I have an optima yellow top that's probably 5 or 6 years old. My alternator went out the other day and ran the battery down. I replaced the alt and then tried charging the battery. I put it on a 10 hour trickle charge.
I put it in the car to start and got nothing. Pulled out the DMM and it's sitting on 13.x. I then try jumping my car off with my truck. It starts, runs, drive it around the corner and come back. Turn the car off and it won't start, yet battery still has plenty of volts.
I put that battery into my truck (the YT is dual posts) and it won't start the truck either (which eliminates bad cables in the car).
I don't have a battery I can try in the car because no one seems to have a side post battery.
Suggestions on things I can try? Or is the battery toast. If toast, why does it sit on 13.x volts?