i like using deep cycle on my hobby cars once the factory battery dies. aftermarket or not it really depends how you take care of the battery... like keep it on a manager while the car is not in use for a week or so... or if you do constant short distance driving... or, keeping a charger on the battery while you are tuning your stereo or working on electronics while the engine is off.
but for quick voltage regulation for stereos dont you usually want to use a capacitor?
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