They make air exposure as unlikely as possible... but lithium exposed to oxygen auto-ignites and combusts. It is a matter of chemistry.
And if you leak coolant out of a gas engine, you crack the block, and stop. Maybe you need a new engine... maybe you need a new car.
If you leak the coolant out of a battery, your car bursts into flames so hot that it easily ignites everything around it... whether you are in the car, or in your bed, and your house starts on fire from the car in the garage.
You can't just go to a dealer to buy a new LIFE.