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You can use L-brackets for this which is good enough or you can remove the drivers and bolt the box directly to the vehicle. This is particularly true if you are driving an older model car. If your radio does not have audio outputs of its own, you will need to purchase an amplifier that can accept a speaker-level input or you will have to get a converter that will convert a speaker-level signal to an audio cable signal.

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Basically it will provide you the additional capacity to run your stereo longer without starting the vehicle. An amplifier turn on wire will also have to be connected behind the radio. Alternator Most of the time that you find that you are experiencing frequent dead batteries, this is a sign that your electrical system isn't keeping up and you may need to upgrade your alternator. For example, if you need to figure out the current (amps) moving through a 12 volt circuit and you know the resistance of the circuit is 4 ohms; the equation would look like this: E = 12volts I = unknown R = 4 ohms I = E/R or I = 12/4 which is I = 3 ampsP = E*I (power equals voltage multiplied by current or watts = volts amps).