Hello guys!! I sincerely hope we can resurrect my project limo, I have been working my butt off for over a year getting it and saving up to fix it!

So I disconnected my battery, replaced my spark plugs one at a time (reusing the old coils since I'm broke and this was just to get the car derivable to a convention I'm going to), gapped each one perfectly, everything went beautifully. However, after plugging the battery back in, and trying to start it- nothing, click, then all electronics die, like the battery is dead-dead.

I use my jump starter, letting it sit there for up to 20 minutes, nothing, barely turns over. I check my spark plug job, everything looks beautiful... I don't know what happened?? I tested the battery, it's perfect, had it even tested at autozone, perfect.

Only possible hint is the battery would occasionally not hold a charge the last few months, but was totally random... (The car is hardly started/driven this year as it's a project)

Video showing symptoms and a clear picture of the engine bay, maybe you guys see something I missed???

(sidenote, this is a stretch limousine conversion, there will be extra wires/accessories around) - The items at the very far passenger side hugging the fender have always been disconnected since I got it, and they appear to be for the stretch accessories, not required for vehicle operation)

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I really appreciate you!!