Using this CR1220 3Volt lithium battery is easy. First, make sure your device is turned off. Then, locate the battery compartment on your circuit board. Place the battery horizontally and use the soldering tags to secure it in place. When handling the battery, avoid dropping it or exposing it to extreme temperatures. Keep it in a dry and cool place. If you're not using the battery for a long time, remove it from the device. Periodically check the soldering points to ensure they're secure and there are no signs of damage. This way, you can make the most of your battery and keep your device running smoothly.