Get great value with the STIHL FSA 57 Lithium-Ion trimmer. A lightweight, battery-powered trimmer, is an ideal choice for maintaining suburban yards. This trimmer cuts an 11" swath at a continuous high speed, saving time and doing more with a STIHL AK Series battery. With an AK 10 battery, the trimmer weighs just 7.5 pounds and has a run time of up to 20 minutes on a single charge.