Lithium ion batteries go into thermal runaway. The flame can be somewhat suppressed by displacing oxygen and/or spraying shit on it to prevent the burning of material. But it's still going thermalnuclear and putting out incredibly hot gasses. The only way to suppress it is by dunking the batteries in water to sap the energy out of them.
That's why in high-quality DCs, battery backup is in a separate room with good fire isolation from the IT space.
Yes, the servers still have some small batteries on their mainboards etc, but it's not too bad.
Much harder, but not impossible.
Lithium ion batteries go into thermal runaway. The flame can be somewhat suppressed by displacing oxygen and/or spraying shit on it to prevent the burning of material. But it's still going thermalnuclear and putting out incredibly hot gasses. The only way to suppress it is by dunking the batteries in water to sap the energy out of them.