Might be different for various lithium batteries but here is what Tesla's Emergency Response Guide recommends: USE WATER TO FIGHT A HIGH VOLTAGE BATTERY FIRE.

Might be different for various lithium batteries but here is what Tesla's Emergency Response Guide recommends: USE WATER TO FIGHT A HIGH VOLTAGE BATTERY FIRE. If the battery catches fire, is exposed to high heat, or is generating heat or gases, use large amounts of water to cool the battery. It can take between approximately 3,000-8,000 gallons (11,356-30,283 liters) of water, applied directly to the battery, to fully extinguish and cool down a battery fire; always establish or request additional water supply early. If water is not immediately available, use CO2, dry chemicals, or another typical fire-extinguishing agent to fight the fire until water is available. NOTE: Tesla does not recommend the use of foam on electric vehicles. Apply water directly to the battery. If safety permits, lift or tilt the vehicle for more direct access to the battery (see chapter 2). Water may be applied from a safe distance ONLY if a natural opening (such as a vent or opening from a collision) already exists. Do not open the battery for the purpose of cooling it. Tesla does not recommend placing the vehicle in a large container full of water. The use of a Thermal Imagery Camera or Infrared (TIC or IR) is recommended to monitor battery temperatures during the cooling process. Continue to use water until the battery has reached ambient temperatures or below, indicated by the thermal imagery camera. When utilizing a thermal imaging camera, allow enough time, once the application of water has stopped, to allow for heat within the battery to transfer to the battery enclosure. https://www.tesla.com/firstresponders https://www.tesla.com/firstresponders Source (pg 25): https://www.tesla.com/sites/default/files/downloads/Model_3_Emergency_Response_Guide_en.pdf https://www.tesla.com/sites/default/files/downloads/Model_3_...