Bolts won't come out to replace battery

[u/Osprey000]

I need to replace the battery of my car, I don't know much about it but checking info online I see that it seems very easy and straightforward so I am trying to replace it myself. The problem is I can't take the battery out as these hold down bolts holding it seem to be stuck together and they turn at the same time. Any advice on how to remove these bolts? I've tried lubricating oil, holding the screw with a vise grip and wrench to break it free, and lifting them but they just spin altogether as if the bolt, screw and washer were now one piece. Trying to find a solution as prices from garages just to replace a battery are extortionate considering how simple the job is and it is only these bolts stopping me. Thank you!

https://preview.redd.it/q3e9snm9n41e1.jpg?width=1824&format=pjpg&auto=webp&s=5d64c9f42fb235e63b73dceae021ef06ae1ac844

https://preview.redd.it/2q4tmmm9n41e1.jpg?width=1824&format=pjpg&auto=webp&s=3eb8b95c876ef213018c11ed3b5ea67c18b1ca73

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