Misconceptions related to fires in electric vehicles may challenge the widespread adoption of electric vehicles and as a result also hinder the required transition from fossil to renewable fuels. In this work the focus is on the extinguishing water resulting from suppression of fires for both battery electric and conventional vehicles. The aim of this project is to provide a foundation that can be used for relevant risk assessments regarding fires in battery electric vehicles. A literature search, large-scale vehicle fire tests and one battery pack fire test were performed at RISE, Borås. The obtained knowledge will hopefully support the fire and rescue services to execute effective firefighting tactics and provide further insight into how the chosen tactic may affect the environment. Three large-scale vehicle fire tests and one test with only a battery were performed. Vehicles used for the fire tests included one battery electric vehicle (BEV), one conventional internal combustion engine vehicle (ICEV) and one vehicle where the traction battery had been removed. The vehicle without energy storage was used in a free burning test without addition of water (reference test), the remaining tests were performed having a sprinkler system active. All vehicles were of the same vehicle model, from the same manufacturer, and manufactured in the same year, which enables good direct comparison between the vehicles.