CRAFTSMAN V20 20-volt Max 13-in Straight Battery String Trimmer with Edger Conversion Capable 2 Ah (Battery and Charger Included) in the String Trimmers department at Lowes.com
How to Change the oil in a 4 Cycle Grass Trimmer Weedeater - YouTube
Greenworks 40V 15" Straight Shaft String Trimmer with 2.5 Ah Battery and Charger, 2111802 - Walmart.com