Cordless electric string trimmers are a terrific low-cost choice for smaller trimming jobs.
Because they're battery-powered and cordless, your range of motion isn't restricted by an extension cord.
Cordless string trimmers are great for cutting errant grass and weeds, but they lack the power to mow down hardy weeds and brush.
New battery technology has made these weed wackers more popular than ever.
Rechargeable batteries for lawn tools typically run for 45-60 minutes. If you'll be doing large projects, consider a backup battery so you won't have to wait for the battery to recharge.
Ni-Cad battery-powered string trimmers
are generally the least expensive cordless models. Ni-Cad batteries are relatively heavy, and you will see a noticeable drop-off in power and performance as the battery runs down to the end of its charge.
Lithium ion batteries are the most recent innovation to power string trimmers. Lithium-ion batteries are available in several different voltages - 18-volts
Lithium-Ion batteries are extremely popular for 3 main reasons:
They are light weight – up to 50% lighter than a comparable Ni-Cad battery – so the string trimmer won’t weigh as much when in use
They do not experience any drop-off in power or performance as the battery runs down. Power output stays consistent through the entire cycle of use
They can be recharged up to 3 times as many times as a Ni-Cad battery before the battery needs to be replaced
string trimmers are good for grass and weed trimming in open areas. Because of the curved shaft design, you will not have as much maneuverability trimming in tight spaces, such as under a fence.
They are considered easier to use than straight-shaft trimmers.
string trimmers are more functional in tight spaces. You can trim in hard-to-reach corners or areas farther away from yourself.
Many models feature a telescoping shaft, meaning you can make the shaft as short or long as you need to comfortably trim.
Some cordless string trimmer models are a 2-In-1 style, meaning you can use them for multiple-purposes.
Use it as a string trimmer, or turn the pivoting cutting head to use as a grass edger.
The video above describes how to use a 2-In-1 string trimmer.