I can tell you. The battleground counties were mainly rural/small town counties which have been trending right. Dur to political realignment they will never be battlegrounds again.
This was offset by Trump’s weak performance in populous suburban counties, such as Chester/Montgomery/Delaware PA, Cobb/Gwinnett GA and Oakland/Kent MI.
The pattern was similar in most states: urban and rural areas were similar to 2016, but Biden did better than Clinton in suburban areas.
Then he would have done poorly in places like Bucks County PA, but he did not. Reason being is that outright fraud could not take place there. Only in inner city places. I personally know a dem candidate who got crushed in one of these swing suburban areas and the family will be in debt for a long time because they were sold on a bill of goods.