Clubjazz - Honda Jazz & HR-V Forums
Honda Jazz Forums => Honda Jazz Mk4 2020 - => Topic started by: ninanina on January 19, 2025, 01:52:51 PM
-
I’m trying to find out how many people have had issues with their 12v battery
I don’t use my Jazz every day and when I do it’s nearly always for short city journeys
Since I purchased my Jazz about a month ago I’ve had no problems with the 12v system even with this cold snap we’ve been having
One of the reasons I went with the Jazz over the Toyota Yaris was because I knew the Yaris suffers 12v issues; there are many other reasons why I chose the Honda over the Toyota though
I’ve purchased a cigarette socket 12v tester and it indicates 12.2 or above
I also own a Noco GB40 starter pack just in case
-
Do you have off road parking with power access ?
-
One of the reasons I went with the Jazz over the Toyota Yaris was because I knew the Yaris suffers 12v issues; there are many other reasons why I chose the Honda over the Toyota though
My Jazz has just 3 years, I have not problems with 12V battery for now. Since I don't use the car every day, I'm starting just this winter recharging the 12V with an external charger (CTEK) sometimes, to prevent an excessive discharge.
Before the Jazz, I had a Toyota Auris, the 12V battery was the same that was on your Yaris. I had problems only after 9 years, during the COVID time, since I used the car too little.
Note that Toyota battery 12V is more reliable generally, it is not with liquid lead. It may last more years, but needs more time to be recharged, so you have to drive for longer time to keep it charged.
The 12V battery used on Jazz is a standard lead battery. It can recharge quicker, but I think that unlikely it may last 10 years...
-
We have had our Jazz for 3 years and 5 months now. It has never seen a battery charger, booster/jump starter or tester. We often drive relatively short distances.
It always starts without any problems, even if it has been standing still for days. Once it was not driven for 10 weeks and started without any problems.
-
Mine is just over 2 years old. Used for very short in and out of town trips of around 2-3 miles each way, always from a cold start with a handful of 30-50 miles trips per annum.
The car often sits for days or even a week or two without use. Never had a problem with the battery so far, nor do I really expect to for at least another year or so.
My experience with such treatment, my cars only start to show an occasional charge battery sign when they get towards 4 years old and then an occasional quick charge with a charger extends the battery life.
-
Do you have off road parking with power access ?
Unfortunately I don’t so there’s no chance of me using a charger
-
We have had our Jazz for 3 years and 5 months now. It has never seen a battery charger, booster/jump starter or tester. We often drive relatively short distances.
It always starts without any problems, even if it has been standing still for days. Once it was not driven for 10 weeks and started without any problems.
That’s very reassuring to hear
-
I’m trying to find out how many people have had issues with their 12v battery
I don’t use my Jazz every day and when I do it’s nearly always for short city journeys
Since I purchased my Jazz about a month ago I’ve had no problems with the 12v system even with this cold snap we’ve been having
One of the reasons I went with the Jazz over the Toyota Yaris was because I knew the Yaris suffers 12v issues; there are many other reasons why I chose the Honda over the Toyota though
I’ve purchased a cigarette socket 12v tester and it indicates 12.2 or above
I also own a Noco GB40 starter pack just in case
I am wondering whether you have been worried about comments on this forum? I must admit I have also been apprehensive and my car isnt 2 years old yet.
Remember comments about the 12v battery have only come from a few people out of hundreds.
I don’t expect to have any problems and nor should I . And if I did then to Honda I will go ;D
-
My Jazz is fitted with a Panasonic 12v battery and I'm confident I won't have any issues even though I do short trips and the car not being used for two or three days a week, fortunately I can give the battery an occasional charge for added peace of mind. I briefly owned a Toyota Yaris Cross which was probably fitted with a Mutlu 12v, a brand that was allegedly causing all the battery issues, some owners were "upgrading" to Yuasa but the jury is out as to whether this was a solution
-
We have had our Jazz for 3 years and 5 months now. It has never seen a battery charger, booster/jump starter or tester. We often drive relatively short distances.
