Did you check the water level before & after charging????
The battery may be history, as trying to use the vehicles alternator as a battery charger isn't a good idea for either one.
The alternator isn't designed to recharge a completely discharged battery, as it's designed to put out mucho amps for a short period of time, like quickly recharging the battery after a start.
So using it on a completely discharged battery, it was pumping many amps into the battery, which can overheat & damage both.
All those amps can boil the electrolyte out of the battery, over heat & warp the plates & cause them to shed excessive amounts of material which can cause the cells to be weakened, or electricaly short out. The high chargig amps for an extended time, will overheat the alternator.
Deep discharging the battery causes sulfation on the plates & if it gets thick & hard enough, the battery charger just can't break it down to put the acid back into the electrolyte, so it won't take a charge!!!.
Starting batteries aren't designed for deep discharging & if done to extreems, it might even have reversed it's charge, which isn't good either & would likely not be recoverable.
It would have been best to have pulled & recharged the battery slowly, at about the same rate that it was discharged, or at about 4-6 amps.
Anyway as suggested, you could have the battery & the alternator tested, most autoparts stores do it at no cost..
I had to replace the battery in my 94 last year & had to give up on Motorcraft batteries, as they were way out of sight on price around here. Got the best deal at Walmart, on a like size & warranty on an Everstart, made by Exide, but it was $30 less than the best price my Motorcraft distributor made, so for the first time in it's life the Taurus doesn't have a Motorcraft battery!!!! lol
Let us know how it goes.