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<blockquote data-quote="HardofWhoring" data-source="post: 8866713" data-attributes="member: 674149">An AGM would have a better discharge rate, and since you can mount them in other directions, they help with install, you just don&#039;t need that.&nbsp;&nbsp; A good stock battery should be fine, especially considering an upgraded alt is going to produce more amperage to help with that draw.If you&#039;re really up for it, here&#039;s what you can do:Install the system you have and don&#039;t buy a batt or alt.Set it up, play it, and see when you start to have trouble.&nbsp;&nbsp; If you can max it out on your stock electrical, then you 100% don&#039;t need a battery.&nbsp;&nbsp; Dimming lights is going to be a sign that your draw is higher than you can handle. Your battery voltage dropping means your alternator can&#039;t keep up.Set it up, drive it around, and start with about half volume on the stereo.&nbsp;&nbsp; Play 3-4 heavy songs, (about 15-20 minutes).&nbsp;&nbsp; Then turn your volume up by one number, and start again.&nbsp; Keep going until you notice your electrical can&#039;t keep up.&nbsp; (If you wanted to really test your draw, turning your AC on, will work it a little harder if you do that in the summer).Then you can use this to see how, and test your AC voltage. [MEDIA=youtube]gg2gl-fz2Qc[/MEDIA]That will tell what your wattage is, and you can then tell what your amperage draw is when you start to notice problems.&nbsp;&nbsp; You can then compare it to where you will end up when you max it out.&nbsp; &nbsp; Your alternator will need to be a little more than that difference.&nbsp;&nbsp; Your alternator will add that amperage to the draw.</blockquote>

[QUOTE="HardofWhoring, post: 8866713, member: 674149"] An AGM would have a better discharge rate, and since you can mount them in other directions, they help with install, you just don't need that. A good stock battery should be fine, especially considering an upgraded alt is going to produce more amperage to help with that draw. If you're really up for it, here's what you can do: Install the system you have and don't buy a batt or alt. Set it up, play it, and see when you start to have trouble. If you can max it out on your stock electrical, then you 100% don't need a battery. Dimming lights is going to be a sign that your draw is higher than you can handle. Your battery voltage dropping means your alternator can't keep up. Set it up, drive it around, and start with about half volume on the stereo. Play 3-4 heavy songs, (about 15-20 minutes). Then turn your volume up by one number, and start again. Keep going until you notice your electrical can't keep up. (If you wanted to really test your draw, turning your AC on, will work it a little harder if you do that in the summer). Then you can use this to see how, and test your AC voltage. [MEDIA=youtube]gg2gl-fz2Qc[/MEDIA] That will tell what your wattage is, and you can then tell what your amperage draw is when you start to notice problems. You can then compare it to where you will end up when you max it out. Your alternator will need to be a little more than that difference. Your alternator will add that amperage to the draw. [/QUOTE]

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