Can you hook a sub and speakers up to a 2nd car battery?

[gumbob3]

Background on the Situation (Vehicle is 2008 Chevy Colorado):
1) I do not want to buy new car subs
2) I do not want to mess with wiring, etc.
3) I want an AUX cable, and all the stock radio has is radio and CD player. No cassette
4) I do not want to drain my battery, or stress/ruin the alternator.
5) I don't want to spend a lot of money (Definitely less than $100)

*Links for items will be posted below*

So, now that that is out of the way, here is my idea! I have a dell subwoofer. It isn't that big, but I like it. It also has a center speaker, and 4 other speakers that plug into the back of it, as well as an aux cable that you can plug into your phone and play music. Would it be a good idea to buy a battery, put it into a marine battery box, hook up an AC outlet to the battery, and just plug the sub into the outlet in order to power it? I measured how many amps the sub was taking while in use. It was always between 16 and 30 amps while playing sail bass boosted with bass all the way up, and volume fairly high. Depending on how many AH the battery can hold, I could just take the battery out and charge it once a month to once every few months (I would use speakers for 5-8 minutes a day).

Finally, my questions!

1) Is this a good idea?
2) Do you see any problems with my idea?
3) Is there a better solution for same price point, and no wires, etc.?
4) What battery would you recommend for the situation I described ($20 Motorcycle, PowerWheels battery? Or $50 car battery? Or what?)
5) How do you hook a power outlet up to a battery? Just a wire from positive to positive, and a wire from negative to negative? That easy?

Links:
Battery Box: https/www.walmart.com/ip/Attwood-Power-Guard-27-Battery-Box/16351062

AC Power Outlet: http/www.tormach.com/store/index.php?app=ecom&ns=prodshow&ref=30177

All help is very much appreciated! Thanks!!

 

[Math Geek]

you're problem is going to be converting the voltage to the right kind. a car battery is 12v DC while a standard house outlet it 110v AC

usually this is done through an alternator to create the right kind of power. you could instead buy one of those ac/dc convertors for cars and use the outlet provided on that one. you'd need to figure out how much power you'll need but something like this is what i am thinking of. http/www.newegg.com/Product/Product.aspx?Item=9SIA7RA2NM9491&cm_re=dc%2fac_invertor-_-9SIA7RA2NM9491-_-Product

may need more power depends on the watts you need for the woofer. this will run right off your current battery and mean you won't have to bother with a second battery. spend the cash instead on a high wattage one of these and then enjoy your speaker set. you can connect it to any 12v port or run a wireto it from the battery or fuse box if you wish to power it that way.

 

[jsmithepa]

Anything having to do with car is not easy, you really have to want to do it, and by all those requirement, me say you don't want it enough.