The disclosure relates to a technique that enables a status of a battery in a smoking substitute device to be monitored through a portable communication terminal (e.g. mobile phone). The smoking substitute device is configured to communicate wirelessly with the portable communication terminal, e.g. via a wireless personal area network, to transmit status information concerning the battery. The status information is processed either locally or in the cloud to provide feedback or other notifications to a user of the device. Usage data may also be transmitted, whereby the battery status can be expressed in terms of a predicted remaining usage, e.g. predicted number of remaining activation events.