Factory and most aftermarket batteries ( some excluded) are NOT meant to deep cycle ( kill completely then recharge) if you do then you are definitely gonna kill the battery. It will hold 12 volts but will have next to NO amps to turn the starter. In every car I have had I replace the stock battery with a 1,000 CCA even though they say it wont fit, I make it fit. The Malibu is the only one I have not done this to. Since I used to be in competition and listen to the stereo fairly loud.
If you are killing the battery as you are driving home then I would seriously look at a bigger alt cause it is not putting out enough to charge your battery as you drive and run the car and you will find out shortly that you will toast your alt too.
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