to be honest you should at least get an interior light to come on, unless something has drained your bat completley, if it's so low that it does nothing, it'll take a good 24 hours to charge up
check the voltage of the bat if you have a volt meter, based on what you say, it should be way below 8v, if it is, charge it, put it back on, start car and check the voltage again while the car is running, it should be reading around 14.6, if it's still reading 12 ish, your alternator is on the way out
it is very odd that a bat goes that dead