Ls1 crank relearn

[anniversaryss]

What conditions are needed to require a crank relearn.
Ive read having the ignition on and draining the battery can be one of them.

Hers my problem. Car ran fine but i wanted to check some things out. I pulled the spark plugs and also pulled the ignition and pcm fuses. I bumped the motor over a few times to move a piston to inspect it with a boroscope.
I also replaced the battery bc a stripped post.

I put it all back together and it runs like crap.
Pull the plugs again and they are all diff. Some look like they've fired, some look as if they never fired and some like they have barely fired.

I do not know whats up as it ran fine before this.

Its a 24x system on an lt1.

[anniversaryss]

Btw all my misfire codes including the crank relearn and p0300 are all deleted. So not sure if that effects things here.

Edit i actually enabled p0300 on the ride before this and it woild stumble at certain rpms hence why i checked plugs, tho i never had a misfire count move from 0...