Battery Low notifications via MQTT

Hi all - I have a small home setup which is generally working fine. I have seen Battery Low events in the console window but am unsure whether or how they are notified by mosquito. I can see state changes in MQTT listeners because I have the following in openhab.cfg


but is there a special syntax for subscribing to battery low events?



I imagine more information is needed about your devices and how they are set up e.g. which topics they publish low battery notifications to