Battery terminal n connections

What is your question?

My terminal on the black post of my battery wouldn't stay tighten n I would lose power. So I replaced it with a new one. Well that one wouldn't tighten at all n was stripped. So I replaced the buttery with a new one n new terminal bolt, which was the short one that should of been in it in the 1st place.the old one was a diesel bolt with a bunch of washers on it. Well it started right idol fine but the battery indicator was at 12-13 & kinda was bouncing around a little. Well I put my signal lights on the battery warning lite came n n dropped to the bottle n it would go up alittle when shut it off. Then it killed n wouldn't start. Like it was getting no gas. Then when it did it was hesitating to start like it was suffocating n n wouldn't fire over. Cables are all tight on the battery. I lost