Use this either as a spare, a replacement, or as your first battery in your outdoor tool lineup. It can charge 40V outdoor product line. That includes their leaf blower, chain saw, edger, hedge trimmer, lawn mower, string trimmer, power head, pole saw, and hedge trimmer. You're bound to be using at least one of these tools at any point during the year, and that means you'll need reliable energy. This 40 Volt battery has the features any homeowner needs in a reliable product. It has an onboard fuel gauge, letting you know how much of a charge is left with LED lighting. Its power doesn't fade over time, meaning that you can work with your tools on full power until the battery runs out. Perhaps most impressive is this battery's cold-weather performance. It can work in conditions as cold as -4 degrees Fahrenheit!