EXTREME WEATHER PERFORMANCE: These batteries can function in temperatures as low as 0 degrees Fahrenheit (-18 degrees Celsius), letting you use your tools year-round ONBOARD FUEL GAUGE: You can see how much fuel the batteries have charged up with the LED panel on their sides, keeping you aware of when you need to recharge FADE-FREE POWER: These will power your tools up to full strength, even when the battery’s charge is low REDLINK INTELLIGENCE: These batteries will communicate with the M18 tools they’re plugged into, keeping them from overheating, resulting in a more efficient workflow VERSATILITY: Over 40 tools in Milwaukee’s M18 line can be powered with these batteries, giving you power from the jobsite to the campsite