another battery Options

[lime97celi]

i have a 97 celica manual 1.8 how do i put another battery in my car for my system

[itssteve]

nah it still stays a 12 volt system, all i did was run a power wire from the front to the back its like hooking up a cap, lol

and i dont think that you can really increse the resistance of a batt, i could be wrong, and it doesnt double the power. i think that you might be missing something...idk mb i am totally wrong

I didn't say you increased the resistance of the battery, but the resistance of the circuit, when you connect stuff in series the resistance of each component is added so the total resistance is equal to

Ar +Br = Total resistance.

but I'm not missing anything, now you said that you only run the the power wire, which means you have a " parallel " connection, a series connection would require you ro run a wire from the negative pole of the battery to the positive of the second battery, that would be a series connection.

that explains why you still have a 12 volts reading.

i understand this and the only reason that i dont have a run of wire going from the neg pole in the back to the front is because i dont have enough1/0ga wire to do another run right now. also the resistance of the circut would be so minimal that you would never even notice it, i dont wanna argue about circuts, all i know is that a batt will hold a lot more power than a cap and is a better choice because they tend to be around the same price. also the stock alt will charge the second batt no prob the only other upgrade i would make is to change the ground wires under the hood as that will help the voltage out, also you dont need a extra batt unless you are going to run more than 1800 watts or take an amp below 1/2ohm


This post has been edited by itssteve: Jan 18, 2008 - 7:16 PM

[stephen_lee]

nah it still stays a 12 volt system, all i did was run a power wire from the front to the back its like hooking up a cap, lol

and i dont think that you can really increse the resistance of a batt, i could be wrong, and it doesnt double the power. i think that you might be missing something...idk mb i am totally wrong

I didn't say you increased the resistance of the battery, but the resistance of the circuit, when you connect stuff in series the resistance of each component is added so the total resistance is equal to

Ar +Br = Total resistance.

but I'm not missing anything, now you said that you only run the the power wire, which means you have a " parallel " connection, a series connection would require you ro run a wire from the negative pole of the battery to the positive of the second battery, that would be a series connection.

that explains why you still have a 12 volts reading.

i understand this and the only reason that i dont have a run of wire going from the neg pole in the back to the front is because i dont have enough1/0ga wire to do another run right now. also the resistance of the circut would be so minimal that you would never even notice it, i dont wanna argue about circuts, all i know is that a batt will hold a lot more power than a cap and is a better choice because they tend to be around the same price. also the stock alt will charge the second batt no prob the only other upgrade i would make is to change the ground wires under the hood as that will help the voltage out, also you dont need a extra batt unless you are going to run more than 1800 watts or take an amp below 1/2ohm

I think we're getting circuit types confused here.

You have the battery up front hooked up like normal. The second battery in the back has a power wire running from its positive post, to the positive post on the front battery. Both batteries are grounded to the nearest chassis point. This is a parallel circuit. In this circuit, voltage stays the same, while amperage is doubled, and resistance is halved(that the alternator sees).

If you had the battery up fronts negative post to chassis/engine ground, and a power wire running from the front batteries positive post to the rear batteries negative post, then a power wire running from the rear batteries positive post to the stock harness' positive/alt connection into the car, this would be a series circuit. In this circuit the voltage doubles, while amperage stays the same. Resistance also doubles. Of course, power availability stays the same as the above circuit, because Power(Watts) = Amps X Volts.

An extra battery would help with voltage drop since it will double current available to the amp, AND increase the amount of time before the battery/batteries will deplete. SO if you're worried about one, or both, of those problems, a second battery will benefit you.

Edit: Corrected grammar issues.

This post has been edited by stephen_lee: Jan 19, 2008 - 1:27 AM