Define 95% short in electrical terms.
Old school method was to disconnect the ground cable and rig up a small 12V lamp to connect in series between the ground cable and battery negative post. If the bulb lit up, you had a short. Intensity of the light was relative to the short.
With today's electronics, you need to hook up a milliamp meter in series as above and measure the drain.
FWIW, I would have the battery load tested. If the battery has been drained more than a couple times, chances are it is very weak and will not hold a charge for very long.
You may also have a dead cell which will cause the other cells to deplete their charge as well. In a wet cell battery(non-sealed) the best way to determine this is with an electrolyte tester. Alternatively you can remove the battery caps and hook up a battery charger. Observe the bubbling in the cells showing the cell is charging. A dead cell will have none or very little bubble activity relative to the other good cells.