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Lithium batteries present the "fastest growing" risk of fires, a Welsh fire and rescue service has said.
The batteries, and specifically lithium-ion batteries, are used to power a number of devices including e-bikes and scooters and their chargers, mobile phones, laptops and e-vapes.
Campaigning charity Electrical Safety First said fires caused by substandard e-scooter and e-bike batteries were "tearing through homes" and want stricter rules to be introduced around their sale to reduce the risk.
The UK government said it was updating product safety laws around the batteries to help keep people safe and taking action at ports and borders to stop unsafe products reaching consumers.