A home south-east of Perth turned into a furnace, swallowed by flames in minutes.
It happened in Forrestfield at about 3.30am today, while a couple, their 12-month-old baby and two dogs all slept inside.
The family escaped the blaze with only seconds to spare as neighbours raced to help.
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A 38-year-old man was taken to hospital, struggling to breathe.
The house was beyond saving and it's believed a lithium-ion battery on a power tool is to blame.
"The house is 100 per cent damaged, so its inhabitable," investigator Darryl Krammer said.
This is the 107th house fire caused by lithium-ion batteries so far this year.
It's a growing concern, with four of them happening across the state in the past 48 hours.
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"These are only the ones we know about, that we are being called to," Krammer said, suggesting there could be more.
"It is a forever increasing risk to the community."
Lithium-ion powers devices like portable chargers, electric vehicles, mobile phones, digital cameras, even vacuum cleaners.
The advice is to charge the items like power tools outside your home and install a smoke alarm in your garage.
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