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Old 11-20-2014, 11:17 AM   #7939
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So everyone should turn off their batteries manually tonight. I.e.- turn off the switch
Everything was off last night. Amp was unplugged. Temps around 20 degrees F. It's 30 degrees F right now. Car turned over slightly and then went dead.

I cannot/will not live with this. As I understand it, my options are:

1: Go back to stock until spring;
2: Run a larger starter battery in the trunk;
3: Somehow figure out how to squeeze a larger starter battery under the hood.

Has anyone managed to squeeze a larger starter battery under the hood in the same location (but with a different battery base/box)?

What battery in between the size of the current one and the OEM battery should I be looking at?

Thanks.
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Old 11-20-2014, 11:38 AM   #7940
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Everything was off last night. Amp was unplugged. Temps around 20 degrees F. It's 30 degrees F right now. Car turned over slightly and then went dead.

I cannot/will not live with this. As I understand it, my options are:

1: Go back to stock until spring;
2: Run a larger starter battery in the trunk;
3: Somehow figure out how to squeeze a larger starter battery under the hood.

Has anyone managed to squeeze a larger starter battery under the hood in the same location (but with a different battery base/box)?

What battery in between the size of the current one and the OEM battery should I be looking at?

Thanks.
I ordered an odyssey pc925, I will have it tomorrow. I'll let you know how that works out.
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Old 11-20-2014, 11:54 AM   #7941
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I ordered an odyssey pc925, I will have it tomorrow. I'll let you know how that works out.
Where are you planning to install it? And that looks like it's as big or bigger than the OEM... is it?
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Old 11-20-2014, 12:13 PM   #7942
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If it really does come down to the battery you can always disconnect your 1.5 conversion and run a bigger starter battery.
Fenton, which larger battery did you use? Do you think there would be room to keep it under the hood with the 1.5 conversion hooked up (with modification of the battery tray, of course)?
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Old 11-20-2014, 12:17 PM   #7943
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One more question... I still have the OEM battery. If I wanted to install it in the trunk, what gauge wire should I use for that? Would the long run require a larger gauge?
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Old 11-20-2014, 12:19 PM   #7944
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My car hasn't been started since Saturday. Monday, Tuesday and Wednesday evenings it went down to 17F. This morning it was 23F. I had no problem starting this morning. All accessories were turned off Saturday when I shut down the car. The little starter battery isn't the trouble, or at least isn't the sole source of trouble. Check your charging voltage to make sure you're getting 13.5-13.7VDC at the battery.
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Old 11-20-2014, 12:21 PM   #7945
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My car hasn't been started since Saturday. Monday, Tuesday and Wednesday evenings it went down to 17F. This morning it was 23F. I had no problem starting this morning. All accessories were turned off Saturday when I shut down the car. The little starter battery isn't the trouble, or at least isn't the sole source of trouble. Check your charging voltage to make sure you're getting 13.5-13.7VDC at the battery.
Just leave it hooked up and touch the two ends of a voltmeter to the battery terminals?
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Old 11-20-2014, 12:25 PM   #7946
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Just leave it hooked up and touch the two ends of a voltmeter to the battery terminals?
Yes, this should give you a pretty good idea. I bought one a while back when I thought I was having battery issues (I wasn't), Pep Boys, around $12 I think.
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Old 11-20-2014, 12:28 PM   #7947
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I did some documentation between last night and this morning.

The starter measures 14.20-14.26v with the engine running. After I shut off the engine, it read 11.95v with the headlights still on. 12.86v with the headlights off as well. Seems normal. The battery is being charged properly, I think.

I turned off my car at 6:40pm.

0640pm 13.08v 23F
0740pm 13.01v 23F
0840pm 12.98v 25F
1040pm 12.80v 28F
1140pm 12.86v 30F
1240am 12.87v 30F
0440am 12.67v 27F
0840am 12.68v 27F

14 hours later, I tried to turn on my engine. To my surprise, it actually turned on. But it was also (slightly) warmer than the days where it didn't turn on. It cranked 5 times and then turned on. Starter battery reads 14.50-14.58v again.

