Six fire engines and around 40 firefighters were called to a fire at a warehouse on Red Lion Road in Tolworth.
A storeroom used for battery charging was destroyed by the fire. There were no reports of any injuries.
The Brigade was called at 2015 and the fire was under control by 2138. Fire crews from Surbiton, New Malden, Kingston and Sutton fire stations were at the scene.
The Brigade's fire investigators believe the fire was accidental and caused by the failure of a battery charging unit.