Using your DeWalt DCBP520C is easy. First, insert the 5ah Powerstack Battery into your DEWALT 20 - Volt MAX tool. You'll notice the 3 - LED fuel gauge system that gives you a quick idea of the battery's charge level. When it's time to charge, just connect the battery to the included charger. Remember, this battery has no memory effect, so you can charge it whenever you want without worrying about reducing its lifespan. Keep it in a cool, dry place to maintain its performance. Also, make sure to check the 90 - day money - back guarantee and 3 - year free service contract from DEWALT for any issues that might arise.