I drove 10 minutes (3 miles) to the gas station. Turned it off, and then tried turning it on again. Cranked 4 times and then started. I turned in off, filled up on gas, and measured the battery again: 12.60v. After I filled up, I turned on the car, it did 4 (very, very weak) cranks, and then started (but barely). Hmm, probably shouldn't have started the engine an extra time when I pulled into the gas station on such a weak battery.

Drove 20 minutes (11 miles) to work. Starter readers 12.89v after I turned off the car. Turned on the engine again: 4 cranks and then engine started. Turned off car and measured again after a minute, seems to be steady around 12.81v (might've climbed a little bit more afterwards).

I know voltage doesn't tell the full story of the condition of a battery, but any insights here? Had it been any colder, do you think the voltage would've dropped to an unstable level?

If my car doesn't start in the morning again, I will measure the voltage after each failed crank attempt.


Edit: This is with headlights off, HVAC off, and audio off.
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Old 11-20-2014, 12:29 PM   #7948
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You may not need a physically larger battery, your CCA might be a little low and you may just need a battery that can output the demanded CCA.
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Old 11-20-2014, 12:41 PM   #7949
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0640pm 13.08v 23F
0740pm 13.01v 23F
0840pm 12.98v 25F
1040pm 12.80v 28F
1140pm 12.86v 30F
1240am 12.87v 30F
0440am 12.67v 27F
0840am 12.68v 27F
Your charging voltage looks perfect, but your battery's ability to hold a charge is a problem. You either have a power drain or a bad battery. The static voltage should be 12.8-12.9 VDC. It should hold this condition for many days.

You can investigate a drain condition by simply pulling fuses while in an off condition. If you get an increase in battery voltage while pulling fuses you've found the offending circuit. But more then likely you have a bad battery. You can check the battery by charging during a drive and then immediately disconnecting the negative terminal upon shut down. You should see 12.8-9VDC and it should hold something close to that for many hours, if not days. If you see the same discharge schedule as you posted above, the battery is bad.
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Old 11-20-2014, 12:47 PM   #7950
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You may not need a physically larger battery, your CCA might be a little low and you may just need a battery that can output the demanded CCA.
The battery used for starting is right on the ragged edge of being adequate. It doesn't take much to put it on the wrong side of a start/no-start equation. I've had mine over a year now and Fenton has seen about 6 months more then me. I've gone as long as a month in 40 degree weather and was able to get a start. Six weeks later was a no-go.
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Old 11-20-2014, 12:47 PM   #7951
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Quote:
Originally Posted by Gary in NJ View Post
Your charging voltage looks perfect, but your battery's ability to hold a charge is a problem. You either have a power drain or a bad battery. The static voltage should be 12.8-12.9 VDC. It should hold this condition for many days.

You can investigate a drain condition by simply pulling fuses while in an off condition. If you get an increase in battery voltage while pulling fuses you've found the offending circuit. But more then likely you have a bad battery. You can check the battery by charging during a drive and then immediately disconnecting the negative terminal upon shut down. You should see 12.8-9VDC and it should hold something close to that for many hours, if not days. If you see the same discharge schedule as you posted above, the battery is bad.
Thanks, Gary. I'll give it a try today or something this weekend. Hopefully, it's just a bad battery and warranty will be easy to claim.

Edit: Well, seems like the warranty period is only 6 months for mobile applications, and I'm right at the 7-month mark.
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Old 11-20-2014, 01:05 PM   #7952
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I just drove 20 miles to a meeting. When I got out of the car, the battery tested at 12.83. I had turned off everything and unhooked the amp.

I kept the voltmeter on the battery. Within 2 minutes it had dropped to 12.80.

I will check it again after the meeting. Hopefully won't be too low to start.
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