Using your DeWalt 20V Max PowerStack 5Ah batteries is easy. Simply insert the battery into your compatible DEWALT 20-Volt MAX tool and start working. The 3-LED fuel gauge will give you an immediate idea of the battery's charge status. When it's time to recharge, use a suitable DEWALT charger. For safety, avoid exposing the batteries to extreme temperatures or moisture. Store them in a cool, dry place. To maintain their performance, fully charge and discharge the batteries regularly. With proper care, these lightweight and high-capacity batteries will serve you well for a long time.