I am trying to charge a '96 Lumina battery with the battery in the car. I am asking whether I need to remove the 'positive and/or the negative' cables from the battery before attaching the 12V charger. The battery is hidden and so it is very difficult to get to the terminals -much less disconnect them and then try to put a bolt in the side term's to allow the charger clips to be attached. You have to remove one of the body braces, the windshield washer reservoir, and the fuse panel and the air filter housing has to be loosened and shifted just to remove the battery. I had one auto discount store say they couldn't replace the battery for me, when I purchased a new battery!