How to test working capacity of battery: not technical

There was a time when I believed in the high current 'reconditioning'
Done by some of the homebrew devices used by off grid solar users

I don't think it is the pulse frequency that does anything
I think it is the high current pulse that does this
"High amps" not milliamps

It is away to shock? Inject high amps without overheating the plates and electrolyte

Pwm solar is just a 'switching power supply' a way to control the voltage
Like cell phone chargers and RV converters