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Old February 19th, 2015, 03:13 AM   #1
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Adding a 2nd Battery

anyone ever done it usually because of a Large Hi power Speaker System?


got most of the recommended, Capacitor for my current lonely 10" inch Sub (had 2 12's in the trunk but removed a while ago) still got another 12" in a ported box but the 10" inside the Cabin behind the Driver's seat provides enough Bass plus added free back massage

What to do to give your car's electrical system a power-up
Upgrading a car's electrical system: do you need the big 3?


upgraded Wiring and made an Engine Ground Kit long time ago but don't see myself needing to upgrade Alternator since 1 10 inch Sub and Amp doesn't require it


basically adding the 2nd Battery to the Trunk for any additional Electrical Mods


picked up Battery and will update with pics
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Old February 19th, 2015, 11:30 AM   #2
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pointless.
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Old February 19th, 2015, 10:04 PM   #3
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^What he said. Hell, the capacitor is pointless as well. Let me guess, its one of those capacitors with an led readout that fluctuates every time the bass hits? Those are soooooo cool. :sarcasm:
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Old February 19th, 2015, 11:08 PM   #4
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Stop hating z, u know u wanna put lambo doors on your accord. Lol
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Old February 19th, 2015, 11:33 PM   #5
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Getting a better primary battery and upgrading the wire running to your amp will be a better use of funds. A regular single battery only lasts 20 minutes or so with a system running and headlights on, your alt does the rest of the work. Get an agm battery :-)
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Old February 20th, 2015, 02:39 AM   #6
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Getting a better primary battery and upgrading the wire running to your amp will be a better use of funds. A regular single battery only lasts 20 minutes or so with a system running and headlights on, your alt does the rest of the work. Get an agm battery :-)
already got the Best Battery made from my Brand

not an Optima or anything but it's been good


got too many Wires running through Engine Firewall and on adding things like USB charger to for Rear passengers. would like to cut up the Center Arm Rest and make it cleaner but not sure how far i wanna go with this 2nd battery

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Old February 20th, 2015, 08:21 AM   #7
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already got the Best Battery made from my Brand

not an Optima or anything but it's been good


got too many Wires running through Engine Firewall and on adding things like USB charger to for Rear passengers. would like to cut up the Center Arm Rest and make it cleaner but not sure how far i wanna go with this 2nd battery

Oh jeus ****ing fire hazard, call your local department and see if that makes it up to code.

Get a 0 or 4 gauge run of about 16-20 foot, and connectors. Get some 8 gauge wire and some connectors. Get a distribution block And some larger full size vice grips. Get a blowtorch. Put the 0 or 4 gauge down to a distributor block down wherever it's remotely close to your equipment and mount with screws/industrial velcro(home depot). Then go from your distributor block up to your capacitor, then to your amp, and possibly up to the stereo i'm guessing you're using that's not stock. Run a 0 or 4 gauge wire from your alternator direct across to your battery positive terminal. Run a 0 gauge or 4 gauge (in addition to stock ground) from your battery negative to a freshly ground down spot on the frame. (same with the ground for your amp and capactitor). Then buy a 100 pack of zip ties and go to work getting those wires in order and out of the way.

Then sell your current battery on CL and get an AGM battery (I have a spare since i'm upgrading that fits our current battery slot)


you will be much happier at how boss this all looks afterwards despite spending a few bucks on wire that you "already have" And if you use 0gauge for all this it should bulletproof the system to up to around a 1500wrms 2000wrms system, which is about when your alt will start having issues keeping up.

What do you define as best? brand and CCA? AGM?

www.knukoncepts.com is a great site for wiring and connectors that. I love their wire and their connectors, and their distribution blocks, and it's all budget equipment as far as price but not quality. Plus it looks ****ing cool.

If you're dead set on a second battery, pick up motorcycle or moped battery. they're usually about 1/4 the size, maybe 10Ah batterys with 200-300CCA additional to your stock battery, and are near the $50 mark. By comparison I think that's the equivalent of having 50 or 100 of those capacitors back there.

Else I do sell supercapacitor banks that are either 58,350, or 3000 farads.
And a spare 3000w (1000rms) 12" as well as matching amp if you felt like having trouble breathing when bumping it lol.
Happy hunting.
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Old February 20th, 2015, 10:21 AM   #8
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Stop hating z, u know u wanna put lambo doors on your accord. Lol
Got me.
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Old February 24th, 2015, 03:31 AM   #9
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Oh jeus ****ing fire hazard, call your local department and see if that makes it up to code.

