Reconditioning as you and CTEK call it is often called equalization by others. In any case it is a process that is used (mostly on flooded cell batteries) to over charge the batteries by raising the voltage until the electrolyte in the batteries starts to disassociate (boil in laymen's terms) and release hydrogen. The "boiling" action stirs up the electrolyte and puts any sulfate that has precipitated out back into solution thereby returning the battery to almost new condition.

This procedure has its adherents and its naysayers. I don't know. In theory it makes sense, but we all know about theories. In any case the current needed is much more than 3 amps. For the size of batteries you are talking about, the full 25 amp capability of the charger makes sense to me. And with other appliances drawing amps at the same time, it is surely going to take more than 3 amps.

One year old batteries can sulfate even if they have never been severely discharged. Every time a battery discharges, even a little bit there is a chance of sulfate precipitating out especially if left partially discharged for long.

And even though I am ambivalent about equalizing flooded cell batteries I am quite sure that it doesn't make any sense for AGMs. IMO, the chances of harm are much greater than any potential gain which is mininal in any case.

So you pays your money and you takes your chances with reconditioning or equalization.

David