Comparison Summary
For the broadest residential capability, the EGO POWER+ ST1623T combines a 16-inch swath, 0.095-inch line, brushless motor, adjustable carbon-fiber shaft, two-speed control, and a no-bump Line IQ feed system. The BLACK+DECKER BESTA510 is the more practical choice for a small yard beside an outdoor outlet because it runs continuously without charging, although its cord restricts movement. CRAFTSMAN’s CMCST901M1 is a balanced cordless kit for buyers who want a battery, charger, adjustable height, edging conversion, and a documented runtime claim tied to its included 4.0Ah battery. Other picks specialize in lighter handling, two-battery flexibility, power-versus-runtime control, wheeled edging, or adding a blower to the same battery system.
Buying Guide
Sizing and Capacity
Cutting swath is the amount of grass the head can cover per pass. The EGO ST1623T leads this group at 16 inches, followed by the EGO ST1502SA at 15 inches and the 14-inch corded BLACK+DECKER and CRAFTSMAN models. A wider swath can reduce passes across an open lawn, but it is not a standalone measure of cutting strength.
For routine grass and soft weeds, 12- to 14-inch models such as the WORX WG163, BLACK+DECKER LST300, BLACK+DECKER BESTE620, and Greenworks combo can be easier to control around beds and paths. Line diameter also matters: the EGO models specify 0.095-inch line, while the CRAFTSMAN and WORX kits specify 0.065-inch line. The heavier line supports positioning the EGO tools toward tougher residential growth, but no string trimmer here should be treated as a brush cutter for woody stems.
Feature Tradeoffs
Line-feed systems are not interchangeable. EGO’s Line IQ on the ST1623T is a sensor-based no-bump system, while its Powerload feature addresses winding replacement line. The ST1502SA uses Rapid Reload for loading line. Automatic Feed Spool on the BLACK+DECKER models supplies line as needed, while the CRAFTSMAN and WORX tools use push-button systems. These designs all reduce bumping or manual interruption, but they represent different mechanisms rather than a single performance category.
Edging features also differ. The BESTA510, LST136, LST300, CMEST913, BESTE620, and WORX WG163 convert for edging, while the WORX adds wheels, a 90-degree head tilt, and a spacer guard. Those controls are especially useful near sidewalks, ornaments, fences, and flower beds. For open trimming, a wider swath and thicker line may matter more than an edging guide.
Best For, Avoid If
| Profile |
Recommended Product |
Why It Fits |
Avoid If |
| Homeowners with larger lawns or heavier residential growth |
EGO POWER+ ST1623T |
Its 16-inch swath, 0.095-inch line, brushless motor, and included 4.0Ah battery give it the broadest documented trimming specification in the group. |
You need continuous operation beside an outlet or want the lightest, simplest tool for a very small yard. |
| Small-yard owners with convenient outdoor outlet access |
BLACK+DECKER BESTA510 |
The 120V corded design provides unlimited runtime, automatic line feed, a 14-inch path, and wheeled edging. |
Your property has distant beds, fences, or obstacles where extension-cord movement would be frustrating. |
| First-time cordless buyers who want a complete kit |
CRAFTSMAN V20 CMCST901M1 |
It includes a 4.0Ah V20 battery, charger, adjustable height, two speeds, and turn-to-edge operation. |
You regularly cut woody brush or need a wider path and thicker line than its 13-inch, 0.065-inch setup provides. |
| Users who prioritize light handling and backup battery flexibility |
WORX WG163 |
The 5.52-pound listed tool includes two batteries, support wheels, a spacer guard, head tilt, and push-button feed. |
You need a heavier-duty line specification or want the widest cutting swath available. |
| Cordless users who alternate between thick weeds and longer trimming sessions |
BLACK+DECKER LST136 |
The PowerCommand Dial lets you prioritize maximum power or maximum runtime, and the tool includes automatic feed and edging conversion. |
You want the smallest, lightest platform or already own batteries from another ecosystem. |
| Homeowners who need both a trimmer and a blower |
Greenworks 40V Trimmer and Blower Combo STBA40B210 |
The kit combines a 12-inch string trimmer, 390 CFM blower, 40V battery, and charger in one platform. |
You only need a trimmer and would prefer a lighter package or a higher-capacity battery for extended trimming. |
Key Specs to Compare
Start with the exact power source. The BESTA510, CMEST913, and BESTE620 are corded, so they can run continuously but require an outdoor-rated extension cord and keep the operator near an outlet. Cordless models improve mobility but introduce charging and runtime limits.
For battery tools, check the exact kit rather than assuming the title applies to every package. The CRAFTSMAN CMCST901M1 includes a 4.0Ah V20 battery and charger; the EGO ST1623T includes a 4.0Ah battery and charger; the EGO ST1502SA includes a 2.5Ah battery and charger; the WORX WG163 includes two 2.0Ah batteries and a charger; the BLACK+DECKER LST300 includes a 2.0Ah battery and charger; and the Greenworks set includes a 2.0Ah battery and charger. The LST136 listing includes a 40V battery and charger, but does not state the battery capacity in the available product facts.
Compare runtime only under its stated conditions. CRAFTSMAN’s up-to-63-minute claim is tied to low speed and its included 4.0Ah battery. EGO’s ST1623T claim is up to 60 minutes with its included 4.0Ah battery, while the ST1502SA claim is up to 45 minutes with its 2.5Ah battery. Vegetation, speed, line size, and cutting load can change actual use time.
