Author Topic: Battery failure  (Read 49839 times)

stani

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Re: Battery failure
« Reply #30 on: May 04, 2026, 10:09:29 AM »
It is a bitter irony paradox that although the Jazz provides information and warnings about all sorts of things, it says nothing about this very important issue — the impending failure of the 12-volt battery…
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Jazzik

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Re: Battery failure
« Reply #31 on: May 04, 2026, 01:21:36 PM »
the impending failure of the 12-volt battery…


As long as it remains merely a threat of a failure, your Jazz always starts without any problem, right? That's why I wondered who has actually fallen victim to this (alleged?) 12-volt battery problem.
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exAudi

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Re: Battery failure
« Reply #32 on: May 04, 2026, 02:40:32 PM »
It happened to me just after getting car when I was exploring/setting up the audio and other features with the power by accessory option; car in garage.

Complete ignorance on my part as to how limited the 12V battery was in comparison to all my previous ice cars😖

I had to put the battery on charge (via existing CTEK) in order to resume normal operation😀.

Already discovered clubjazz so absorbed lots of useful advice on the subject.

Subsequently fitted a battery voltage indicator (decided on relatively expensive Ansmann one as have their excellent 1.5V/9V cell chargers) which simply plugs into car 12V socket. It gives good indication of state of 12V battery when I first power up and confirms charging when  engine/HV battery running.

Most recently I have got myself a NOCO GB20 to give back up when out and about.

5thcivic

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Re: Battery failure
« Reply #33 on: May 04, 2026, 03:15:23 PM »
3 Civics, a Jazz and an E, never needed one yet!

stani

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Re: Battery failure
« Reply #34 on: May 04, 2026, 03:54:35 PM »
I was also looking for information about possibly replacing the 12v battery in the Jazz.

If the information is correct, it's not very happy...

The Honda Jazz uses the Japanese B19R format, not the European LN0.

The B19R has the opposite polarity (right +), does not fit the height of the holder, does not fit the shape of the foot, compared to the LN0.

The only supposedly correct battery for the Jazz allegedly is: GS Yuasa YBXAGM35R (B19R, AGM, right +)
« Last Edit: May 04, 2026, 03:58:51 PM by stani »
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coldstart

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Re: Battery failure
« Reply #35 on: May 04, 2026, 03:55:03 PM »
the impending failure of the 12-volt battery…
As long as it remains merely a threat of a failure, your Jazz always starts without any problem, right? That's why I wondered who has actually fallen victim to this (alleged?) 12-volt battery problem.

Well, I do insure against all kinds of things that (hopefully!) will never affect me!
So, in the big picture of total costs, the expense for a CTEK and a NOCO GB20 doesn't bring me to ruin.
However, it gives me peace of mind!

Whilst I (so far) never had to use the NOCO jump starter I admit to periodically hook up the Jazz to the CTEK charger during the cold season (shorter and less frequent rides with more power drawing accessories active like heated seats, heated steering wheel and rear demister).


JB

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Re: Battery failure
« Reply #36 on: May 04, 2026, 04:37:53 PM »
Two came up at Yuasa only posted to show fitting time top right.
https://www.yuasa.com/uk/ybx5054
https://www.yuasa.com/uk/ybx7054
£59 difference between the two.
I forgot what I came to forget.

stani

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Re: Battery failure
« Reply #37 on: May 04, 2026, 05:49:03 PM »
I read about a similar problem with a 12V battery on the Czech Honda forum 3 years ago, it was about the HRV (here and here - it is translated into English). I only remembered it now.
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5thcivic

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Re: Battery failure
« Reply #38 on: May 04, 2026, 08:17:12 PM »
Bosch S4018 ?

stani

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Re: Battery failure
« Reply #39 on: May 05, 2026, 05:28:25 AM »
Two came up at Yuasa only posted to show fitting time top right.
https://www.yuasa.com/uk/ybx5054
https://www.yuasa.com/uk/ybx7054
£59 difference between the two.
Copilot: Both are classic flooded lead-acid batteries (SLI), not AGM, and they are not in the B19R format that the Jazz 2025 requires.

Bosch S4018 ?
   Isn't it AGM? AGM is very important...

