Four fire engines and around 25 firefighters tackled a flat fire on Sutherland Avenue in Maida Vale.
Part of a ground-floor flat in a converted mid-terrace townhouse was damaged by fire. The fire resulted in the ceiling of a lower-ground floor flat collapsing. Two women left the building before the Brigade arrived and were taken to hospital by London Ambulance Service crews.
The fire is believed to have been accidental and caused by the failure of a lithium-ion battery for a power bank which was on charge.
A London Fire Brigade spokesperson said: “Lithium batteries are susceptible to failure if incorrect chargers are used, so it’s important to always use the correct charger for the product and buy an official one from a reputable seller.
“You should unplug your charger when you have finished using it and we would advise not to leave it unattended or charging while people are asleep.
“Batteries can present a fire risk if they’re over-charged, short circuited, submerged in water or damaged, so it’s really important to protect them against being damaged too.
“Try to ensure they are not getting knocked around while in use or while being carried as this can increase the chance of damage to cells.”
The Brigade was called at 1648 and the fire was under control by 1752. Fire crews from Park Royal, West Hampstead and Paddington fire stations attended the scene.