HelloCustomer you have what is called a parasitic drain,something is remaining powered up when you shut your engine,and it drains the battery overnight. I am sending some info on this problem and some testing that needs to be done to find a problem like this. As a quick test to prove this is your problem, and not a defective battery,next time you use the car,when you park it,disconnect the battery,next day reconnect it. If it starts you know for sure a drain is the problem.If it doesn't start,the battery is your problem. Here is the testing info,if you have a drain,Thanks for using Just Answer,Jerry.
Hi Here is a picture of the cap,it is a flat type mounted on top off the distributor in the back of the engine.