Using the CR2354 3 - Volt Lithium Battery is simple. First, check the polarity of the battery and make sure it matches the device's requirements. Then, use the solder tags to mount it vertically on the circuit board. When handling the battery, avoid dropping it or exposing it to extreme temperatures. Keep it away from water and flammable materials. For maintenance, store the battery in a cool, dry place. If the battery doesn't seem to work well, check the connections on the circuit board. If it's completely discharged, replace it with a new one.