Four fire engines and around 25 firefighters tackled a maisonette fire on Lordship Road in Hackney.
Part of a split-level maisonette on the fifth floor of the building was damaged by fire. There were no reports of any injuries.
The fire is believed to have been caused by the failure of lithium-ion battery cells.
A London Fire Brigade spokesperson said: “Lithium-ion 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.
“Batteries can also pose a risk if they have been damaged, so try to ensure they are not getting knocked around while in use as this can increase the chance of damage to cells. You should also not expose them to extremes of temperature.
“You should always make sure you unplug your charger once it’s finished charging. Always follow manufacturers’ instructions when charging and we would advise not to leave it unattended or while people are asleep.”
The Brigade was called at 1602 and the fire was under control by 1709. Fire crews from Stoke Newington, Holloway and Tottenham fire stations attended the scene.