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<blockquote data-quote="Vagomire" data-source="post: 7893536" data-attributes="member: 626999">Hey I&#039;m sure this has been posted a hundred times before but here&#039;s my question.I have a small car with a 90amp stock alternater. I&#039;m putting a 1700w RMS amplifier in it lol. I have heard four different things. 1. Dual batteries must be the SAME battery otherwise voltage will be off and they fight each other.2. Dual batteries have to be the same TYPE of battery (ex. Sealed Lead Acid).3. It doesn&#039;t matter what size or type of battery either one is, one should be deep cycle though.4. Just get one huge *** battery for the trunk and take the hood battery out. I&#039;m asking because I have a Duralast acid battery under the hood and I don&#039;t know how well two of those would work for such a big system. Another question, just ground both batteries to the chassis or run a pos and neg wire between the two in addition to chassis ground?</blockquote>

[QUOTE="Vagomire, post: 7893536, member: 626999"] [COLOR=firebrick][B]Hey I'm sure this has been posted a hundred times before but here's my question.[/B][/COLOR] [COLOR=firebrick][B]I have a small car with a 90amp stock alternater. I'm putting a 1700w RMS amplifier in it lol.[/B][/COLOR] [COLOR=firebrick][B] [/B][/COLOR] [COLOR=firebrick][B]I have heard four different things.[/B][/COLOR] [COLOR=firebrick][B] [/B][/COLOR] [COLOR=firebrick][B]1. Dual batteries must be the SAME battery otherwise voltage will be off and they fight each other.[/B][/COLOR] [COLOR=firebrick][B]2. Dual batteries have to be the same TYPE of battery (ex. Sealed Lead Acid).[/B][/COLOR] [COLOR=firebrick][B]3. It doesn't matter what size or type of battery either one is, one should be deep cycle though.[/B][/COLOR] [COLOR=firebrick][B]4. Just get one huge *** battery for the trunk and take the hood battery out.[/B][/COLOR] [COLOR=firebrick][B] [/B][/COLOR] [COLOR=firebrick][B]I'm asking because I have a Duralast acid battery under the hood and I don't know how well two of those would work for such a big system.[/B][/COLOR] [COLOR=firebrick][B] [/B][/COLOR] [COLOR=firebrick][B]Another question, just ground both batteries to the chassis or run a pos and neg wire between the two in addition to chassis ground?[/B][/COLOR] [/QUOTE]

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