Under normal circumstances, your Jiobit battery will last 5-20 days. This is possible when the Jiobit is able to conserve battery when it's not actively on the move or detecting new cell signals.
Power Save Mode will only appear in the app when the device has not detected movement for an extended period of time. While it conserves battery in preparation for its next movement, Power Save Mode will still show the location of the device.
Don’t worry— as soon as movement or a new signal (like a Bluetooth connection, Wi-Fi access point, or cellular tower) is detected, the Jiobit will leave power save mode and notify you of any movement.