Monimoto comes with two CR123A primary batteries that can be easily found in most convenience or photo equipment stores. Once the battery level reaches the critical level (don't worry, you will be notified), simply open the enclosure, remove the old ones, insert new, and close the enclosure.
IMPORTANT: You must not use rechargeable batteries if you find any for sale at all. They have a different electrical parameters and we cannot guarantee that Monimoto will work properly, nor that the correct battery level will be displayed.
Also - do not use new and old batteries together as this will lead to the false battery level indication in the app.
The Monimoto Key is powered by a 3V Lithium CR2450 one battery.