Car Battery Acid Burns

alternator problem or an electrical problem?

I was sitting in the drive until today when my battery light came on. I also felt a very distinct smell from the engine. He felt like acid burns (I guess that's what the acid burning smell). Anyway, when I accelerated the battery light turned off, but when I slowed it restarted. When I got home I tested it by rolling the windows and once they were closed, I continue to take down (always sends a jump in my car) The light came on when I held the buttons down. But when I turned my radio off lights off and the light does not light when I pressed the buttons of the window. Is it an electrical problem? I tested the battery a week ago and tested it fine. I had problems once every few weeks to start the car and can not understand it could be. I'm afraid to drive it because if Autozone alternator I do not want to drain the battery, then I'm on the road. Your advice is appreciated.

with the engine running disconnect the positive wire to the battery if the engine dies, you need an alt.

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