2 car batteries?

I'm a little confused, but worried at the same time. My friend has 1 12" Kicker L7 in his Blazer, and supposedly it sucked all the juice from his battery. So, he got a 2nd battery put into his car. I'm curious as to if this is necessary if you have alot of power? Say 2 12" CVX's pushing 1500 rms @ 1 ohm? I don't want to risk buying something and then finding out that it just sucks all of my battery...

The Alternator charges the battery. If you don't generate enough power the battery will not get charged and fail. Adding a second battery just made the problem worse. Now the Alt has to work that much harder to charge two batteries. Chances are that Alt will smoke soon. Not sure how long the batts will last. A HO Alternator is where the money needs to go.

Battery type? He should only need 1 battery for one 12.This is what I do for FUN!

I would add a second car battery only if you are planning to upgrade your alternator.  If you do upgrade, batteries should be identical also close to the same purchase date if possible.  I had bad experiences with optima yellow top car audio batteries, i would go with something else, just my opinion.

"Battery type? He should only need 1 battery for one 12." The type of battery makes no difference. Yes the AGM might charge faster but energy is not being created. So an 18" needs two batteries? If your amp is wired to 4 ohms the amp doesn't care how many speakers are connected. The Amp(s) wattage and efficiency determins the number of batteries not the number or size of driver. Optima isn't my first choice.

I like the XS power battery's better then the Optima but that's just me.Can't be loud then don't have it.

(power acoustik system)

Head unit- TID-896 7" TOUCHSCREEN

ovn1-5500d 09 and another one coming soon

4-12" mofos 12ft3 box to 40hz (wall)

2 batterys, 1 power

I think it sucked all of his juice while the car wasn't running. But, I think I may stick with CVR's. Those shouldn't need anything special. Maybe go with Alpine Type-R's. Suggestions on that one?

audiocableguy wrote: "Battery type? He should only need 1 battery for one 12." The type of battery makes no difference. Yes the AGM might charge faster but energy is not being created. So an 18" needs two batteries? If your amp is wired to 4 ohms the amp doesn't care how many speakers are connected. The Amp(s) wattage and efficiency determines the number of batteries not the number or size of driver. Optima isn't my first choice.

Kind I should say? If optima's isnt your first choice, then type/kind matters to you, no? Stock Nissan battery drains in 2 songs with 1 12", discretion with yellow top hasnt died yet. I would think that the energy needed pushing 2 15's would be greater then the energy required by 10's. So, 12 boat speakers all flexin for 1 hr uses the same battery power as 4 speakers in 1 hr as long as ohm's are the same? This is what I do for FUN!

You can run 1000000 speakers on the right amp with 1 battery.   The number and size of the speaker has nothing to do with the amount of batteries, the size and efficency of the amp do. 2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

"Stock Nissan battery drains in 2 songs with 1 12", discretion with yellow top hasnt died yet." If your loosing battery in less than 5 minutes you have a bad battery and or faulty charging system. Just because the Optima has more run time doesn't mean it's a better battery, just means it has more capacity or maybe just newer. "12 boat speakers all flexin for 1 hr uses the same battery power as 4 speakers in 1 hr as long as ohm's are the same? " Yes. "I would think that the energy needed pushing 2 15's would be greater then the energy required by 10's." Pretty basic stuff, electronics 101. It concerns me you are posting advise not knowing this stuff.