So there's a stock carriage bolt with a hole helpfully cut in for a small allen wrench which bolt holds the back tab down on the stock seat.  If you're lazy like me and wait almost three years (and yes, the bike has seen rain) to loosen that bolt for seat removasl recharging the battery becomes way more difficult than it should be.  That carriage bolt's still frozen (despite getting an industrial sized hand screwdriver on it and turning it one full turn - now truly fubared i imagine), but the battery is recharged, bike is running great and the first $1,999 someone waves in my face takes it all home....

I googled "quick pins" but do not understand how you could make them work. Enlighten me please?

drill out the holes big enough to push the quick pins through,  then all you gotta do is remove that bolt at the rear tab, pull the pins, and bob's yer uncle!

those look easier to pull out than mine - i have the kind with the spring loaded bead and the wire ring - like  your top pic above.

 they work great, but sometimes a little tuff to remove - still way easier than taking out the bolts