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Why More Batteries Won't Stop Your Lights Dimming...


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Thats not much compared to a single amp that can draw 300+ amps. Now imagine 2 or more of those.

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great post something i have looked at but never got off into the details anyway

great post Boon

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this is not true all of the time thoug. i am 100% certain when i am at full tilt i am way past the limit of my alternator which is only 130 amps. i added 2 extra batteries for a total of 3 and my headlights stopped dimming right away.

Plain old science says you're mistaken ;/

A battery physically cannot make more than like 12.2v - you can get them to float at 13.x by 'training' your batteries but to say that more batteries made a difference is to laugh in the face of both chemistry and physics.

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10.x volts fo' life!

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Plain old science says you're mistaken ;/

A battery physically cannot make more than like 12.2v - you can get them to float at 13.x by 'training' your batteries but to say that more batteries made a difference is to laugh in the face of both chemistry and physics.

what battery sits at 12.2 volts? hell even a stocker will sit close to 13 volts these days
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what battery sits at 12.2 volts? hell even a stocker will sit close to 13 volts these days

The forward voltage of a Lead + Sulphuric Acid reaction is 2.04v :)

A normal battery has 6 'cells' in series giving 12.24v.

If you warm it the voltage increases a little (I think?) but I don't think it's a huge amount...

A standard lead-acid battery should sit at around 2.15v/cell.

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10.x volts fo' life!

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I added a battery for a friend, and his lights stoped dimming... he is pulling 200A... they do get dim when playing at full tilt, but you dont really notice them dimming and getting brighter in spirts when the bass hits.. thats what i dont like

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i agree with the postee.

battery's don't make 14.4volts. because if they did then you would have a 16 volts alternator to keep it charged.

(don't comment if you have a 16 volt alternator and a 16 volt system) ;)

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The forward voltage of a Lead + Sulphuric Acid reaction is 2.04v :)

A normal battery has 6 'cells' in series giving 12.24v.

If you warm it the voltage increases a little (I think?) but I don't think it's a huge amount...

A standard lead-acid battery should sit at around 2.15v/cell.

if i had a battery that sat at only 12.2v, i would be concerned it was damaged.....12.6-12.8 is normal and 13-13.2 is outstanding in my experience.

also, i too have seen people solve headlight dimming by adding batteries, it really depends on how much power you are drawing, of course everyone wont experience the same thing, especially in the car audio world

.....for me though, i have ZERO headlight dim at full power, HID's FTW :)


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So you get your first ~60A (maybe 600w worth of sound) at 14.4v

Then you get your next 500A - 5kw! - at 12.2v

Then you get into serious shit, voltage will drop like crazy, you risk the car stalling out or damage to the battery...

^^ IIRC, if the voltage drops to around 10 or less volts.. kiss your PCM good bye.. and that cost a hunk of change.. and i mean $$ (depending the the vehicle)

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