Gas motors can be very heavy; for example, Ryobi says its $269 4-Stroke 30cc Gas Trimmer weighs 12.25 pounds while the 40V Brushless 16-inch Cordless String Trimmer weighs 8.4 pounds. While it's ...

Gas is powerful and cordless, but it's loud, produces fumes, vibrates more, and often requires more maintenance. Most of Ryobi's trimmers are powered by the company's 18V and 40V One+ battery systems.