The battery installed by CD in the SR20 might save them $20 to $30, weighs 1.5 pounds more, and needs probably another .5 to 1 pound for its drain.
A modern recombinant gas technology battery could have saved a couple of pounds and simplified the manufacturing and documentation of the aircraft.
It would also give better service through longer life and no maintenance.
Plus it holds its charge much better when not used for a period of time.
If I could purchase useful load for $10 to $15 a pound with no additional fuel consumption, I’d gladly purchase 300 or 400 pounds worth right now.
It’s even more a pity if they are using the old lead antimony battery in the no vacuum SR22.
The “new” recombinant gas technology (lead calcium) is what has been called low-maintenance and no-maintenance (sealed) and has been around for years in automobiles.