New 12 volt battery for my three year old Accord Hybrid? - Page 2 - Drive Accord Honda Forums | radio-pro.ru
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post #16 of 24 Old 11-06-2017, 10:10 AM
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38 months and 56,000 miles. All has been good, forgot that I might have to change my 12v battery eventually. Been better than any other battery I have owned in the hot south florida.

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post #17 of 24 Old 11-06-2017, 10:26 AM
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Originally Posted by dkwilfert View Post
It is a shame Honda will not release technical information on our cars anymore (Helm Service Manuals); makes life very difficult, and in the case of Hybrids, could be dangerous. I would guess the issue with the tester has to do with the use of a DC to DC converter to transfer some of the high voltage battery energy to maintain (charge) the 12v system. A battery "tester" is nothing but a load amperage measurement, and it may be that the DC to DC converter arrangement in our cars would try to compensate for the current drain of the tester and may either damage the converter or somehow impact the high voltage battery. With Honda "secrets" on technology, we can only guess.
Battery Testing procedure for hybrids:


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post #18 of 24 Old 01-07-2018, 03:43 PM
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Keep in mind also that the Manual allows you to "jump" the 12V system with the battery attached to the electronics, but it does not allow for 12V battery charging with the cables connected.

I would assume that the DC/DC converter is diode protected to prevent reverse current flow, so I can't readily understand why there would be an issue, but I assume it has to do with the 12V sense circuit??
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post #19 of 24 Old 01-10-2018, 10:02 AM
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Why are you guys jumping to conclusions and getting new batteries from autozone or whatever without checking???? None of you clearly know what the issue could be on a new generation hybrid. Take to dealer, save headache.


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post #20 of 24 Old 01-10-2018, 10:05 AM
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Why are you guys jumping to conclusions
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post #21 of 24 Old 01-11-2018, 02:52 AM
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Originally Posted by JHZR2 View Post
Keep in mind also that the Manual allows you to "jump" the 12V system with the battery attached to the electronics, but it does not allow for 12V battery charging with the cables connected.

I would assume that the DC/DC converter is diode protected to prevent reverse current flow, so I can't readily understand why there would be an issue, but I assume it has to do with the 12V sense circuit??
Looking at the 2017 HAH Manual, so where does it say you can't charge the 12V battery? I don't see why this is a concern if you've properly connected to the engine mounting bolt.
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post #22 of 24 Old 01-11-2018, 04:47 AM
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Looking at the 2017 HAH Manual, so where does it say you can't charge the 12V battery? I don't see why this is a concern if you've properly connected to the engine mounting bolt.
I can't say in your 2017 manual, but in my 2015 manual, page 528 specifically allows jump starting with the 12V battery connected to the car's electronics. Page 506 specifically disallows bulk 12V battery charging with the car's battery cables connected. For that one, look for the title "Charging the 12-Volt Battery" in the Maintenance Section. For the jumpstarting one, look in your handling the unexpected section.

That of course assumes the 2017 manual is organized the same as the 2015...

The reason is a mystery to me. I have to imagine it has to do with reverse current over the long run damaging the DC/DC converter that is used to charge the 12V battery. Maybe it isnt diode protected? Of course, what makes it doubly confusing is that you can allow a "jumpstart" which would let a substantially larger amount of uncontrolled current, possibly at worse power quality, into the HAH 12V system. Wish we had a real electrical diagram and the basis of why this is the case.
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post #23 of 24 Old 01-11-2018, 09:36 PM
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I'm not sure about the wording in the manual for my '14, but I've used an RV power supply for my car at stereo shows and for periods of extended tuning connected directly to the 12v battery with no issues. I've now got just over 108k miles on my Hybrid, still using the OEM battery, and will have owned it for four years in March. Maybe it's because I use the power supply to maintain the battery as opposed to letting the voltage sag too far to damage the battery.


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post #24 of 24 Old Today, 01:45 PM
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Originally Posted by drowned12 View Post
Battery Testing procedure for hybrids:
Im not seeing any procedure specific procedure pertaining to hybrids in that document. Its really how to use the Honda-specific scanner/charger/diagnosis system for 12v batteries. What am I missing?
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