If you're dead set on a second battery.
i've always ran Wires through the Engine Firewall and have EVERY single modification on a fuse with Fuse Holder so should kill power if there's a power surge or any other probs.


yeah, i wanna put together a standard Battery for a couple reasons:

1. if i removed Spare Tire, a standard battery in the back where the Spare was will add more weight than a smaller Battery during winter months

2. if Engine Battery were to fail, heck they'll always be a spare in the back

3. peace of mind, like i said, there's enough going through the Engine Firewall and already ordered have the 2nd Battery plus ordered the Battery Box and Terminals today!


thanks for the helpful info, i may keep this in mind

i think it should be fun
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Old February 28th, 2015, 05:03 AM   #10
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Battery Box arrived!, went w/Marine Attwood Battery Box: (sry about camera pics but its been single digits here so quickest way to take pics)






Battery, Battery Terminals, Battery Box...right side of trunk:




with Strap on and secure. i covered the 2 holes w/electrical tape since sometimes when i open my trunk, specks of rain or snow get in. will most likely relocate too farther up in trunk area later:

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Old March 1st, 2015, 07:31 PM   #11
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1, good choice on the sealed box, I haven't even thought of one for when the trunk drips in.
2, I really hope that wire on the left isn't what's going to your battery... that'll start a fire. That size isn't even rated to power a pair of headlights.
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Old March 2nd, 2015, 01:02 AM   #12
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1, good choice on the sealed box, I haven't even thought of one for when the trunk drips in.
2, I really hope that wire on the left isn't what's going to your battery... that'll start a fire. That size isn't even rated to power a pair of headlights.
1. thanks, yeah, i noticed esp. w/snow, no matter how clean i brush it after a storm, some specks will fly into the trunk

2. definitely not, its for a aftermarket Gauge
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Old March 2nd, 2015, 01:14 AM   #13
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Does that guage really need that much power? If not I would just wire it directly into the main battery as the battery you have sjust set up has not been connected to the main an will never charge(I assume) if you Want a quick fix for this I have a 100 amp relay sitting aroung that may benefet you being able to choose when the charging cycle is on or off.

Would recommend a voltage monitor though, just make sure it doesn't dip below 10.
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Old March 4th, 2015, 01:44 AM   #14
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Does that guage really need that much power? If not I would just wire it directly into the main battery as the battery you have sjust set up has not been connected to the main an will never charge(I assume) if you Want a quick fix for this I have a 100 amp relay sitting aroung that may benefet you being able to choose when the charging cycle is on or off.

Would recommend a voltage monitor though, just make sure it doesn't dip below 10.
its just the 1st part on it

yeah, already order something to monitor Voltage on it
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Old March 4th, 2015, 04:42 PM   #15
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1. thanks, yeah, i noticed esp. w/snow, no matter how clean i brush it after a storm, some specks will fly into the trunk

2. definitely not, its for a aftermarket Gauge
Why are you worried about a few drips of water getting onto your battery, when your "normal" battery is exposed to splashing water in the engine compartment up front? And I know the batteries in Fieros are essentially directly expose to the rain under the rear engine compartment vents.

Personally, I'd be more concerned about the accumulation of hydrogen gas in the sealed battery box. See this site ( cisco-inc.com/battery/hydrocon/ ) for an explanation of the safe levels of hydrogen in a given size "room." So sealing it into the small battery box makes it very easy to reach explosive concentrations of hydrogen. Whereas if you let it vent into the trunk, you have a MUCH larger volume, and it is somewhat ventilated through the cabin exhaust under the bumper. Just be safe!
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Old March 5th, 2015, 08:11 PM   #16
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Why are you worried about a few drips of water getting onto your battery, when your "normal" battery is exposed to splashing water in the engine compartment up front? And I know the batteries in Fieros are essentially directly expose to the rain under the rear engine compartment vents.

Personally, I'd be more concerned about the accumulation of hydrogen gas in the sealed battery box. See this site ( cisco-inc.com/battery/hydrocon/ ) for an explanation of the safe levels of hydrogen in a given size "room." So sealing it into the small battery box makes it very easy to reach explosive concentrations of hydrogen. Whereas if you let it vent into the trunk, you have a MUCH larger volume, and it is somewhat ventilated through the cabin exhaust under the bumper. Just be safe!
sealed battery boxes often aren't sealed for this very reason. However most batteries will vent so little hydrogen under normal use that this need not be a concern. There should also be no reason for a spark on a battery inside a sealed box.

I'm not sure if you've ever opened the trunk of an accord after it's rained, but it leaks. Hard. directly over where he has the battery located on the mirrored side.

Also your normal battery should never get splashes of water on it. If you can manage to get water up, through, around and above the engine, without flooding, you deserve a reward.

edit: just noticed you covered the vent holes. I wouldn't do that. and would have that gauge on a relay.
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Old March 14th, 2015, 08:56 PM   #17
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thanks for the info

i think i'll find a way to make small vents/slits on the side


agreed about trunk and water n if you live where there's 4 true seasons, almost impossible to not let in at least 1 snow flake during winter
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Old March 14th, 2015, 09:08 PM   #18
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so why not agm battery?

looks good though. at least you got a box and everything
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Old March 15th, 2015, 08:50 AM   #19
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so why not agm battery?

looks good though. at least you got a box and everything
thanks!

i think going w/a standard first time was best, see if i really need it, want it in the trunk, etc.

did a quick search on AGM Battery and maybe next time
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