Ridgid Genuine OEM AC840085 1.5 Amp Hour 18V Compact Lithium Ion Power Tool Battery with Onboard Fuel Gauge and Flat Standing Base FADE-FREE POWER: With this lithium ion battery, your power tools will run as though they were fully charged until this battery runs out EXTREME COLD WEATHER PERFORMANCE: This battery can function properly in temperatures as low as -4 degrees Fahrenheit (-20 degrees Celsius) FUEL GAUGE: A 4 level LED panel will tell you how full the battery is in increments of 25%, giving you the information you need to recharge in a timely fashion FLAT STANDING BASE: With this convenient design, you can keep your tools standing in an upright position. This is great for handheld work lights, where they can stand on the ground and let you work with both hands COMPACT SIZE: These batteries are one of the smaller models. By being smaller and lighter, youll have an easier time working on longer jobs