When Kat Hickey and her husband talked about what they would do if Tropical Cyclone Alfred knocked out the power in their north Brisbane home, they were more concerned than most. The pair have a nine-month-old daughter and a three-year-old son – having a reliable way to sterilise bottles and boil water for formula was critical. They knew the battery from their white BYD Atto 3 could power their home using the vehicle-to-load system (V2L) – a backup power system that allows the car battery to power appliances – but neither had actually hooked it up. They wondered how much