A business imports Teslas, strips the batteries. A single Tesla battery can be split into 10-12 household rechargeable batteries that can power lights in an apartment for up to 10 hours.
The Ukrainian power system has been damaged to the point where the power is only on for 4 hours a day in some areas.
Perhaps, as the medium shall fulfil either of both tasks, keeping oxygen out and cooling, the others are not effective enough in cooling.