can someone explain

[20whiteboy03]

how do you hook up a second battery for just your amp? and keep it charged

[TBSpyder]

Either run it directly to the alternator or bridge it to the your current battery.

[Bumpin Expo]

Oo0o0o yes I saw this on Trucks! Tv yesterday !!


Wire the posative to posative and negative to negative then wire to the alternator. That will keep everything 12 volts. DO NOT wire negative on one battery to posative on the other then to the alternator cuz that will cause a 24 volt load and it will blow everything on ur car that is made for 12 volt only. but yeah its not hard at all, hard to understand? ill draw a picture if u need

[TBSpyder]

You'd have to be a moron to wire positive to negative...

[Kirk]

Don't think anyone is that dumb.......
I just picked up one of those bad ass stinger batteries to run as a 2nd... just have to find time to mount it. It was the only thing small enough for me to work with... and god damn more expensive than an optima :( got to pay to play i guess

[TBSpyder]

Originally posted by SupraKid
Don't think anyone is that dumb.......
I just picked up one of those bad ass stinger batteries to run as a 2nd... just have to find time to mount it. It was the only thing small enough for me to work with... and god damn more expensive than an optima :( got to pay to play i guess

Why do you need a second battery?

[93ex]

To keep it charged, use a battery isolator or a diode, even tho a diode loses .5 volts or so.

dont wire battery to battery, that will just drain both.

[SSpiro]

Originally posted by 93ex
To keep it charged, use a battery isolator or a diode, even tho a diode loses .5 volts or so.

dont wire battery to battery, that will just drain both.

Word! Beat me to it.

I'm also curious why the need for a second battery.. Even some of the most advanced or power-hungry setups can be done on a single battery. Possible that you may just need a larger alternator?

[20whiteboy03]

i have a optima gel cell my dad gave to me and thought it would be cheaper to just hook it up instead of boosting the alt.

[Kirk]

Originally posted by TBSpyder
Why do you need a second battery? Going with a more powerful setup............. :?

[TBSpyder]

Originally posted by SSpiro
Even some of the most advanced or power-hungry setups can be done on a single battery. Possible that you may just need a larger alternator?

+1. Advantages of an additional battery are minimal on most everyday systems.

[TheTotaledMustang]

TTTRRRRUUUSSSTTT MEEEEE.........unless the 2 batteries have the exact same amount of life in them and are installed at the same time, they'll drain each other. If you wired 2 news ones, you'll be alright is they are the EXACT same kind of battery, if anything is different then they will drain each other unless you get a battery isolator (makes alt. stop charging 1 after is done and works on the other one) or a celinoid(check spelling) and that physically separates the 2 battery's connection when the car turns off (unless it malfunctions).

AND ON TOP OF THAT

.....batteries have internal resistance , although very small (say 0.01ohms), when factored into the equation of Resistance= Volts divided by Current......that small ass 0.01 can make the differance of up to 4 or 5 volts sometimes.

I had a 460cc lead acid and a 950cc lead acid battery of my 140amp alternator wired to my 1200+ watt system before w/ a 2.4 farad cap......and my volts were at 11.7idleing and sometimes got as low as 10.5 durring continuous play. (that was the mustang)
Now in my Maxima i have one reblimished 650cc deep cycle (23 bucks at interstate battery) of my 120amp? 115? (not sure, but it's smaller) and i hold 14.9 idleing and 14.0 solid while bass is dropping pulling 1500watts rms. NO CAPACITOR

IMO from experience and reading about it car stereo magazine, unless you're going all out 3000+ watts rms i dont think you need an extra battery, if you're concerned get a nice optima or stinger and it'll do fine. my 23 dollar reblimmy is still pounding after 10 months of abuse......

[Bumpin Expo]

^ yeah what he said!

[Mmmm Rice]

i put 2nd battery's in cars at work like every day and you dont need an issolater and if you uesd a dioed it would need to be a big one you can use a big realy like a 100 -200 amp realy but you dont need that. and i find it is best to use a deepcycel battery, the stinger is good but we have 5 in one of the vans we put a system in and they dont like to stay at 12 volts nop matter how much you charge them. a adding a battery wont drain your old one just dont play your system with the car off. any system with more than 100 amps of curent draw needs an extra battery,

[Kirk]

I had no choice but to go with a stinger since they are so small... I don't have much room to work with and I am not exposing the battery... so I am limited.

[TheTotaledMustang]

ya if you go over 100 amps draw you need electrical upgrades like a new alternator (best but most exspensive), next best is a really good battery, but if you're cheap like me get a nice size dep cycle and slap on a capacitor......