EGO POWER+ String Trimmer, Battery Powered, 15" Trimmer for Weeds and Grass with POWERLOAD and Carbon Fiber Split Shaft, Includes 56V 2.5Ah Battery and Charger - ST1521S
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Availability:
In Stock.
Arrives
Wednesday, Sep 16
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Style: w/2.5Ah Battery, Powerload
Features
- POWERLOAD technology automatically winds your trimmer line. Replacing your string line is as easy as feeding the line into the head and pressing a button!
- Carbon Fiber shaft that is stronger than any other string trimmer shaft on the market today. The shaft is equipped with a lifetime warranty so the strength and durability is guaranteed to last forever!
- Package Include 1pc 56 Volt 2.5Ah battery and 1pc standard charger. Industry leading ARC Lithium technology for incredible power and performance. Compatible with all EGO tools.
- Fan Cooled Charging System, prevents the battery and charger from overheating. 50-minute charge time from zero to full charge for the included 2.5Ah Battery. Charges all EGO Batteries.
- 5-year tool warranty, 3-year battery warranty
Description
The world's first String Trimmer with POWERLOAD Technology. This patent pending technology solves for one of the biggest pain points of string trimmers, POWERLOAD technology automatically winds your trimmer. Replacing your string line is as easy as feeding the line into the head and pressing a button! The EGO POWER+ 15" POWERLOAD String Trimmer has a Carbon Fiber shaft that is stronger than any other string trimmer shaft on the market today. The shaft is equipped with a lifetime warranty so the strength and durability is guaranteed to last forever! This revolutionary trimmer is also built with a hi-efficiency brushless motor, bump feed line advance, .095" professional cutting line, and is compatible with all EGO ARC Lithium batteries to maximize the convenience of cordless and deliver Power Beyond Belief.
Brand: EGO Power+
Power Source: Battery Powered
Color: Black
Item Weight: 7.3 pounds
Cutting Width: 14 inches
Power Source: Battery Powered
Cutting width: 14 inches
Speed: 5800 rpm
Number of Batteries: 1 Lithium Ion batteries required. (included)
Item Weight: 7.3 pounds
Item Dimensions L x W: 71.7"L x 12.6"W
Size: 15"
Color: Black
Pattern: Trimmer
Style Name: w/2.5Ah Battery, Powerload
Brand Name: EGO Power+
Model Number: ST1521S
Global Trade Identification Number:
Number of Items: 1
UPC: 692042008238
Unit Count: 1 Count
Manufacturer Warranty Description: 5 Year Limited Warranty
Included Components: String Trimmer, 56V 2.5Ah battery, 56V standard charger, Cutting Line, Hex Wrench
Item Type Name: 2.5Ah Battery and Charger Included
Manufacturer: EGO Power+
Manufacturer Part Number: ST1521S
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Sep 16
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
This Weed Wacker has been great. Plenty of cutting power. Lasts long enough. Charges fast. The powered string loading is epic. It just works. Downsides. The string that comes with this product wears fast. It's cheap but effective. The product is as heavy as an old Gas Powered wacker. Don't think the lack of gas and gas engine that it'll be any lighter.
