EGO Power+ ST1521S 15-Inch String Trimmer with POWERLOAD and Carbon Fiber Split Shaft Weed Wacker 2.5Ah Battery and Charger I

4.5 4.5 out of 5 stars | 5,288 ratings

Price: 249

Last update: 01-06-2025


About this item

POWERLOAD Head, load your line, push a button and go
15” cutting swath
Dual-feed spiral twist 0.095in. Line
High-efficiency brushless motor
Variable speed control
Power source type: Battery Powered

Product information


Top reviews from the United States

  • Maintenance Engineer
    5.0 out of 5 stars This Machine is a BEAST
    Reviewed in the United States on September 23, 2024
    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.
  • James E. Bullock
    5.0 out of 5 stars Highly adjustable, high productivity trimmer with great battery capacity
    Reviewed in the United States on September 24, 2023
    To set the stage, I'm 87 years old with hands pretty well crippled by rheumatoid arthritis. A few years ago I volunteered to do trimming for a non-profit Nature Education Center, an old farm with extensive lawns, driveways, fence lines and structures. Lots of lawn grass, high grass, weeds including thistles, briars, etc.. Due to terrain, exposed rocks and tree roots, etc., there are extensive stretches the riding mower can't access so I actually do a fair amount of lawn mowing with the trimmer. I first used an EGO 1500 series trimmer with two 2.5 AH batteries and an accessory EGO shoulder strap. In two-plus seasons, I trimmed for a couple of hours almost every day that weather permitted so the trimmer received heavy use. It refused to run in early September, 2023. The new EGO 1623T offered some attractive features so I purchased it rather than have the 1500 repaired. Assembly posed minor problems. In a couple of spots machine screws have to pass through a drilled hole in one part and thread into a hole in a mating part. Alignments were not perfect and required a fair amount of strength to correct. However, given the machine that emerged, this is certainly no deal breaker. I was concerned that the new 4.0 AH battery might make the unit unpleasantly heavy. Not to worry. The increased weight is barely noticeable and the unit's balance is quite good. The increased battery capacity saves a lot of travel time getting spares. What amazed me most of all about the trimmer is how long the supplied spool of trimmer string lasted. I started using the trimmer on Sept. 6th. The last of the supplied string kicked out on Sept. 21st. The automatic line feed feature worked perfectly the entire time. The combination of the high-capacity battery, not having to bump-feed, not losing string to accidental bump-feeds and the durability of the EGO string allows long periods of uninterrupted work. I had previously used non-EGO string on large spools but have switched to EGO string for its durability. Needless to say, the EGO string loading process remains as painless as ever. Just take a 14 ft. length of string, pass one end into a hub eyelet, through the hub and out the other eyelet, even up the ends and push the close-by green button. The motor clicks away and the string in spooled inside. The 56 volt batteries are easy to grip and handle and they install and remove easily. I found early on with the prior 1500 series model that I needed a shoulder strap to take some of the weight and bought the AP1500 EGO strap. My experience with that strap has been disappointing with respect to longevity. At the machine end the nylon strap threads through a rectangular ring and is stitched back to itself to complete the attachment. The ring has an attached hook that clips onto a fitting on the trimmer tube. The problem is that the stitching used to close the loop around the ring is inadequate and fails prematurely. I have 3 otherwise-usable EGO straps that are useless because that stitching failed. I tried a generic strap but found the shoulder pad is much shorter than EGO's. That makes it much fussier to position on the strap such that it locates properly on the shoulder. By the way, I've seen reviews of the strap complaining that the shoulder pad doesn't attach to the strap and, instead, slides along it. In fact, the pad has to slide along the strap as the strap is adjustable in length. How it's adjusted determines where the pad should be located. One has only to pull the strap taut, slide the pad so it's centered at the top of the loop, lift the machine with a hand under the pad, pass the strap over the head and drop it on the shoulder. Other than the mentioned failure mode, the strap is well made and has an excellent shoulder pad. My fingers are misaligned due to the arthritis. With the 1500 trimmer I found it difficult to keep my index finger from slipping off the trigger. I improved the situation by wrapping rubber bands around the slippery plastic trigger to improve the grip. On that machine the trigger lock is a thumb-operated button. On the 1623 the trigger lock is a small lever at the forward end of the trigger. It is easily operated by the side of the finger being used to control the trigger. I find no tendency for my finger to slip off the trigger. The adjustments for tube length and the handle position are secure and operate smoothly. I routinely operate the unit in the lower speed range. My sense is that it's roughly equivalent in effectiveness to the 1500 at that setting. I switched it to the high setting to get a sense of what that offered and concluded that the speed wasn't needed and was therefore draining the battery unnecessarily. Bottom line: I'm glad my 1500 failed as the 1623 offers so much more convenience and productivity, albeit at a price premium.

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