I think that below results indicates I'm on the correct track. Mael is right and his method works (I want to say it works perfectly but I have to wait for further experiments so I dont give rushed conclusions). Having this battery analyzer can now confirm the results, and I'm happy with the first measurements. If it wasnt for Mael, SeaMonky, Mark from the other forum and everyone who helped my, I wouldnt be here today, so warm thanks to every one from deep my hart.
I would like to highlight that this battery analyzer compensates state of charge (SOC) and temperature, so readings should be as close to real as possible, even if it wasnt very close, they will be enough for comparison.
The battery: MF (maintenance free) 12V/ 55Ah / 470 CCA.
V = 12.73 ----> SOC=100%
CCA = 393A ---> BL (battery life) = 34%
IR (internal resistance) = 6.74 mOhm
Impedance 148 simense (I dont know what the hell is this, but I only know that the greater this reading is, the better the battery is, it is related to IR.
12 hours pulsing at 48 Hz, duty cycle of 10.6%, 1000VA transformer, 47,000 mF capacitor bank, 555 pulsar driving a 20A Japanese relay (I dont know how long this relay will last, time will tell but I know that most relays will last about 100K click as I remember ---> 33 hours continues use with V and A within specs )
Off the pulsar and after 2 Hrs rest I retested the battery:
V = 13.03 --->SOC = 100% (But I expect this to drop a bit by time.)
CCA = 454A ----> BL = 82% (THIS IS THE INDICATION I WAS LOOKING FOR AND THIS IS A GOOD ONE)
IR = 5.82 mOhm (another good indication)
Impdn = 171 MHO
All results are fine, but I must be honest, the battery and although most probably not able to start a car, but it didnt have any internal shorts, I can assure that as the last time I charged this battery was few weeks ago and yet, it's V was 12.73V after all that time, if it had internal shorts, V would drop fast.
I will take more measurements later, if CCA became stable, then this battery can go back to service.
Again, thank you all for your help
I still have a question: anyone know if there is a formula to find CCA of a battery given only it's rated Ah capacity? even roughly? I have several batteries that are only rated in Ah. I remember I read this formula in the past but cant find it again.