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Car Audio Discussion
General Car Audio
Connecting a Second Battery
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<blockquote data-quote="helotaxi" data-source="post: 354902" data-attributes="member: 550915"><p>BS in the grand scheme of things. If your system is wired with adequate size cable the resistance of the wire going from the main battery to the AUX battery will be all but unmeasurable. Any difference in voltage between the two batteries will equalize almost instantly.</p><p></p><p></p><p>Which can damage batteries if they are not the same brand and model.</p><p></p><p></p><p>How do you "power" a battery? A battery is a current SOURCE. You might need to recharge it but two or twenty batteries will take the same amount of current to recharge as only one given the same total initial current draw and time. Adding an extra battery will not hurt a system. I agree that it will not FIX an inadequate charging system, only a HO alternator can do that, but it will not hurt.</p><p></p><p></p><p>This is basically what happens every time your battery goes from discharge to charge anyway, you know like when you start your car. You are not going to damage the battery by using an isolator, regulator or relay. The contacts on the isolators have a service life, though. They do arc a bit and after awhile the contacts can pit and corrode and no tlonger give a good connection. Relays are relatively cheap, though, and it won't break the bank to have to replace one every year or so.</p></blockquote><p></p>
[QUOTE="helotaxi, post: 354902, member: 550915"] BS in the grand scheme of things. If your system is wired with adequate size cable the resistance of the wire going from the main battery to the AUX battery will be all but unmeasurable. Any difference in voltage between the two batteries will equalize almost instantly. Which can damage batteries if they are not the same brand and model. How do you "power" a battery? A battery is a current SOURCE. You might need to recharge it but two or twenty batteries will take the same amount of current to recharge as only one given the same total initial current draw and time. Adding an extra battery will not hurt a system. I agree that it will not FIX an inadequate charging system, only a HO alternator can do that, but it will not hurt. This is basically what happens every time your battery goes from discharge to charge anyway, you know like when you start your car. You are not going to damage the battery by using an isolator, regulator or relay. The contacts on the isolators have a service life, though. They do arc a bit and after awhile the contacts can pit and corrode and no tlonger give a good connection. Relays are relatively cheap, though, and it won't break the bank to have to replace one every year or so. [/QUOTE]
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Connecting a Second Battery
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