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Reviewed in the United States on August 3, 2026 by Min
September 22, 2024 I assembled this machine on April 13, 2024 and started using it shortly thereafter. I bought it to replace my Echo SRM-225 which I have used since June 2013. I bought this particular EGO model after reading great reviews about it. Both devices are used solely at my home. As this is my first battery powered piece of lawn equipment, I wanted to see how it handled several concerns that I had upon making the switch from gasolene to battery power, the first being just how it handled generally. I have to say that it handles very well. It is noticeably lighter than my old Echo and significantly quieter. It does a very good job of cutting the grass in either standard trimming such as along a fence line as well as along mulched areas where I have to hold it upside down. As there are more mulched areas than regular in my yard this second position is important to me and the EGO does very well in both areas. I have to say however that the inverted position is a little more cumbersome to me, but not a deal breaker. The second concern was how the EGO would handle a roughly 920 square foot area beyond the back boundary of my yard that contains weeds alongside a farm field. I go back there several times each summer to clean up the area. The EGO is excellent in this wild service actually better than my gas-powered Echo. This machine really goes after it. There’s more than enough power. It did have some problems with some big (3/8” diameter) Queen Ann’s Lace that I encountered on my most recent time in the field, but for the most part it was up to the task. This is the service where it earned the “BEAST” moniker. The third concern dealt with the auto-feed feature of replacing the line. I’ve only had to do so once so far, but it worked slicker than snot. So much easier to replace than my old Echo ever was. My final concern was battery charge life. There’s more than enough charge in the battery to do my whole yard, including the wild area in the back to do everything on a single charge. It also only takes a short time to fully re-charge. I always do the trimming before running the mowers so when done I put the battery on charge while mowing. It’s always fully ready to go by the time I’m done mowing. I don’t need to keep it on charge when away from the garage. The battery holds the charge very well too. We’ve been having a drought, particularly over the last month or so and I’ve let it set for about 6 weeks. When I used it this past week there was more than enough charge to do the whole yard with no problem. I’m extremely happy with this machine.
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Reviewed in the United States on September 23, 2024 by Maintenance Engineer
I mow just under 4 acres and so far in two years I've never been able to complete all the trimming that needs to be done each week. Upgrading from a cordless Black and Decker, I am hoping this EGO trimmer is going to be a game changer in my trimming game. This evening was my first time using the EGO trimmer and so far it hasn't been the best of experiences. The line got caught up in the spindle about 15 minutes into trimming. I spent way more time than I should figuring out how to pop open the cap, take out the string and then reload the string. Reloading actually went pretty smoothly once I realized a black spring had fallen out and needed to be put back under the cap. After walking all the way back out to where I left off, the battery ran out about 5 - 10 minutes later. Just guessing but I think that battery lasted about 25 - 30 minutes total on the first charge. But in that half hour I trimmed around way more than I ever could have in a whole week with my old cordless trimmer. I put the battery back on the charger and went back mowing. I saw it was already fully charged when I parked the mower, but it was getting too dark to see to trim. I will have to try my luck with the trimmer again tomorrow. So far I am very impressed with the power of this trimmer. I find this trimmer is very well balanced when using the EGO shoulder strap with it. This is my first straight shaft trimmer and I am already in love with the longer shaft because I don't have to bend over to trim with it (my back says thank you). I used up a lot of string trimming around large rocks before I realized the trimmer has a variable speed trigger and slower speeds used less string. If all goes without complications tomorrow, I will probably change this review to 5 stars. I have ordered a leaf blower with battery and charger for only $10 more than the cost of a buying a spare battery without a charger. Seems like a no brainer choice if a person wants a spare battery for their trimmer. Once that leaf blower comes in I think I'll have more than enough run time to keep up with all my trimming needs. Update (5/18/2021) - After several outings with this trimmer, I will have to say the battery life of a single battery is more than adequate. Having reloaded string in the trimmer a few times, it proves to be super easy now that I have the hang of it. My only gripe would be the trimmer should have come with an included shoulder strap.
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Reviewed in the United States on May 14, 2021 by Mr Huskey
I bought this trimmer because of many good reviews online--both written and video versions comparing it to other cordless trimmers. The price on Amazon was the best available anywhere I could find. It shipped immediately from Amazon (which doesn't always happen as I am not a Prime member) and was received in just a few days. I assembled the unit (super easy) and took it out for some work shortly thereafter. This tool works very well. I don't care for the job of whacking weeds, but this unit did an excellent job and was easy to control (good trigger mechanism allows for very good speed control--you don't always need to blast at high speed). I also have a Stihl (gas) FS 56 trimmer which is noticeably heavier. That one is set up with a blade, not string like this one. It wears me out and I'm concerned about sparks from the blade when you nick a rock as we are in a high hazard zone for wildfires. I wanted something more easily controllable for my lightweight frame. This unit meets those needs. As much as I like Stihl products, this unit for the weeds is an easier tool to deal with. We don't have the density of vegetation (southern Rockies, forested hillside) that folks in the Midwest or East probably have, so you don't run this thing as continuously as you might in those environs. So my body wore out before the battery did. I'm not sure I'd want to be out working on weeds for as long as this battery will last. It also charges back up very quickly. Overall, a good sturdy unit that lives up to the hype. But ultimately, you're still having to whack weeds. And that's the only downside. Definitely recommended.