Setup and Handling Considerations
Corded models need a suitable outdoor-rated extension cord, a nearby outlet, and attention to cord routing around the cutting head. Their advantage is continuous operation. Cordless kits need the included battery charged before work and should be matched to the correct platform: EGO 56V ARC Lithium, CRAFTSMAN V20, WORX PowerShare, BLACK+DECKER 20V or 40V, and Greenworks 40V are separate ecosystems.
Adjustability improves fit and control. The EGO ST1623T has a telescopic carbon-fiber shaft, while the LST136, LST300, BESTA510, BESTE620, CMEST913, and CRAFTSMAN CMCST901M1 list adjustable height or handle features. The WORX WG163 adds head tilt, wheels, and a spacer guard for edging. Check the tool’s listed weight and balance against the amount of time you expect to trim; a larger cutting path may save passes but can be less comfortable than a compact model.
Maintenance and Longevity
Electric trimmers avoid fuel mixing, spark-plug care, and gas-engine storage, but they still need ordinary line and battery management. Confirm that replacement line matches the model’s specified diameter and feed head. Automatic, sensor-based, and push-button systems may reduce bumping, but they do not remove the need to reload or replace line when the spool is empty.
Battery ownership is a long-term consideration. A buyer who already owns EGO, CRAFTSMAN V20, WORX PowerShare, BLACK+DECKER, or Greenworks tools may value a compatible bare tool later, while a first-time buyer should confirm that the exact kit includes the battery and charger. Store batteries and chargers according to the manufacturer’s instructions and keep the cutting head clear of accumulated grass. Warranty coverage also varies: the EGO ST1623T listing includes five years for the tool and three years for the battery, while the EGO ST1502SA, CRAFTSMAN CMCST901M1, and several BLACK+DECKER models list their own limited warranty terms.
Reliability Signals
Useful reliability signals are a clearly identified model number, a consistent kit description, a documented battery platform, a stated line-feed design, and warranty information that matches the exact product. The EGO ST1623T, CRAFTSMAN CMCST901M1, and BLACK+DECKER BESTA510 have especially clear model-specific documentation for their main differentiators.
Treat marketing language carefully. A listed brushless motor, transmission, RPM, voltage, or cutting swath describes the product, but does not independently establish performance in every type of vegetation. Runtime is an “up to” figure, and battery claims should remain tied to the stated battery and speed. For the Greenworks combo, assess the trimmer and blower separately: its two-tool value is meaningful, but the 16.53-pound listed package weight and 2.0Ah battery affect how attractive it is for long trimming sessions.
How to Compare Reviews
Read reviews for the exact model and kit identifier, not just the brand family. Look for comments that identify the battery size, speed setting, vegetation type, cutting width, and whether the user was trimming open lawn, edging borders, or clearing heavier growth. A complaint about runtime on high speed should not be compared directly with a low-speed runtime claim, and a cord complaint may be irrelevant to a buyer who already has a convenient outlet.
For line management, look for model-specific reports about loading, advancing, and replacing line rather than treating “auto-feed” as a guarantee of identical behavior across products. For edging, prioritize comments about the actual wheel, guide, head angle, or conversion mechanism. Reviews are most useful when they reveal a fit issue or a use-case limitation that matches the product’s documented design.
Common Mistakes
Do not choose by voltage, amperage, RPM, or cutting width alone. A 14-inch corded model may be the better choice for a small yard beside an outlet, while a cordless 12-inch model may be more practical around obstacles. Likewise, a wider swath does not make a string trimmer suitable for woody brush.
Do not assume every listing includes a battery, charger, guard, wheel, or spare spool. Verify the exact ASIN and kit contents, especially when a brand sells both tool-only and complete-kit versions. Do not compare runtime claims without checking battery capacity and speed conditions. Finally, do not overlook the battery platform: a cordless trimmer can be a better purchase when it uses batteries you already own, but a poor fit if it creates a new charging ecosystem for a single tool.
Frequently Asked Questions
Should I buy a corded or cordless electric weed wacker?
Choose corded for a small yard near an outlet and uninterrupted work. Choose cordless when you need to move around fences, beds, walkways, or distant areas without managing an extension cord. Cordless models require charging and are limited by battery runtime.
Which model has the longest documented single-charge claim?
The CRAFTSMAN CMCST901M1 claims up to 63 minutes with its included 4.0Ah battery at low speed. The EGO ST1623T claims up to 60 minutes with its included 4.0Ah battery. Those conditions are not identical, so the figures should not be treated as a direct performance test.
Which line-feed system is easiest to compare?
The EGO ST1623T is the clearest no-bump option because its Line IQ system is described as sensing and feeding line automatically. Other products use automatic spools, push-button feed, or rapid reload systems. Check the exact mechanism rather than assuming all no-bump designs work the same way.
How much cutting width and line thickness do I need?
A 12- to 14-inch path is generally practical for routine residential grass, soft weeds, and edging. The EGO models specify 0.095-inch line and are positioned toward tougher residential growth, while 0.065-inch models are better matched to lighter trimming. No listed string trimmer should replace a brush cutter for woody brush.
Final Recommendation
The EGO POWER+ ST1623T is the strongest overall recommendation because it combines the widest 16-inch swath in this group with 0.095-inch line, a brushless motor, adjustable carbon-fiber shaft, two-speed control, Line IQ no-bump feeding, Powerload winding, and an included 4.0Ah battery and charger. Choose the BLACK+DECKER BESTA510 instead when your priority is continuous, no-charge operation in a small yard near an outlet. Choose the CRAFTSMAN CMCST901M1 when you want a more compact, ready-to-use cordless kit with an included 4.0Ah battery, adjustable height, and turn-to-edge operation.