It always starts without any problems, even if it has been standing still for days. Once it was not driven for 10 weeks and started without any problems.
What is your total mileage ?
I've only done 4,500 miles in 3 years 4 months so a 12v charge has probably saved mine
-
Almost 25000 km. = 15500 miles.
-
Thanks
I imagine that if you use your car at least once a week for half an hour minimum that may be enough to keep it healthy
In my case it can be garaged for up to a month at a time as I only do DIY and tip runs and one trip each month just to top up the HV battery
-
I imagine that if you use your car at least once a week for half an hour minimum that may be enough to keep it healthy
The suggestion was given in COVID time, was to use the car at least one hour a week to keep the 12V charged.
If the battery charge is low, the car can start anyway but the battery may be damaged, on long time, when you keep always a low charge.
-
Agree with that
Years ago 'she' left the lights on and totally flattened the battery. Even after a 200 mile journey the battery died overnight
-
I asked my Honda garage about the battery draining quickly. The answer I got was as follows: 'It is normal for a car to use some power when it is idle. A decrease of about 0.5v in a week is not alarming. Your car is started by the electric motor. The computers that control this electric motor generally need about 10v'
-
All cars are started by an electric motor :'(
In the MK4 case it's the HV battery not the 12v battery
Got to love some dealers training
-
The point is about the voltage needed to boot the regulators powering the microprocessors and thus enable the HV relays to be connected to and control the motor. If the car does start on 10V that is interesting information.
-
The point is about the voltage needed to boot the regulators powering the microprocessors and thus enable the HV relays to be connected to and control the motor. If the car does start on 10V that is interesting information.
I find the 10V threshold implausible. I had an interesting experience with my HR-V after it had been standing for the better part of two months. The car unlocked as usual, the power button worked but the dashboard then filled with warning symbols and error messages telling me that numerous features weren't working. The screen in the middle of the dashboard didn't power up and I concluded that there wasn't enough life in the battery to close the contactor to connect the HV battery. There was no other indication that the 12V battery was low.
IIRC the 12V battery measured over 12V on my volt meter. I connected my smart charger which, after less than a minute claimed the battery was fully charged (which it obviously wasn't). Fortunately I had an old dumb charger which pushed some juice into the battery after which everything was OK and the vehicle started normally. It's possible that the 12V battery isn't in the best of health as two years ago it had a dose of the HR-V's flat battery problem (when a software bug randomly didn't power down everything when the doors were locked).
-
That sounds like a battery that can show 12v on a voltmeter which requires no current, and a smart charger, display likewise, but cannot supply several amps to fire up the electronics and displays without being charged with some power first.
I am slightly surprised by the 10V figure, but it is perfectly possible for a good battery as plenty to spare to regulate 5V supplies for the electronics and any step up regulators for displays etc.
-
May be it is usefull to add a part of the text of an old post of mine regarding the 12v battery during long time stand still:
.........to share our last experience with a long stand still during winter (every time about 2 and a half months). I have already shared the data of the battery-charge of our Jazz in the first 2 years. I can add the figures of this year. For clarity, I give the data of the 3 years together:
2022: departure 12,8V return: 11,9V
2023: departure 12,6 V return:11,6V
2024: departure 12,5V return: 11,7V
Even considering the soft Dutch winters (certainly in a garage), the small 12V battery is quite sturdy. The charge of the battery is deteriorating, but very slowly. And did I first wonder if the battery could cope with one long standstill of 2 and a half months (and was already searching for a fitting EFB-battery for replacement) now my only concern is that I can get exactly the same battery when I have to change the battery in a couple of years......
In two month time I could add the figures of 2025, but I will only mention it when the battery this time says that I have asked too much and that I have to use a charger or I have to replace it. So no news is good news
-
When my current car (excuse pun) goes through periods of little use the battery might show less than 12v. Its less than 4 months old.
