We've spoke of this before - but losing weight on the porky V Rod only matters to those that value a lighter bike. For real H-D bikers that weigh half the bike, why bother ? For guys that weigh a quarter of the bike weight, yea, it helps.
9.6 Lbs of up high weight for $150 more than a regular battery is only $ 15.50 a Lb.
20 Lbs on an exhaust system for $ 850 is $ 42.50 a Lb.
3 Lbs of weight a wheel, two @ 6 Lbs for $ 1600 is $ 266 a Lb.
5 Lbs of weight a wheel, two @ 10 Lbs for $ 2500 is $ 250 a Lb.
So yea, IF you value weight loss, you can't beat a Lithium or LiFePo Battery, Lbs lost per $. I recommend the Earth-X, a much more stable version. Love mine. Weight is Evil. Weight reduces M/C Fun. Get rid of weight ( whatever you can afford ) you'll be happier, IF it matters to you. IF not, don't worry about it -