The blaze broke out at the rear of Mosul Way just before 5pm on January 17, destroying the shed and its contents – including two mobility scooters.
London Fire Brigade believes the fire was caused by a “catastrophic failure” of lithium batteries in the scooters.
The fire was brought under control by 5.31pm.
Four fire engines and around 25 fire engines were called to the scene, with crews from both Bromley and Orpington fire stations.
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.”