I started it this morning. Initially it showed 12.0V dropping to 11.7 / 11.6 volts for about a second whilst the computer did its checks, rising to 14.4 charging voltage when the ICE started. (It also continues to receive 14.4 volt when in EV mode with the ICE off)
It was last used a week ago for about 4 miles, parked for a few hours then same journey home. And has only had similar pattern of little use since its last long trip in December. (long trips planned soon)
With my previous mk 4 my main concern was that the accepted wisdom for 12v lead acid batteries is that 12v or less means its flat and liable to irreversible cell damage. But it was sometimes under 12v when little used. Periodically using a mains trickle charger is probably a good idea but I was too lazy to ever put an extension lead out to the driveway :-[ . And I only ever used a solar charger once, early on. Despite this the car never failed to start in 3 years of ownership. .
My understanding is the computer does some initial checks .If these are correct it then throws a heavy duty solenoid to connect the high voltage battery which then starts the ICE. I can accept that 10 Volts may be enough for these functions. If there is not enough power left in the '12v' battery to throw the solenoid the ICE wont be able to start but there may be warning lights. But some external charging or a momentary boost from a battery pack jump starter should be enough for the HV battery to connect and take over.
-
I’m not so sure, I think my 12v gave up on me this morning. Its now with the dealer to check
-
I’m not so sure, I think my 12v gave up on me this morning. Its now with the dealer to check
As your Jazz is 4 years old, and possibly the 12v battery a bit older, it’s probably a bad battery
Please let us know what the dealer says
-
I do hope that’s all it is tbh!
-
I do hope that’s all it is tbh!
What was the outcome?
-
Just found out battery needed replaced. There is another fault however so they are trying to replicate it and I’ve left the car with them.
-
Just found out battery needed replaced. There is another fault however so they are trying to replicate it and I’ve left the car with them.
Well at least they found the 12v battery needed replacing
Can I ask what the other fault is?
-
Turtle icon with unexplained low and high temps appearing - dealer thinks it needs a cable replacing (god knows) but we need the turtle to reappear to get the code. 😭
-
I had been in Australia over Christmas and the New Year. Arrived back home on January 6th to sub zero temperatures. The next morning my 2021 Jazz Crosstar wouldn't start. Doors unlocked but wing mirrors didn't fully open. Pressing the Start button resulted in no engine start and an error message on the driver's display saying that there was a fault on the auto braking system. Called Honda Breakdown who called out the AA. Because it wasn't a priority (fair enough) they didn't arrive until after dark. It was snowing heavily, but the AA guy was very good and diagnosed a dead battery. He got the car started with a power pack and then attached his diagnostic tablet to the service port. The upshot was a new (Bosch) battery with a 5yr warranty which cost me £135. Car has been fine since.
-
I just checked my 12v charge again with my little £6 (Amazon) 12v cigarette socket gadget
It is still showing 12.4v in accessory mode and over 14v while running and charging
I’m happy with both figures particularly as most of my journeys are pretty short town driving
-
If I was leaving the car for a few weeks I think I would fully charge up the battery using my trickle charger, if it's a bit low when you go away then it's odds on it will be flat when you come back.
-
I just checked my 12v charge again with my little £6 (Amazon) 12v cigarette socket gadget
It is still showing 12.4v in accessory mode and over 14v while running and charging
I’m happy with both figures particularly as most of my journeys are pretty short town driving
After owning a Toyota Yaris Cross Hybrid with all the (flat) battery problems they are having I was a bit concerned when I got my Jazz which is only doing short runs, my concerns were unfounded, the battery is consistently showing 12.4V when tested, the Toyota would show 11.2V with the same usage which prompted me to charge the battery but in fairness it always started. I do charge it up every 3 weeks or so even when it's showing over 12V, it's no trouble and a bit easier than charging the Toyota