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DC Power alternators have been:

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Yes a second battery will be an extra load on your system when it is not actively supplying current.

It will supply extra current when the stereo is cranked beyond the capacity of the alternator. It will consume current when the system is not demanding as much current.

The battery will charge to 12.8V when the alternator is at 14.4V. The voltage drop of 1.6v will be dissipated as heat through the battery.

A second batteries function is to allow you to play music longer with the engine off and it can supply extra current on demand, but also taxes the system at idle.

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