Greenworks

There is another Brand which offer Batter Power and it is the DR Pulse 62V. There are two Battery Power models available
Click link to see details Description & Specification of the DR Pulse 62V.
Regardless of brands, models, Gas or Battery Power. All the walk behind trimmer have an issue.
The trimmer is heavy, and bulky. Engine or motor vibration, rough and uneven ground, potholes...Very hard to control, maneuver.
So it is hard to trim for a long period of time.
The reasons for this poor designed is. You have to push down on the trimmer's handlebar, to raise the trimmer mow-ball above the ground,
During the entire time while trimmer.
Otherwise, the trimmer will not move.
There is another issue. The cutting heights adjustment feature (which let you set how high to trim is not in effect and to my is fall-claimed).
Let me explain. As you push down the trimmer's handlebar,
The trimmer's lines ( 2 or 4 lines depend on the trimmer brand, model)
For every revolution, the line hit the ground 2 or 4 times.
At the back of the trimmer body-frame-deck.
How long do you think those line need to be? Well not long at all.

We have great news for you.
We invented the 3rd wheel conversion kit, we called it the WBTAP abbreviate of 'Walk Behind Trimmer Attachment Plate'.
It transform the trimmer into a three wheeler.
There is no welding, cutting or drilling is required on the trimmer.
Just need two 7/16" wrenches to install.
After installed the WBTAP.
You can move the trimmer by one hand, turn 360 degrees with ease.
Eliminate the need of push down on the trimmer's handlebar.
The adjustable  cut heights setting can be in effect, let you have even highest which not working without the WBTAP.
Work Smarter, Not Harder.

Model - Greenwork Pro 60V  WT60L00 & WT60L800
Cutting Wide:  22"
Motor Wattage:  480W
Speed:  3200 RPM
Cutting Height:  1.5" - 3"
Wheel Size:  14"
Dimension:  37" x 54.2" x 20.8"
Frame:  10 Gauges Steel
Weight:  49 lbs.
Torque:  6.25 lbs.
Maximum Run Time:  40 minutes
Charging time:  90 minutes
Battery & charger: 60V 8.0 Ah lithium-ion battery
6A Dual-Port Charger charger CH60DP01 and other CAC series
Starting:  Electric start button
Trim Ball : 4"
Type: Push Model
Line: 3 mm - 1/8"
Warranty:  4 years