Using your CNHL 4000mAh 14.8V 4S 30C Lipo Battery is easy. First, make sure to connect it properly using the XT90 output connector and JST/XH balance connector. When charging, don't exceed the 5C max charge rate to keep the battery in good shape. During use, avoid over - discharging it, as it can damage the battery. As for maintenance, store the battery in a cool and dry place. Check the battery regularly for any signs of damage or swelling. If you notice anything unusual, stop using it right away. This way, your battery will serve you well for a long time.