Using this CR2450 - NFH battery is easy. First, make sure the device you're using it in is turned off. Then, carefully place the battery into the battery compartment, aligning the solder tags properly. When it comes to safety, always keep the battery away from heat and moisture. Don't try to open or disassemble it as it may cause a short - circuit. To maintain its performance, if you're not using the battery for a long time, store it in a cool and dry place. If you notice the battery isn't holding a charge well, it's time to replace it.