Black & Decker 90508011 Lawn Mower Battery, 12-Volt. This is a 12-Volt battery for a lawn mower. Used on many Black & Decker and Craftsman models. 3-Inch long, 1-Inch wide, and 1-Inch high. Package weight of this item is 1-Pound. Black & Decker is a global marketer and manufacturer of quality products used in and around the home and for commercial applications. Black & Decker provides consumers with products that help make everyday living and working easier and more efficient.