I have been experiencing slow/weak crank when starting the car. The guy I bought it from works at pep boys, iirc he said he replaced the battery within the last year. I went to AutoZone and had them test my battery and alternator and they said they are both good.

Went across the street to hardware store to get a nut for my windhsield wiper (I used it for my alarm siren) and when I went out there to start it, it cranked really weak and stopped. And I turned it off and started it the next time.

I went to O'Reilly and and they tested it. They said both are good, he said battery was slightly weak (93/100).

I have a vacuum leak from the passenger side breather hose (ordered oil catch can from needs wings) I doubt this would cause weak crank though.

I have read that the car is sensitive to weak battery and I should just replace it. Correct? Somewhere I read not to use certain type batteries (only OEM? Don't use OEM?)

I was going to get one at Walmart because they have 5 year warranty 3 free and 2 pro rated. I assume as long as I make sure it isn't one that's been sitting it should be okay?

Last but not least, I do have an aftermarket sound system. And my amp/sub hasn't been working. It's a crossfire 12" subwoofer XT2 (1000 watt competition sub) with a gravity amp gpower 1300.2.

What do you guys think?