I am no engineer either, however from you description of the battery I doubt it's any better than the normal stock battery.
Is it a Panasonic battery? Those are damn good batteries and will last a long time, but nothing special, all the 4runners I've purchased have had them.
Here's a quick read on liquid vs AGM batteries
One more here
Google can find hundreds of articles on choosing the right battery for just about any application. I think a lot of us go with AGM, but to each his own, as that adds a different set of issues for some.
