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Old 06-22-2019, 05:50 PM
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Bad battery????

I just got a Odyssey 34r- pc1500 extreme battery.
I hooked it up to my agm battery charger right out if the box thinking it may be Little low from sitting who knows how long. The charger showed it was about 1/2 dead and took over 4 hours to fully charge.
Today I put it in my 2012 jku and hooked everything back up. Royal pia. When I started the Jeep it took several turns of the starter to turn over the Jeep the old battery did it almost immediately. The second the Jeep started I got check engine light. I checked the codes and was several voltage issues 2 of them where with the fan relay. I tried clearing them several times but wouldn't go away. I checked fuses and relay thinking I could have blown fuses change out the battery but all where good.
I then put the old battery back in and started the Jeep up and all the trouble codes went away. I cleared the stored codes and they didn't come back on.

I am thinking the Odyssey battery is the issue since this was only thing I changed. Sent a message to company I bought the battery from to see what they say about it.

What are your thoughts on this?

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Old 06-22-2019, 06:23 PM   #2
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Negative.

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Old 06-22-2019, 09:29 PM   #3
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Negative.

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No, positive.......
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Old 06-23-2019, 11:55 AM   #4
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It would have been a good idea to actually put a voltmeter on the battery instead of just putting a charger on it. Some cheaper chargers don't do well with AGM batteries even though they say it's ok. (I have one from AutoZone that does the same thing)
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Old 06-23-2019, 12:17 PM   #5
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How certain are you that the ground on the new battery was not loose when you were done? The negative terminal in the Odyssey seems to be a bit smaller than stock and the factory clamp does not play nice with it. It doesnt clamp far enough. It can be deceiving and might cause the behavior you describe if it's too loose. I had to use one of those terminal cap spacer things on mine. Looks like a thimble with a slit in each side, easily gotten from your local auto parts store or amazon. Though it was too big to use the whole thing so I cut it and used a half of it to make sure the terminal is nice and tight. Very common issue. I would look at that before calling a new odyssey defective off the bat without having it load tested.
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Old 06-23-2019, 12:33 PM
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How certain are you that the ground on the new battery was not loose when you were done? The negative terminal in the Odyssey seems to be a bit smaller than stock and the factory clamp does not play nice with it. It doesnt clamp far enough. It can be deceiving and might cause the behavior you describe if it's too loose. I had to use one of those terminal cap spacer things on mine. Looks like a thimble with a slit in each side, easily gotten from your local auto parts store or amazon. Though it was too big to use the whole thing so I cut it and used a half of it to make sure the terminal is nice and tight. Very common issue. I would look at that before calling a new odyssey defective off the bat without having it load tested.
i am 100 % that both battery cables where tight. I had to pry them up to get them off.
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Old 06-23-2019, 01:14 PM   #7
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It would have been a good idea to actually put a voltmeter on the battery instead of just putting a charger on it. Some cheaper chargers don't do well with AGM batteries even though they say it's ok. (I have one from AutoZone that does the same thing)
When using a voltmeter, remember to measure only when the battery is under load (ie, starter motor is turning, or trying to).


Bad battery! BAD battery!!!
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Old 06-24-2019, 07:50 AM   #8
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i am 100 % that both battery cables where tight. I had to pry them up to get them off.
Strange. I suppose I am out of ideas and am stumped then. I don't get why you were getting lights going on if it started the Jeep OK and why they went away when you switched back to the old battery unless it truly is some sort of a dud.
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Old 06-24-2019, 09:31 AM   #9
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… when you switched back to the old battery unless it truly is some sort of a dud.

I had a "dud" Diehard battery once. When I brought it back, the guy told me that there is always one or two, in every pallet of batteries they get.
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Old 06-24-2019, 10:39 AM   #10
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Bad battery.
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Old 06-24-2019, 11:44 AM   #11
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I have that battery in my 2013 JKUR and it leaves no doubt the starter will turn. they have a good warranty so whomever you bought it from will make good. If all the wiring checks out, old battery works then you got a bad battery, it can happen.
Learned this long ago...just because it is new, does not mean it cannot be bad to begin with.
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Old 06-24-2019, 12:18 PM   #12
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Don't put the same charger on the next replacement AGM battery......
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Old 06-24-2019, 03:04 PM
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This was a brand new battery charger. Bought for this battery. I had to go out and buy a new battery from AAA. Because my Jeep is a daily driver and it was in the shop right before this and can't go with a bad battery.
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Old 06-24-2019, 04:01 PM   #14
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You can measure the voltage of the battery. That would be a start. Better, you can load test the battery. Many auto parts stores will do this for you for free.
Better to know than guess.
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