Three family members injured after faulty e-scooter battery sparks house fire

One person is in a serious condition and two others have been injured after a faulty lithium-ion battery sparked an "intense" fire in Sydney's south.

The blaze engulfed a garage and part of a home on Prices Circuit in Woronora about 3am today.

FRNSW believes the fire was sparked by a faulty lithium-ion e-scooter battery.

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"The likely cause here was an e-scooter on charge. Fire and Rescue NSW has responded to more than 80 of these types of incidents this year alone," Superintendent Adam Dewberry said.

The fire started in the garage and quickly spread to both floors of the home, as well as into the bedrooms where a family of five was sleeping.

The youngest of which was a four-year-old girl.

They managed to get out of the home, however, three people were injured.

A 68-year-old great-grandmother and a 53-year-old man were taken to hospital for smoke inhalation and were released earlier today.

A 52-year-old man remains in hospital with serious burns to his legs.

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Two people have since been released, while one remains in a serious condition.

Neighbour Julie Parlett said she could hear the flames crackling early this morning.

"I woke up and I heard bing, bing, bing," Parlett said.

"I looked and... Oh my god, the house across the road is on fire

"Nothing [like this] goes on in Woronora, [it's] a quiet place."

Three fire trucks and 12 firefighters battled the flames for 90 minutes before it was brought under control.

Firefighters called the blaze "intense" and said the charging of the battery failed, causing it to go into a "thermal runaway", starting a fire.

"It's a significant concern. They're a great convenience to the community but they do still come with some risks," Dewberry said.

"What we're asking people to do is be really careful where you are purchasing your devices, your e-scooters and e-bikes from."

The blaze marks 81 fires caused by a mobility battery this year, averaging two a week, FRNSW said.