Using your Milwaukee REDLITHIUM® USB 3.0AH Battery is easy. Just insert it into any Milwaukee® USB Rechargeable product. You'll notice it provides longer runtime and more power right away. When it's time to charge, use a Milwaukee® USB Rechargeable product or the REDLITHIUM® USB Portable Power Source & Charger for the fastest charge. It'll take about 2 hours. As for maintenance, keep the battery in a cool, dry place. Don't expose it to extreme temperatures or moisture. And remember, this battery has a 2 - year warranty, so you're covered if anything goes wrong.