgrass, and tight flower beds. My yard throws it all at me.

After years of hands-on use, I know what works. I’ll help you pick the one that fits you.

Detailed Comparison — EGO ST1511T vs ST1521S

I’ve used both the EGO ST1511T and ST1521S for all kinds of trimming—from sidewalk edges to thick weeds. While they look similar, they feel very different. Let’s break down the key features to help you choose the right one.

Blade Length: EGO ST1511T vs ST1521S

Both trimmers have a 15-inch cutting swath. That’s wide enough for most yards. But the ST1521S sometimes leaves a tighter cut, likely due to the head shape.

Feature	ST1511T	ST1521S
Cutting Width	15 inches	15 inches (feels like 14″)
Line Type	Dual-feed, spiral 0.095″	Dual-feed, spiral 0.095″
Swath Feel	Wide and smooth	Tight and precise

Rating:
ST1511T: 9/10
ST1521S: 8.5/10

Cutting Power: EGO ST1511T vs ST1521S

Both use the same brushless motor and chew through weeds with ease. But the ST1521S feels more firm in tough spots.

Feature	ST1511T	ST1521S
Motor	Brushless	Brushless
Speeds	2-speed switch + trigger	Single-speed variable
Power Feel	Strong with control	Strong and steady

Rating:
ST1511T: 9/10
ST1521S: 9.5/10

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Battery Life: EGO ST1511T vs ST1521S

Both come with a 2.5Ah battery. But the ST1511T’s low-speed mode gives it the edge on light jobs.

Feature	ST1511T	ST1521S
Battery	56V 2.5Ah	56V 2.5Ah
Run Time	Up to 45 mins (low speed)	30–40 mins
Efficiency	High on low speed	Less control over drain

Rating:
ST1511T: 9.5/10
ST1521S: 8.5/10

Handle Comfort and Grip: EGO ST1511T vs ST1521S

This is where the ST1511T shines. It fits better and adjusts fast.

Feature	ST1511T	ST1521S
Handle	Tool-free adjustable	Fixed (needs a screwdriver)
Shaft	Telescopic aluminum	Fixed carbon fiber
Fit for Height	Easy to adjust	One-size-fits-most

Rating:
ST1511T: 10/10
ST1521S: 8/10

Weight and Balance: EGO ST1511T vs ST1521S

They’re both under 8 lbs, but the balance makes a big difference.

Feature	ST1511T	ST1521S
Weight	7.63 lbs	7.28 lbs
Battery	Included (2.5Ah)	Included (2.5Ah)
Balance	Easy to adjust	Heavier feel during use

Rating:
ST1511T: 9/10
ST1521S: 8/10

Noise Level: EGO ST1511T vs ST1521S

Both are quieter than gas trimmers. But one has a softer tone.

Feature	ST1511T	ST1521S
Noise Level	~70 dB	~70 dB
Sound	Softer on low speed	Louder at full power

Rating:
ST1511T: 9.5/10
ST1521S: 8.5/10

Ease of Use: EGO ST1511T vs ST1521S

Both trimmers are easy to set up and load line. But one is more flexible.

Feature	ST1511T	ST1521S
Line Loading	POWERLOAD	POWERLOAD
Adjustable Shaft	Yes	No
Setup	Minimal	Minimal

Rating:
ST1511T: 10/10
ST1521S: 8/10

Value for Money: EGO ST1511T vs ST1521S

The price difference is small, but the features guide your choice.

Feature	ST1511T	ST1521S
Price (Kit)	$199–$219	$229–$249
Warranty	5 years	5 years + lifetime shaft
Extras	Telescopic shaft	Carbon fiber shaft

Rating:
ST1511T: 9.5/10
ST1521S: 9/10

Final Verdict: EGO ST1511T vs ST1521S

Both are strong tools. It depends on what you care about most.

Category	ST1511T	ST1521S
Best For	Comfort and fit	Durability and power
Runtime	Longer	Good, but less efficient
Long-Term Perks	5-year warranty	Lifetime shaft + 5-year tool

Overall Rating:
ST1511T: 9.5/10
ST1521S: 9/10

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Handle Comfort vs. Cutting Power: What Matters More?

Over the years, I’ve learned this the hard way—comfort lasts longer than power. When you trim for more than 20 minutes, it shows. The ST1521S is tough. I like the carbon shaft. It’s strong and doesn’t bend. It feels like pro gear. But after edging the full length of my driveway, my shoulders start to feel it. That weight doesn’t move, and it adds up.

The ST1511T feels lighter. It may not be built like a tank, but it fits me better. I drop the shaft low when I edge, then lift it up a bit to trim around trees. That little change helps more than you’d think. After one long spring cleanup last year, my back felt fine the next day. I give credit to that adjustable shaft.

When you use a tool each week, year after year, comfort starts to win. Power fades. But ease stays.

Tips for Getting the Best Results

• Keep a backup spool of 0.095″ line on hand—don’t wait until you run out mid-job.
• Use low-speed mode (ST1511T) when trimming around flower beds, mulch, or garden edges.
• Retract the shaft on the ST1511T before storing—it saves space in sheds or garages.
• Invest in a padded shoulder strap. Even though both trimmers are under 8 lbs, it helps with long trimming sessions.
• If you’re in a suburban area in the U.S., quiet operation matters. Early-morning use won’t wake the neighborhood.

Read More: STIHL vs Husqvarna Trimmer

Final Thoughts on EGO ST1511T vs ST1521S

If comfort, ease, and shared use matter most, go with the ST1511T. It’s the trimmer that works with you. I’ve used it for years, and the back relief is real—especially during spring and fall cleanups when the work piles up.

But if you want pure strength, the ST1521S is built like a tank. It feels solid in your hands, no matter the job. That carbon shaft doesn’t flex, and the lifetime warranty is a big plus. I know folks who use it all year round—and it holds up.

No matter which one you choose, both give you the same power as gas—without the noise or mess. Your lawn will look great. And you won’t waste weekends fixing pull cords or breathing in fumes.

That’s worth a lot. I’ve lived it.

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FAQs: EGO ST1511T vs ST1521S