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Stranded at auto parts store. Car has been slow to Starr. Came to get battery checked. Now when start button pressed...only one click then nothing. Battery tests good. Same click with jump box.
The simple/easy things to check are the battery terminals, be sure they are tight. Don't over-tighten the goofy little nuts and definitely don't remove them, just try to twist/wiggle the terminals to see if they are loose. If loose, you can take them off and use small pliers to bend the "collar" inward a little to snug it up, or just wrap a piece of aluminum foil over the post to get home.