EGO Power+ ST1623T 16-Inch Line IQ 56V

Cutting Power and Real-World Use

The ST1623T runs a brushless 56V motor that Pro Tool Reviews described as having no trouble slicing through dense weeds at high speed. TechGearLab tested it against St. Augustine runners, privet seedlings, and overgrown ditches and reported the head never bogged, scoring it 84/100 across their full battery shootout. The dual-speed selector matters here: low mode is fine for maintenance trimming, but kicking it to high mode gives noticeably more line speed for thicker material.

What stands out is how consistently it cuts at the full 16-inch swath. Bump-feed trimmers shorten as the line wears, forcing you to slow down and tap the head. Line IQ keeps the cutting circle at full width automatically, so you can walk a steady pace along a fence line instead of stopping every 30 seconds. Reviewers consistently call this the feature that justifies the price.

Battery Life and Runtime

EGO claims up to 60 minutes of cut time on the included 4.0Ah pack, and Pro Tool Reviews actually measured 1 hour and 4 minutes at high speed. TechGearLab's test conditions were tougher and they logged closer to 50 minutes before the battery tapped out, which they noted fell short of the best-in-class extended runtime. Either way it's enough to finish edging on most suburban lots without a swap, and the same 56V pack drops into EGO mowers, blowers, and chainsaws.

The downside is recharge time. With the standard 320W charger it takes roughly 70 minutes to top up the 4.0Ah, which is slower than some competitors. If you have a larger property and need to keep cutting, EGO sells a faster rapid charger and a 5.0Ah pack that buys back the lost time but pushes the kit price further north. EGO's 56V batteries have active thermal management — they include a fan and temperature sensors — which protects long-term capacity and is uncommon in this category.

Line Feed and Refilling

Line IQ is the headline feature: an internal sensor monitors the cutting circle and feeds line automatically so you never bump the head. Pro Tool Reviews flagged the one wrinkle, which is that hitting a chain-link fence or hard brick edge will break line faster than the system feeds, leaving you briefly under-length until it catches up. For typical lawn trimming the system is essentially transparent.

When you do need to reload, POWERLOAD takes the pain out of respooling. TechGearLab measured under 30 seconds from cracking the head open to fresh line installed: you thread the pre-cut piece through, hold the button, and the head winds itself. Trimmers without this feature force you to hand-spool 20 feet of stiff line by hand, and that delta alone justifies the EGO for many buyers.

Weight and Ergonomics

At 12.6 lb with the 4.0Ah battery clipped on, the ST1623T sits on the heavier end of cordless trimmers — close to the weight of the Husqvarna 525L gas pick. The carbon-fiber telescopic shaft helps the balance feel less front-heavy than the scale suggests, and TechGearLab still called it well-balanced for extended sessions. Anyone who wants noticeably lighter should drop to a smaller battery, which trades runtime for relief.

There's no shoulder strap in the box despite an attachment point on the shaft, which TechGearLab specifically flagged as a miss at this price. Buyers planning long sessions on hilly or large lots should plan to add one. The auxiliary D-handle is height-adjustable along the shaft and the rear grip has a soft overmold that doesn't cause hot spots even after an hour.

Telescopic adjustment is toolless via a twist-collar — extend the shaft for tall users or compact it for storage. Reviewers consistently note this is more useful in practice than the marketing implies, since the trimmer fits in standard sedan trunks fully collapsed.

Build Quality and Materials

EGO backs the tool with a five-year warranty, the battery with three years, and the carbon-fiber shaft with a lifetime warranty. That's the most generous coverage in the consumer cordless category and reflects real confidence in the build. The brushless motor has no contact wear surfaces and the gearbox is fully sealed against grass clippings and the dust that wears out brushed-motor trimmers within a couple of seasons.

The plastic housings around the motor and head are heavy-duty polymer rather than the thin shells you find on $99 cordless trimmers, and the head guard is reinforced. Multiple long-term owner reviews report no functional failures after a full season of use, with the auto-feed mechanism continuing to track correctly through dozens of spool reloads. The trigger assembly uses a metal pivot rather than the molded plastic catches that fail first on budget cordless trimmers.

Where It Falls Short

Three things keep this from being a default recommendation. The kit price hovers near $329, roughly double the Ryobi 40V mid-tier pick. The 12.6 lb working weight is a real consideration for users with shoulder or wrist issues. And the auto-feed system, while normally transparent, can run line short when trimming hard fence lines faster than the sensor can react.

Recharge time on the standard charger is also slow enough that anyone with more than an hour of trimming will want a second battery or the rapid charger upgrade. Finally, the POWERLOAD head works best with EGO's round-profile pre-cut line; aftermarket square-profile line doesn't load through the system cleanly, limiting your reload options.

Who It's Best For

Suburban homeowners with a quarter to one acre who want gas-grade cutting performance without the noise, fumes, fuel mixing, or pull starts. If you already own EGO mowers or blowers, the shared 56V battery system makes this an obvious add. If you trim weekly and value not thinking about line feed or spool reloads, the time saved compounds.

Skip it if you primarily edge along chain-link or have a small flat lot under 5,000 sq ft. The Worx WG170 at one-third the weight and one-third the price will satisfy that use case. Skip it also if you're a professional running daily commercial work: the Husqvarna 525L's gas powerband and faster refuel still wins for crews on hourly billing.

How It Compares to Alternatives

Pro Tool Reviews' battery shootout ranked the ST1623T at 86 points and called it the easiest, most convenient cordless trimmer to use. The Ryobi RY402110 scored slightly higher (90 points) on raw cutting power thanks to its 0.105-inch line option, but Ryobi requires manual bump-feed and lacks POWERLOAD reload. The Husqvarna 525iLST 36V scored 93 points but costs nearly $700 with battery and targets crews, not homeowners.

Against the gas-powered Husqvarna 525L in this category, the EGO loses on instant-start under heavy load and on multi-tank work sessions, but wins decisively on noise, neighborhood courtesy, vibration, and zero maintenance. For most homeowners who don't already own a fuel can, the EGO is the smarter pick.

Long-Term Durability

The five-year tool warranty is the longest in the consumer cordless trimmer category, and EGO's track record on the 56V platform — the first widely-shipped 56V residential outdoor line — has been good enough that the brand is now used as the comparison baseline by competitors. Long-term owners on the Garage Journal and various Reddit threads report multi-season use with no mechanical failures of the motor, gearbox, or trigger assembly.

The Line IQ sensor and POWERLOAD mechanism are the parts most likely to cause long-term concerns since they're the newest engineering on the platform. So far field reports are clean. Pre-cut line for the POWERLOAD system is widely available from EGO and aftermarket sources, so spool consumables aren't a lock-in concern. Battery longevity follows standard lithium aging — figure 500-800 deep cycles before noticeable capacity loss, which for typical homeowner use is 5-8 years.