Firefighters have issued a safety reminder on the safe use of batteries and chargers following a fire at a flat on Poynders Road in Clapham.
A flat on the third floor of a four-storey block was damaged by the fire. There were no reports of any injuries.
The Brigade's fire investigators believe the blaze was accidental and caused by a fault in a battery unit for an electric bike which was on charge at the time of the fire.
A London Fire Brigade spokesperson said: "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 and charge them safely.
"Unplug devices once they have finished charging and make sure you use the right charger for your device."
The Brigade was called at 2253 and the fire was under control by 2351. Fire crews from Clapham, Tooting and Battersea fire stations were at the scene.