How to replace the battery in a Nissan LEAF Key Fob i-Key Intelligent Remote.
If you have started to see on your dash an indicator of the battery level and periodic messages that your “key is not detected” it is time to spend $4 to replace the battery on your fob.
The replacement part is CR2025. Energizer makes them and they should be available at most drug stores.
Nissan Key Fob Battery Replacement