Supercap Module
The Supercap module (datasheet) is a module designed to keep a device powered during an average time of 2 minutes after a power failure. It allows to send critical alarms to alert about electrical failures.
Once the device is externally supplied, the charging of the battery is automatically activated and it takes less than 1 minute to reach the maximum capacity.
If you want more information about Supercap API, please check here.