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<blockquote data-quote="TDot" data-source="post: 7922032" data-attributes="member: 645311">I&#039;m thinking of putting a battery in my trunk so I can play my music, or maybe watch a movie off my carputer when my car is off with no worries. My amp maxes out at 80 amps and 1600 watts (only 900 watts RMS, but will never pass 550 watts RMS according to all my speakers, so I suspect I shouldn&#039;t hit more than 30amps very crude calculations and assumptions), the carputer maxes at 10 amps and generally doesn&#039;t see more than 4 amps if I remember correctly. So I&#039;m looking at a max of 90 amps which I&#039;ll never reach, and I believe an average use of 20-40 amps.1/ Beyond the simple notion of &quot;more is better&quot;, shouldn&#039;t I be fine running a 4awg wire to the second battery?2/ I really don&#039;t want another big gauge wire running down my car, so why exactly do I actually need to ground back to the primary battery instead of a good place in the back...prob where the factory amp is grounded to?3/ If I chose to upgrade my battery with one of these fancy $250 batteries instead of running a second battery, is it possible to get 60min of playing time out with no issues or worries of starting the car after (considering the setup I have)?Thanks.</blockquote>

[QUOTE="TDot, post: 7922032, member: 645311"] I'm thinking of putting a battery in my trunk so I can play my music, or maybe watch a movie off my carputer when my car is off with no worries. My amp maxes out at 80 amps and 1600 watts (only 900 watts RMS, but will never pass 550 watts RMS according to all my speakers, so I suspect I shouldn't hit more than 30amps [I]very crude calculations and assumptions[/I]), the carputer maxes at 10 amps and generally doesn't see more than 4 amps if I remember correctly. So I'm looking at a max of 90 amps which I'll never reach, and I [B]believe[/B] an average use of 20-40 amps. 1/ Beyond the simple notion of "more is better", shouldn't I be fine running a 4awg wire to the second battery? 2/ I really don't want another big gauge wire running down my car, so why exactly do I actually need to ground back to the primary battery instead of a good place in the back...prob where the factory amp is grounded to? 3/ If I chose to upgrade my battery with one of these fancy $250 batteries instead of running a second battery, is it possible to get 60min of playing time out with no issues or worries of starting the car after (considering the setup I have)? Thanks. [/QUOTE]

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