battery seems fine... - Honda CRZ Forum: Honda CR-Z Hybrid Car Forums
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post #1 of 7 (permalink) Old 04-10-2019, 05:47 PM Thread Starter
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Question battery seems fine...

So I've been having this issue starting my 2011 Z. I let it sit this past winter for about a month and I was having problems starting it obviously after letting it sit that long. I got it running again and it started consistently fine until last night. (Luckily I carry around a jumper with me) I know I shouldn't trust the battery gauge on the dash but after jumping it the battery gauge reads only a bar or two from full. I had my battery changed maybe 3-4 years ago? Is it time for a new battery or could it be a fuse?
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post #2 of 7 (permalink) Old 04-10-2019, 06:06 PM
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Under Hood battery has nothing to do with battery gauge on dash. Have the Under Hood battery Load tested or just replace it . They tend to not last a long time for some of us. The Battery Gauge on dash is for the IMA ( integrated Motor Assist Hybrid Battery). Which battery did you have replaced the under hood 12 volt or the IMA? the IMA battery should last the life of the car. Under hood is a wear out item.


IMA battery is several thousand under hood is Less than or more than a hundred or so. Big Difference.
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post #3 of 7 (permalink) Old 04-10-2019, 06:46 PM Thread Starter
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Thanks for clearing up the difference between the IMA and the under the hood. It's probably the under the hood battery that needs to be replaced as you mentioned that the 12v battery doesn't last very long for some of us. My only question is why would it work for a few weeks and then kaput?
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post #4 of 7 (permalink) Old 04-10-2019, 06:51 PM
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Nature of batteries. In a CR-Z we need just enough energy to kick the process off then IMA and big battery takes over.Look at the many other threads about the 12 Volt.
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Thanks for clearing up the difference between the IMA and the under the hood. It's probably the under the hood battery that needs to be replaced as you mentioned that the 12v battery doesn't last very long for some of us. My only question is why would it work for a few weeks and then kaput?
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post #5 of 7 (permalink) Old 04-10-2019, 07:17 PM
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Nature of batteries. In a CR-Z we need just enough energy to kick the process off then IMA and big battery takes over.Look at the many other threads about the 12 Volt.
Like Spdbump said. 12v is used to boot the ima computer. It only needs something like 50 CCA. Just because the car starts doesn't mean the 12v is healthy. Gas cars need more CCA to start so a weak battery will be more obvious in those.
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post #6 of 7 (permalink) Old 04-11-2019, 12:47 PM
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Like Spdbump said. 12v is used to boot the ima computer. It only needs something like 50 CCA. Just because the car starts doesn't mean the 12v is healthy. Gas cars need more CCA to start so a weak battery will be more obvious in those.
mine started fine on a battery that only tested 55CCA, so you're not far off. The only other symptoms I had were that the Radio died in like 30 seconds in Acc. position, and that the lights were dim when the engine wasn't running. I think I had maybe one turn of the key that didn't start the car, which still happens from time to time with a new battery.

The reason the 12v battery doesn't last as long in a hybrid or EV is that an alternator charges at about 110A, but the DC-DC converter only charges at about 30-50A. The old "start up and run the car for 20 min" to charge the battery turns into a 1-2 hour drive to get the same charge.
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post #7 of 7 (permalink) Old 04-11-2019, 01:40 PM
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Also, unlike a standard Gas engine the DC-DC converter is something like $2k-$3k new whereas a new alternator can be had for $100-$200 from an auto parts store. You always want to pray that any electrical or charging system issues are the cause of a faulty battery and not the DC-DC converter. I have heard that the DC-DC converter is somewhat easy to replace though if it fails. That may save some labor $$$ at the dealership.

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