FADE-FREE POWER: Until the energy runs out, this battery will run as though it were fully charged. That way, you can work consistently throughout your job without worrying about your tools losing their efficacy REDLINK COMMUNICATION SYSTEM: This battery communicates with computer chips in M12 tools and M12 chargers, receiving information from both systems to optimize power output and charging levels VERSATILITY: This battery will run with over 70 tools in Milwaukee’s M12 line. Use it with tools like compact drill / drivers, impact drivers, area lights, and even heated jackets COMPACT SIZE: Compared to the M18 line of batteries, these are lightweight and portable, giving you improved handling over your tools