« Last Edit: May 05, 2026, 05:33:22 AM by stani »
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John Ratsey

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Re: Battery failure
« Reply #40 on: May 05, 2026, 08:39:31 AM »
My 2022 HR-V had a flat battery due to a bug in the perimeter control system (the vehicle didn't power down properly when locked) but my 2020 Crosstar and the current Jazz have behaved themselves despite not moving for a month or more during the winter months. However if the vehicle does move, it's for a decent journey. 
2025 Jazz Advance, previously 2022 HR-V Elegance, previously 2020 Jazz Crosstar

Jazzik

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Re: Battery failure
« Reply #41 on: May 05, 2026, 12:05:20 PM »
I was also looking for information about possibly replacing the 12v battery in the Jazz.
I really wonder why you would do that. A bit VERY early, isn't it?
In your profile I see: My Honda: Honda Jazz e:HEV 2025
In Dutch, there is this proverb: "A person suffers most from the suffering he fears." This means that the fear of potential problems is often worse than the problems themselves (which often never become reality).
If nothing goes right, go left!

Lord Voltermore

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Re: Battery failure
« Reply #42 on: May 05, 2026, 12:09:07 PM »
Even conventional cars with full sized batteries needed to crank and  start their ICE  engines are vulnerable to flat batteries these days , unless they are used  regularly for long enough journeys to top up the battery. (Or trickle charged etc)  .

All modern cars have computer systems etc  running 24/7 and many are 'connected'  to various mobile networks etc.  This small but constant draw can  discharge a full sized,  fully charged battery in a surprisingly short time  .  A bit like having to keep mobile phones and computer devices charged.  Even in the  'good old days' car batteries unused for long periods  had to cope with normal parasitic draw etc. Now they still have this  plus all the new stuff. 

Maybe I am biased having had no problem  with the small 12v battery in 5 years  (admittedly replacing the car at 3 years)   If it does let me down I have a back up plan  (jump starter power bank) . If that doesnt work I'll call for assistance.    (assuming I kept my mobile phone charged. ;D)

I really dont think its that much of a problem . It doesnt need to crank the ICE.  . If and when I need to replace the 12v battery ,and Yuasa really is the only compatible choice, at least its a very well regarded  brand. 
« Last Edit: May 05, 2026, 12:10:48 PM by Lord Voltermore »
My IQ test came back negative

stani

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Re: Battery failure
« Reply #43 on: May 05, 2026, 12:51:50 PM »
Lord Voltermore: but this is a serious damn problem.

I can’t imagine this happening out in the middle of „nowhere.”

I’m not sure whether my previous post was understood correctly (perhaps due to my poor English – apologies), but this is honestly the worst issue I’ve encountered with the Jazz so far.

Now I know that in such a case it is necessary to use a jump starter power bank and drive somewhere to recharge the battery.

But as I wrote, the car completely locks up without any prior warning. The engine, gear lever, brakes, and traction battery are blocked. Main display off. In the end, I couldn't even lock the car. 
The only thing that "worked" was a series of lockout warning messages on the driver's display.

As I wrote, this is my first hybrid, I didn't want to get involved in anything myself, so as not to mess something up even more. The Honda service is 3 km from me, the car is under warranty, call Honda Assistance. Honda Assistance couldn't help, they called a tow truck, which took my car to a Honda service center - the easiest and fastest solution to the problem at that moment and everything is free. It wasn’t until I went to the Honda service centre that the mechanic clarified and explained everything to me.

In a “normal” car, it's easy to tell - the starter barely turns over, the dashboard lights go out - you take the starter power bank  connected to the battery and the car starts.

Yes, maybe I was under the mistaken impression that the traction battery would somehow replace the small 12V battery if needed. Now I know that I will always have to recharge the small 12V battery before and after winter.

It's also possible that it was discharged because I drove very short distances in the winter with the heated seats on (But it doesn’t show the status of the 12V battery anywhere!). It could also be that it was already half discharged when I bought the car from the dealer where it had been sitting for some time.

But it probably drains the most during updates, when Wi-Fi is on, as the mechanic told me, you need to have the engine running.

But what annoys me the most is that you don't get any advance warning at all, as I wrote above.

« Last Edit: May 05, 2026, 01:05:51 PM by stani »
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5thcivic

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Re: Battery failure
« Reply #44 on: May 05, 2026, 03:55:27 PM »
Isn't it AGM? AGM is very important...

Not supplied with an AGM so if you've not had any problems don't need one?

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