If you’re a handyman looking to step up your game to something a little more powerful, then take a gander at the Ridgid AC840087P lithium ion battery pack. It has up to four times the amount of power found in standard lithium ion batteries. With a range of features, it packs more than just power. This battery has an onboard fuel gauge that helps you anticipate what kind of charging will need to be done onsite. It’s also designed with weather-resistance in mind. It can function in temperatures as low as -4 degrees Fahrenheit and as high as 120 degrees fahrenheit. Built into these batteries are electrical components that will protect from surges and user overloads. Whether you’re running a power tool or an 18 Volt stereo system, these 4 amp hour batteries are the way to go.