sedan struggling to start

[Sir A.Y. Atoyot]

Originally Posted by AlexNet0

cracked? I would replace it. I have had "secure" (not really tight) battery connections cause intermittent cranking, however when properly secured, (tight, not able to wiggle, move, etc.), the problem went away. not this car, fyi, but an issue I have seen regardless.

The terminals can be as tight as you like, the real issue is whether or not they are clean. Not the outside - the inside that contacts the post on the battery. The only way to find out is to remove the terminal clamps from the battery and clean the insides of them, along with the battery posts, using sandpaper or a wire brush. Get both inside the clamps and outside the posts perfectly clean and shiny. If there are any deposits left, scrape them off with an old knife or something. Coat the surfaces with Vaseline and tighten the clamps. You might need new bolts and nuts.