There cannot be a "compatibilty issue" with a battery and the OS. You battery could easily have failed after that period of time, although it is a +/- situatio - some go on literally forever. But, what was the useable period of you battery, without charge, before? ½ hour seems not to bad. I have two laptops and neither will go that long??
But, before dipping your hand in your wallet, check that you havn't dislodged an outside connection through your cable and battery pack to the main power.
P.s. I am not sure of the intention of Hannakelly's pst, but I cannot see that a reinstall will help you in any way.