I Have observed after 3 separate tests using 3 separate 250AH , 12V sealed batteries that while CCA increases  usefully after only one cycle of Regeneration, The Ah capacity increases  in steps of about 25% with repeat Regenerations.

For instance at the onset the Battery was at 50Ah capacity, 225 CCA

Regeneration cycle 1 = 75AH , 400 CCA

Regeneration cycle 2 = 90Ah, 400 CCA

When I speak of regeneration ..that applies to the automated product based,in part, on the circuit presented here. Here are the main principles of the micro-controller run system.

The regeneration cycle is as follows:

1) Initialization =>  battery tests for Voltage & Impedance

2) Viability cycle => discharge to 11.9V for a 12V battery or 5.95V for a 6V battery

3) Pulsecharge at C/20  until the battery is up to 13.2V

4) Absorbtion test => 20 minute discharge at C/20  to validate battery voltage >11.9V or 5.95V for a 6v.

6) Pulse charge & reflex charge in stages with thermal/voltage sensing feeding Pulsewidth control and Amperage.

6A) Ensure a minimum absorption voltage (14.4V, temp. corrected, achieved  and then voltage limit to 14.1V for 2 to 8 hours depending on size of battery.

7) Battery rests for 15 minutes and is  discharged  at C/8  to C/13 for 2 hours and capacity calculated based on Peukert analysis.

8) Pulse charge  again with a 2 hour absorption/voltage controlled profile termination.

9) Rerate CCA and report on battery AH.input, final AH capacity (C/20)  , resting V, temperature  and CCA & Impedance.