Five fire engines and around 25 firefighters responded to a fire on Saffron Square, Croydon.
The fire occurred in a studio flat on the 16th floor of a high rise block. A woman left the flat before the Brigade arrived and was treated on scene by paramedics from the London Ambulance Service.
The Brigade was first called about the fire at 1831, and crews from Croydon, Norbury, Woodside and Wallington fire stations were sent to the scene. Firefighter shad the incident under control by 1918.
The cause of the fire is believed to have been accidental, caused by the failure of a lithium-ion battery.