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  #1  
Old March 19th, 2014, 08:53 PM
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Chris Davis
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Battery drain issue

My 90 seems to be loosing charge. What is strange is that I don't see too much coming out of the battery when the car is off---I am reading a total of .026A, of which .017 A is my sub woofer which I have temporarily unplugged. So .009A seems pretty darn typical/reasonable for the accessories like the clock, stereo and ECU in the off position. When the car is running, the battery charges fine and the battery gets to over 13V DC but then when it sits, just a matter of days, the battery drains to under 12V. My battery is rather new, less than a year, and it is the Odyssey 2150, an absolute beast of a battery.

I am thinking I may need to get the battery checked out---that said, doesn't .026A draw seem too low to drain the battery over a 3 or 4 day period?
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  #2  
Old March 19th, 2014, 09:00 PM
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Bill Adams
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With the engine running and the alternator charging, you should be seeing 14.4 at the battery. If it's only at 13-sumthin, I'd wonder if I had a bad cell.
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  #3  
Old March 19th, 2014, 09:04 PM
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If the nominal battery voltage is 12V then there's nothing wrong with the voltage being slightly under 12V.

Are you having problems starting?

26mA at 90Ah capacity should last 144 days.
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  #4  
Old March 19th, 2014, 09:08 PM
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Mark Garrenton
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You're measuring that draw between ground and battery post (lifted lead) I'm assuming. That is not an unreasonable draw. The other issue could be a bad diode in the alternator since you mention charging voltage only over 13v when it should be close to 14.5v. It can drain the battery easily. I had a similar issue in my suburban until I swapped out the alternator. You might consider swapping in another good battery (any would do) to see if it repeats the problem too. Having that high dollar battery checked, if you purchased it local, couldn't hurt.
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  #5  
Old March 19th, 2014, 09:15 PM
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The first thing to do would be to check your battery, as others have already stated. I've seen batteries do some strange things over the years, and no brand battery is perfect.
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  #6  
Old March 19th, 2014, 09:17 PM
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Chris Davis
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Sorry--I meant that the battery, when fully charged, reads about 13.3V. The battery, with the truck running in idle, reads 14.4V.
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  #7  
Old March 19th, 2014, 10:03 PM
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Battery

Sounds like the charging circuit is ok. Do a load test on the battery. That's a great quality battery but may have an internal short......that could lead to a fire.
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  #8  
Old March 19th, 2014, 10:27 PM
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Chris Davis
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Yeah, I am stumped. I will take it in for a test--just pulled the receipt, bought it in 6/13 so it is still pretty fresh...
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  #9  
Old March 20th, 2014, 06:48 AM
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Are you having problems starting?
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  #10  
Old March 20th, 2014, 07:48 AM
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Quote:
Originally Posted by Davis View Post
I am reading a total of .026A, of which .017 A is my sub woofer which I have temporarily unplugged.
I have a theory based on experience dealing with my sons 1993 Range Rover.
The RR has an Isuzu 4JB1T with a 200amp alternator.
He has the back of the vehicle packed with a speaker box complete with sub woofers.
There is also a big amplifier.

He has gone through 3 batteries being so damn cool blasting ear drums and so on.
I drive the RR to keep it in occasional use and noticed when the amp and speakers are blasting at idle, the battery voltage drops down even with the 200amp alternator.
This constant drop and quick recharge when you come off idle damages the battery to a point that it no longer holds a full charge.

Batteries aren't designed to be quickly drained and quickly recharged.
They are designed to be slowly drained and slowly recharged.

This weekend when it was warm, I decided to go for a drive in the RR and sure enough the battery was under 8 volts after sitting for a week and it needed a jump to start. Driving it was fine and it would immediately restart.
Sat overnight and the battery was drained again.

From the limited research I did, the problem is common.
The solution is to isolate the car battery from a special audio battery with a split charger.
The audio battery is hooked up to the stereo equipment and the car battery is hooked up to everything else.
That way, the stereo can't ruin the car battery and the vehicle will start when you need it too, provided you don't have a diode drain as Mark suggests...
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  #11  
Old March 20th, 2014, 08:35 PM
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Chris Davis
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Although in your situation that may be all true, but my amps and sub are not that big and we are talking a huge battery with the 2150 that is designed for rough service and draining. I currently have in my 8 year old PC2150 and it is working just fine--I have had the same stereo/sub for it's entire 8 years of use (why I changed it to a new one was user error--it turned out to be the starter but I figured 8 years in I might as well change it anyways). This battery is only 8 months old and it only gets moderate stereo use.

It is at Battery Systems getting checked out. The initial check had it's cranking amps at a paltry 400A so they are charging it over night and we will make a determination in the morning. Another reason I went with the 2150 is odysseys' warranty---4 year full replacement... not bad at all.

I'll know more tomorrow, but right now I have no clue what may have gone wrong. The battery may just have been a bad battery. Or maybe the alternator is bleeding AC current and damaged it (I used my DMM to check it and I am getting very little AC so I doubt it although i will end up taking it to a shop to get a good reading, or borrow an oscilloscope). It sure seems though that it is the battery...
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  #12  
Old March 20th, 2014, 10:50 PM
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Robert Lynch
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I killed my 2150, solution after tracing the drain was a stuck turn signal relay.
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  #13  
Old March 21st, 2014, 07:55 PM
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Chris Davis
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This was a dead battery--no clue why, but they replaced it no questions asked (after they tested it). One more reason why I like this battery and Odyssey--4 year warranty on full replacement---that is standing behind a product...
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  #14  
Old March 21st, 2014, 08:03 PM
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Adam Setliff
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Just curious as to how much this vehicle gets driven? Daily, weekly, how long of a drive?
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  #15  
Old March 21st, 2014, 08:09 PM
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Chris Davis
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It varies. Sometimes I take it on my commute to denver (about 30 miles each way)--about twice a month. I (or my wife) drive it around town, about 10 miles, about 2 or 3 times a week. When it originally went "flat", it was sitting for a couple weeks in extreme cold, but this has happened before on the last battery about 2 dozen times without going down.

They tested it and they said it is completely shot. I am going to have a shop run a diagnosis on my alternator just to make sure there isn't leaking AC current--I am fairly certain it is normal based on my MM tests, but I don't mind just making sure. Truck sat two days on the last (old, 8 yr) battery and the .025A drain didn't make a dent--so it isn't my electronics...
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  #16  
Old March 22nd, 2014, 07:49 AM
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It would be a bad idea to put a cheap battery maintainer on it if you let it sit.
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