A Lithium Ion Battery Fire can be as hot as 1,000 F which is pretty hot.
To extinguish a Lithium Ion Battery Fire you need to use a Halon Fire Extinguisher to put the fire out and then it's very critical to cool the battery off after the fire has been extinguished since the hot Lithium Ion battery can potentially reignite due to the 1,000 F temperature it can reach when on fire.
1,000 F is higher in temperature than your oven at home can reach.