Which string trimmer offers the best battery life?

The EGO ST1511T is a 15 in battery-powered string trimmer with POWERLOAD automatic line winding, a brushless motor, and a telescopic shaft; it includes a 56 V 2.5 Ah battery and charger and delivers up to about 45 minutes run time on the included battery. It uses professional-grade 0.095 in dual spiral-twist line and offers variable speed and weather-resistant construction, suitable for homeowners wanting near-gas power without cords.

Brushless 18 V cordless string trimmer with a 36 cm cutting width, foldable design, two-speed control, and Quick Load 2.0 mm spool for fast line replacement. Lightweight and compact with an adjustable second handle, suited for homeowners and pros needing portability and solid cutting performance without cord or petrol.

Brushless 60V cordless string trimmer with a carbon-fiber straight shaft, dual-feed bump head, and a 17 in cutting path; includes a 4.0 Ah battery and charger and offers variable speed and two-speed control. Lightweight construction and a long runtime make it suitable for homeowners who want gas-equivalent power without fumes or maintenance.

A 40V battery-powered, brushless Expand-It string trimmer with an adjustable 15 to 17 in cut swath, REEL EASY+ 3-in-1 head that accepts heavy .105 in line, carbon fiber shaft for reduced weight, and variable speed with 2-speed switch. Sold as a kit with a 40V 6.0 Ah or 4.0 Ah battery depending on the listing, it suits users who want gas-level power with quieter operation and attachment capability.

Brushless 60V battery trimmer with a carbon-fiber telescoping shaft, twist-to-load bump head, variable speed and up to 45 minutes runtime from the included 2.5 Ah battery. It's lightweight, collapsible for storage, and includes charger and battery, targeting residential users who want cordless convenience and professional features.