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Re: battery dead today - 4 out of 6 cells totally dry Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Sat, 5 Jan 2008 16:38:12
In Reply to: battery dead today - 4 out of 6 cells totally dry, aaron, Sat, 5 Jan 2008 14:28:22 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Bill's observation is quite reasonable. And it can be right. You've been seeing the system in the 13 volts range - probably not enough to boil the electrolyte. My guess is a battery problem. It might be the caps are ill-fitting. It might be that there is a crack in the battery case and it leaked out. It might be it came from the factory low. When was the last time you checked this battery's fluid level? If you've been regularly checking it, and suddenly 4 cells are dry I'd guess a leak. If you've never checked it, I'll bet it came from the store low, and finally died.
Either way, I'd get the battery replaced. It's 7 months old, and you should get a near full replacement. Maybe it was defective, maybe it's your charging system. Either way, I wouldn't trust that battery anymore. Next, I'd get a voltmeter, and measure the voltage on the (new) battery, and compare that with the voltage on the EDU. It'll be different - how much depends on the car. I've seen 0.1 to 0.4 volt differences, but that's a small sample of cars. The EDU could be reading low. If you find the voltage on the battery is too high, replace the voltage regulator.
Remember that the voltage on the battery (the voltage from the alternator) is a function of engine speed, electrical load, and how warm the alternator is. At idle with a minimal electrical load, you should see low to mid 13 volts - at high rpm, no more than about 14.3. But that also depends on temperature. A cold alternator produces a higher voltage (up to about 14.3 or so) than a warm one. Why? The VR is designed that way. The assumption is that the alternator and battery live in the same place. A hot battery shouldn't be charged as fast as a cold one - charging causes heat and evaporates electrolyte. So you'll see the voltage higher when the car is cold than warm.
posted by 76.204.14...
, Sat, 5 Jan 2008 16:38:12 <-- Viewing This Message, Sat, 5 Jan 2008 15:02:45
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