Product details:

The 4.0 Ah ARC Lithium Battery is equipped with an upgraded fuel gauge. you can now see how much battery power you have left in 20% increments. The ARC Lithium battery technology is the industry's most advanced; equipped with patented Keep Cool Cell Technology; which keeps the cells cool and prolongs the life of the battery.
Features:ARC Lithium design keeps battery from overheating so equipment runs longer at full power
Brand:EGO
Manufacturer:Chervon
Assembled Product Dimensions (L x W x H):10.63 x 10.24 x 3.94 Inches