A lot would probably be an understatement. Aren't most batteries in data centers designed to just hold load for seconds or a few minutes at a time while generators start up?
If the problem is an instant disconnect of a large load, switching that large load into charging batteries at that instant, for a minute or so, feels like a solution.
Why is this confusing? Batteries are both generator and load. If the grid needs load to stabilize frequency and voltage, batteries can become loads instantly.