
A picture would help a lot. There are various ways for a watch to get the electricity it needs to keep the clock work between button pushes. Most are fairly internal, not relying on secondary contacts between the batteries and the circuit, or the batteries and the case.
on the other hand....
Hughes, some later Frontiers, some 29mm Fairchilds, some Uranus: A side contact is used in the battery well where the negative side goes down, tapping off 1.5 volts just for the clock. If the module has a side contact like that and the [negative side down] battery falls out when you tip the watch over, the contact probably isn't making good enough contact. Gently bend the tp of the contact to strike the battery side better, problem solved(usually).