if the new alternator is good it shouldn't drain anything from the battery, since the only time battery voltage is used is to turn the engine over to start it, other than that everything runs off the alternator, which alternates current, hence the name lol. but if your battery is dead once again after alternator has been replaced then there's either a wiring problem that is 1 shorting out alternators or 2 a parasitic drain, which means there's something draining the battery dead when the car sits, and if it's not a wiring problem then the correct alternator may be the 140amp instead of the 80amp.