> How about this: charge if overnight again at 2A. Make *sure* it
> registers more than 12v and then leave it *unconnected* in the garage
> for a full day and then test it again. At least that eliminates the
> battery one way or the other.
>
If you can pop the filler caps off, see if it is dry.
Could be all the electrolyte has evaporated or leaked out some how.

If it is dry, add enough distilled water to get to the bottom of the filler
holes.