Your BoxLock charges using a USB-C cable, included at shipping. There is a USB-C port on the bottom of the lock, located next to the scanner.
To confirm that the lock is charging, you can look at the bottom of the lock itself. While charging the LED at the bottom will be illuminated green and once the lock is fully charged, that light will change to yellow/orange.
Once fully charged your locks can last for several months (up to 12) depending on configuration. You can monitor the percentage of the battery on each lock in BoxLock Control, as shown below.
Note : If you see a lock that's reporting a low battery and you don't see any activity from the lock over recent periods of time, it's very possible that the battery has died. Charging locks before they are red in Control will reduce service interruptions for this reason.