Just measured my Optima Red Top... 39.8 lbs. There's an easy 20+ lbs without even going to one of the super small options.

I like Andy's idea of the clamp-on ammeter to do spot-checks on charging characteristics.

2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)

1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)