Using the Milwaukee REDLITHIUM® USB 3.0AH Battery is easy. Just insert it into your Milwaukee® USB Rechargeable product. When it's time to charge, you can use a Milwaukee® USB Rechargeable product or the REDLITHIUM® USB Portable Power Source & Charger. It'll take about 2 hours to fully charge. As for maintenance, keep it in a cool and dry place. Avoid exposing it to extreme temperatures or moisture. Also, try to use up most of the battery's power before recharging it for a longer lifespan. And remember, this battery comes with a 2 - year warranty, so if you have any issues, reach out to the manufacturer.