Battery Problem??

[sonyminidiscman]

Hi, maybe you guys can confirm my findings or suggest new things.

over night, my battery seem to have just died, i tried to start it yesterday morning, i hear a click and nothing else, so i use an external battery, jump started with no problem... same thing after work....

So I took a voltmeter, did some testing:

Car Idle, battery is 12.96V
Car just turned off, 12.96V after 20 min, 12.80V
Disconnected -ve terminal, left over night, in the morning, 12.30V

When i tried to start it this morning, its sounded like theres not enough battery, so does that mean my battery just died over night? or can it be something else.

[Flashmn]

First of all, you should be having 13-14.4V coming out of your alternator. Second, sounds more like you have a short, or something thats causing the battery to drain... Although a battery can break over night even. So dont count that out either, you can get the battery tested.

[sonyminidiscman]

Oh man, i spend about 5 hrs today.......... trying to find that short, i know it exists.... but i can't find it............ i took out all the fuse that I don't think i need, like dome lights and cigareet lighter, radio,

and i see it still draining like 0.01V every minute.................. what else can i do???

[daniel2002p]

do this.... test the amp load on the battery when the car is off and all the accesories are turned off... just like u leave it overnight.... there should be no more than a 2mA load on it... if u get that load then its your battery... also what u can do, before u park ur car for the night, take the battery completely out, and put it back in the morning, and if the car still dont start u know its the battery that is bad

D

[sonyminidiscman]

Oh thats right......stupid me............ i didn't even think of checking the current....... looked at the stupid voltage for 5 hrs..............thanks!