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Reviewed in the United States on June 13, 2022 by spiderlegs
Bought this weedwacker so I can help hubby keep up the property. A year later, I still love using it. I recommend getting a strap for it but it’s not too heavy and does a great job. Easy to use. Hubby now prefers mine over his gas one!
Reviewed in the United States on June 10, 2026 by dyan74
I love this trimmer. All I have to do is pop in the battery, hit the button, and I’m good to go — no gas, no pull cords, no mess. The start time is instant, which makes yard work a lot less frustrating. The power on this thing surprised me. It cuts through thick grass and weeds without bogging down, and the speed feels consistent the whole time. I’ve used gas trimmers before that would fade after a few minutes — not this one. It’s strong and smooth. The noise level is way lower than gas too. You still hear it, but it’s more of a hum than that loud buzzing that shakes your ears. The instructions were straightforward, and setup took less than ten minutes. The line feed handles thicker grass with no issue, and the 15-inch width makes it quick to clean up the yard. Pros: instant start, strong cutting power, quiet operation, and super easy to use. Cons: battery adds a little weight after a while, but nothing major. Overall, if you want something powerful but simple to handle, this is a great choice. I’ll take this over gas any day.
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Reviewed in the United States on November 10, 2025 by Cointreau
I'm a firm believer that if you can decide on a specific brand of battery operated equipment, try hard to buy just that brand so you may interchange batteries and chargers where permitted by manufacturer. With this said, I stick with 2 brands that I've had excellent luck with and cover different areas of use mostly, just a little overlap. The 2 brands (I have no deal with these brands, just like them because of my experience with them) I believe in are DeWalt and Ego. In this case my latest purchase was this weedtrimmer. It has great features and I am very impressed with the power it has and how long it operates on a charge. My favorite feature is filling up the spool with trimmer line. Ego has made this process one of if not the easiest to do in the industry! It holds a lot of line and being battery operated, is nice and quiet. I live right along side a field and every once and a while I need to cut it back some to not interfere with my cutting of the grass in my own yard. When doing this, every once in awhile you run across a small whip of a start of a tree. Obviously the line isn't going to cut through this but it also doesn't stop the Ego. It just hammers away til I backoff and cut around these saps. This Ego unit is on the line between homeowner and commercial quality. It's highend homeowner and takes the same battery and charger that I already have for other Ego products like the Leaf Blower for example. Even if I would get a Ego 2 Stage Snow Blower some day, they all take the same battery and charger. So if you have a large project going on, and a battery runs out... you have more charged batteries to grab and go on with. In my opinion, one of the greatest features of sticking with a brand. In my own opinion I believe you get excellent value for your money buying these 2 brands. Oh, and as far as durability, my leaf blower was the first Ego purchase I made years ago and I'm still using it and the battery and charger that came with it!
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Reviewed in the United States on April 29, 2025 by YooperNick
The EGO battery and charger emit fumes that sets off smoke detectors. I moved the product to two different locations, and it set of 3 different smoke detectors. I had to call the fire department which came out to check. They said the product is not safe. I called EGO and they were careful to say the product should not be used. They would not take it back or replace it. They were not interested in examining the defective product. They were "sorry about the inconvenience." It came from a third party Lightening95. Which, purchased in July 2025, sent a battery from 2020. I am very disappointed in this product, and the response from EGO. Would not recommend dealing with that company.
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Reviewed in the United States on July 21, 2026 by H. Grodman