Price: The price of a cordless string trimmer usually varies. People say that the more expensive the string trimmers, the better their result. Battery-powered trimmers are more expensive than gas-powered trimmers, but gas-powered trimmers with large engines can also be costly. You should also take note of the phrase "bare tool." It means a cheap string trimmer with no battery or charger, so you have to buy them separately. Buying parts separate from the trimmer will increase the overall cost.

Maintenance: Battery-powered trimmers require low maintenance. Gas-powered trimmers need a lot of upkeep for the engines.

Adjustability: When buying cordless string trimmers, look for one with an adjustable handle, shaft length, and cutting head angle because they enable comfort.

Weight: Heavy cordless string trimmers can make use very challenging. String trimmers of more than 10 pounds are not suitable for people with limited upper body strength and senior citizens. Some string trimmers have space for attaching shoulder straps, which can help lighten the load of the trimmer when using them.

Power: This is dependent on the power source. For gas-powered string trimmers, power is measured using the size of the engine in cubic centimeters (cc). For battery-powered, it is determined using the battery voltage. The larger the engine or battery voltage, the more power produced by the string trimmer. Based on the design, gas trimmers are more powerful than battery-powered trimmers.

Cutting Swath: It is an area a string trimmer can trim at once. The cutting swath is a function of the width of the string trimmer's head. A larger cutting swath will cover more grounds in less time, while a smaller cutting swath is beneficial for maneuvering tight spots. Gas-powered trimmers usually have a larger cutting swath than battery-powered trimmers.

Trimmer Shaft: There are two types of string trimmer shaft. Straight shafts are more common and offer longer reach. Some of them have a telescoping feature that allows you to make the shaft short or long to perform the task. Straight shaft trimmers are better for tall users as they create great distance between you and the debris flung. They can reach beneath bushes and shrubs. Curved shafts are less common, and they are suitable for hard-to-reach small corners. They are for open area trimming as they are lighter and easier to handle.

Line Diameter: this determines the thickness of string a trimmer can hold. Powerful string trimmers use thicker strings because they are durable and can trim thicker weeds. For residential needs, a line diameter of 0.065 to 0.08-inch is suitable. For heavy-duty work, a line diameter of 0.095-inch or more is best.

String Feed System and Reloading: There are two systems for feeding strings to a trimmer. The bump-feed works by tapping the head on the ground, which lets out more string. The automatic feed spool replaces strings once it breaks off. Whichever you go for is based on your preference. Buy a trimmer with a spool that is easy to replace or to load with a new string.

Ryobi RY253SS String Trimmer is one of the best string trimmers for large yards. It allows you to cover more grounds faster with a cutting swath of 18-inches. It has a durable crank engine with a power of 25cc.

WORX WG191 String Trimmer delivers a performance similar to any good gas trimmer, with a powerful battery of 56 volts. It is easy to use with a weight of 6.3 pounds and a cutting swath of 13 inches.

BLACK + DECKER LST140C String Trimmer is a relatively cheap battery-powered trimmer with a 40-volt battery. It is easy to use, weighs 6.4 pounds, and has a cutting swath of 13-inches and an automatic feed spool.