First I'd have taken it back to them, sounds like it missed an assembly step.
You can test the battery if you have a volt/ohm meter. insert one electrode in one cell and the other in the cell next to it, you should get 1 1/2 volts between each set of cells. don't touch the lead in the cells just the water/acid.
The smell test should tell you if there is acid in the cell.
If there is no acid then you won't have a charge after having the charger on it for a few hours.
Take it back and have them check with a hydrometer