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Discussion Starter #1
Hello,

I have a 2014 EX CR-V and am wondering whether i have a battery charging issue and a battery drain issue.

March last year the car failed to start due to battery, car taken to a Honda garage and they replaced the battery (they said as it was 3 years old it was end of life)

By July ish last year i noticed that the battery would not charge to more than 12.4v and would drop from 12.4v after the last journey to 12.1v overnight, which as far as i can tell from battery tech forums is a reasonable percentage of the battery capacity. This behaviour in the battery continued like this, so i decided to buy a trickle charger / maintainer to keep the battery topped up between drives (i work from home regularly and don't use the car every day)

January this year the car struggled to start a couple of times, so i booked it in to a Honda garage to have it looked in to for battery drain / charge issues, they had it for 5 days and in the end concluded that the battery drain was normal (their test was to check battery drain before they went home and then again in the morning, each time it was 0.02A) and that the battery had a dead cell, so replaced the battery for free, job done.

Since having the new battery, there is a difference, it started charging to 12.7v but now will only charge to 12.6v, maybe this is the newness wearing out?
But still the battery will drain down when not in use, in my opinion, more than it should and i think, if my calculation are correct more than a constant drain 0.02amps.

Also, during a journey it appears that the car will not always charge the battery, often short journeys the voltage will not go up at all to indicate charging and will stay at the voltage just before starting the engine, in the low 12v ish range, sometimes the voltage will fluctuate during a journey between the 12v ish and 14.2v of normal charging level with engine on, but does not appear to stay constantly at 14.2v (or 13.6v of the engine idling charge level) during the full journey)

Is this normal? to me surely the car should charge the battery if not fully charged (which 12.4v is not) all the time if the engine is on?

Here is the current charge history since last journey:
Sunday15:04Start 64 minute drive12.4v
18:18No voltage increase after journey12.4v
Monday06:5712.3v
08:18Start Charging
11:1313.6v
11:20Showing as charged
16:3413.4v
16:37Taken off charge
22:5512.6v
Tuesday06:2012.5v
21:1612.4v
Wednesday22:3912.4v
Thursday06:0412.3v

Does it sound like there is a battery drain issue and / or battery charge issue? or is all this normal for a CR-V?

Any help / advice / insight appreciated.
 

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Discussion Starter #3
thanks for the link. if i understand it correctly, this does sound like the charging behaviour i have seen on my car. Although i would personally think that if the battery was not fully charged when the ignition is on then the system should try and charge the battery as fast as it can until fully charged, there is no way to know how short the journey will be.

How about the discharge? It seems overly fast to discharge and would not enable the car to be left for long at full charge before not having enough charge to start the car in only days. I would have hoped it would be measured in weeks.

If the following chart is accurate, then my car battery lost 30% of its charge in only two and a half days:
Capture.PNG

but i think that chart is a bit optimistic, most other chart have 12.3v at around 60% (but they did not look as good :) )

Isnt losing 30% of the batteries charge in only two and a half days very high?
 

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Discussion Starter #4
thanks for the link. if i understand it correctly, this does sound like the charging behaviour i have seen on my car. Although i would personally think that if the battery was not fully charged when the ignition is on then the system should try and charge the battery as fast as it can until fully charged, there is no way to know how short the journey will be.

How about the discharge? It seems overly fast to discharge and would not enable the car to be left for long at full charge before not having enough charge to start the car in only days. I would have hoped it would be measured in weeks.

If the following chart is accurate, then my car battery lost 30% of its charge in only two and a half days:
View attachment 128515

but i think that chart is a bit optimistic, most other chart have 12.3v at around 60% (but they did not look as good :) )

Isnt losing 30% of the batteries charge in only two and a half days very high?
 

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thanks for the link. if i understand it correctly, this does sound like the charging behaviour i have seen on my car. Although i would personally think that if the battery was not fully charged when the ignition is on then the system should try and charge the battery as fast as it can until fully charged, there is no way to know how short the journey will be.

How about the discharge? It seems overly fast to discharge and would not enable the car to be left for long at full charge before not having enough charge to start the car in only days. I would have hoped it would be measured in weeks.

If the following chart is accurate, then my car battery lost 30% of its charge in only two and a half days:
View attachment 128515

but i think that chart is a bit optimistic, most other chart have 12.3v at around 60% (but they did not look as good :) )

Isnt losing 30% of the batteries charge in only two and a half days very high?
I’m not 100% sure how the Honda ELD works but I had issue with it. Driving normally at night, the lights would flicker out of the blue. You would think the system is smart enough knowing the light is on and should tell the charging system to supply sufficient power to the car so the light doesn’t flicker. If you have one of those voltmeter you can plug into the cigarette plug and see if the alternator sending any charge to the car while driving. Honda ELD system has been around since the 90’s and haven’t change at all looking at the wiring diagram. Since there’s so much more electronic in newer car I expect some redesign or some sort.

We have experience with a fairly new < 1 yr old 51r size flooded battery discharging all the way down and not being able to start the car in cold days (<32 deg f) after not driving for 3 days or so. We got a new AGM battery from pep boys recently and it seem to be working fine. It holds enough charge for a week to start the car. AGM battery supposed to have a lower discharge rate than regular flooded battery. Who knows if that makes a difference.
 

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Discussion Starter #6
It does not sound good if the system cant cope with normal situations like supplying enough power to power the lights at night. luckily so far i have not had that issue, but i am sure the issue on my car is getting worse so maybe it will come.

I think i will have to buy one of those voltmeter cigarette plug devices, they sound good, and i am sure they will show a lack of battery charging whilst in use.

Fully draining the battery after only 3 days with temps around 32f does not sound right at all, 32f is not excessively cold and i would expect it to last longer than that.

My car goes in for its annual service on Monday, they said they would run some more tests, but i am sure they will all come up clear, again....
 
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