Lights on for 6+ hours. Charged several times, battery is new, car won't start.. on 2005 Mini Cooper

We used three different chargers, so it's not a charger problem. What could be the problem?

Asked by for the 2005 Mini Cooper
2 answers
You need to test the charging system and the battery with proper equipment. Battery could still be dead.
Hal is right...Is it a AAA battery? Not quality battires!