Car acts dead after it gets hot...

Usually I use a BFH and give it a couple of wacks (bumps) right here.... but some people like to use a large screwdriver like this...

Just kidding... I only use the bfh... I mean screwdriver method lol. :p

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I see you don't have a battery hold down. You can (and should get one) get an inexpensive one at an auto parts store. If you ever hit the brakes hard or someone hits you, the battery will fly around. Not good.