Corded vs Cordless Trimmer: What Is the Difference?

The core difference: where the power comes from

Both types spin a nylon line to cut grass and weeds. The difference is the energy source. A corded trimmer draws electricity from an outlet through an extension cord. A cordless trimmer carries a lithium-ion battery pack on the tool and runs from that.

That one change affects almost everything else: how far you can go, how long you can work, how much the tool weighs, and what you have to manage while you cut. One means managing a cord, the other means managing a charge.

What a cordless line trimmer is

A cordless line trimmer, or battery string trimmer, is a trimmer with a motor, a spinning line head and a removable battery. There is no gas, no oil and no pull cord. You press the trigger and it runs.

Battery size is the key spec. Voltage tells you the system rating, and energy in watt-hours (Wh) tells you how much charge the pack holds. On our best cordless string trimmer page, the EGO ST1502SA is a 56 V model with 140 Wh and lists up to 45 minutes of runtime. The goodjob 20V model lists 40 Wh. A bigger Wh number generally means more cutting time between charges.

Corded vs cordless side by side

Here is how the two types compare in everyday use. These are general traits, not specs for one model.

Cordless trimmers vary a lot, so check each model's listed numbers before you decide.

Battery vs gas

Many people ask how a battery string trimmer compares with a gas one. Gas trimmers burn a fuel and oil mix. They run until the tank is empty and refuel in a minute, but they are louder, give off exhaust and need more upkeep, such as fuel handling and spark plugs.

Battery trimmers have no fuel and no exhaust, and they start with a trigger. The goodjob listing, for example, describes no gas, no oil and noise below 75 dB. That is the maker's claim, not our measurement. The tradeoff is runtime. When the pack runs down, you stop and recharge or swap to a second pack.

A corded trimmer sits between the two. It has the simple, low-maintenance design of an electric tool, with no battery to charge, but you stay tied to an outlet.

What to check on a cordless model

If you lean cordless, a few specs matter most. Our comparison page notes that many makers skip some of them, so it helps to know which ones to look for.

Here is a short checklist:

• Battery energy (Wh): Use this to compare pack size. Only three of the 15 products on our page list a runtime, so Wh is often the best guide.
• Weight: Listed weights on our page run from 3.28 lb to 7.8 lb. The 3.28 lb ALSO GO is the lightest listed, while the 7.4 lb EGO carries a larger battery.
• Cutting swath: This is the width of the cut circle. The EGO lists 15 in, while most others that list it show 12 in or 13 in. Wider means fewer passes.
• Line feed: Auto feed advances line for you. Bump feed needs a tap on the ground.
• Extra batteries: Some kits include two packs. The HortiHub and goodjob each list two 2.0Ah batteries.
• What is in the box: Check that the battery and charger are included. The SHOHO model on our page leaves them out.

Which one should you pick?

Choose corded if your lawn is small, an outlet is close and you want to avoid charging. You never run out of power mid-job, but you have to keep the cord behind you and away from the cutting line.

Choose cordless if you want to reach a fence line, a front yard or a back corner without hauling a cord. Match battery size to your yard. A short job suits a small pack. A long edging session calls for a larger pack or a spare battery.

Always read listed runtimes with care. The HortiHub listing says about 15 to 20 minutes per charge, while the EGO lists up to 45 minutes. Maker figures depend on conditions, so treat them as a rough guide. For a full spec-based ranking, see our cordless string trimmer comparison.

Safety notes for any trimmer

Trimmers throw stones, grit and cut debris. Wear safety glasses or goggles every time, plus sturdy shoes, long pants and gloves. Hearing protection is smart with louder tools, especially gas models.

With a corded trimmer, use an outdoor-rated extension cord, keep the plug connection off wet ground and never cut near the cord. Stop and unplug the tool before clearing a jam or changing line.

With a cordless trimmer, remove the battery before changing line or clearing the head. Keep batteries out of rain and extreme heat, and use only the charger made for that pack. Keep children and pets well away while you work.

Frequently asked questions

Is a cordless trimmer as strong as a corded one?

It depends on the model. Power comes from the motor and battery system, not just the power source. Check voltage, Wh and line diameter, then compare them to the job. Thicker line, such as the EGO's 0.095 in, suits tougher weeds than 0.065 in line.

Do I need a second battery?

If your yard takes longer than one charge, yes, a spare helps. Some kits include two packs. Check whether the one you are considering does, since not every model ships with a battery.

Can a cordless trimmer also edge?

Many can. A number of models on our comparison page convert to an edger, and some have a pivoting head for slopes and tight corners.

Do cordless trimmers need much maintenance?

Less than gas models. There is no fuel or oil to manage. You mainly replace line, clean grass from the head and store the battery properly.