I think a reconditioned battery is simply an abused battery still in the warranty period, chronically undercharged and returned by an indignant, but incredibly ignorant owner who makes such a stink, they give him new batteries just to go away.
The seller then performs a conditioning cycle similar to lifeline's procedure on the battery and tries to lower their loss from warrantying the battery in the first place.
I would so despise being in a position to make the modern consumer happy.
I wouldn't buy reconditioned batteries. Who knows how badly they were mistreated by the nimrods which make up so much of the battery buying public