Battery failure

[Jazzik]

I hope there isn't going to be an outbreak of some kind of "Toyota 12v battery panic illness" here?

My two questions were:
1. Who among you has ever been unable to start the Jazz due to a dead 12-volt battery?
2. Was the battery perhaps discharged due to your own fault then? (Meaning: fumbling around with electricity consumers without having te car in "ready"?)

[exAudi]

Yes Stani that’s the Ansmann that I have permanently plugged in to the 12V socket. Not as if I use the 12V for anything else.

As regards accuracy, I have checked it against my Martindale meter and it’s correct to 2nd decimal.

Hopd this helps.

[5thcivic]

Please don't rely on AI answers for your facts. Many many electronic, camera, hi-fi, and other technical questions I put into google for instance the first paragraph is more often wrong than right.

[JB]

Original battery Panasonic £177-38
https://www.honda-parts.eu/eu/car/parts/battery/battery-44b19l-31500-tzb-e01
https://www.bike-parts-honda.com/honda-motorcycle/assignment_spare_parts/31500TZBE03
£79 more than Yuasa heavy duty, £89 more than standard Yuasa
https://www.yuasa.com/uk/ybx3202
https://www.yuasa.com/uk/ybx5202

[zdan]

10 extra quid for the yuasa heavy duty 5y warranty (5000 series) that sounds good.

I'm still running the original 12v battery and 55k miles (September 2020). I wonder if I shall I change it now or wait till it stops working.

It read 12.45v the next morning before I started the car.

[coldstart]

It read 12.45v the next morning before I started the car.

According to this source your battery is at 70 to 80% charged (sealed gel technology).

As for battery technology: The Jazz's 12V battery doesn't have to actually crank the ICE, so buying an AGM replacement seems to me somewhat over the top and a waste of money.

[Nollypra]

Is this battery problem ever going to be sorted, the Yaris has the same problem. Just putting a normal battery in the car might help. An ICE car can sit in the garage for ten years and still start. Isn't there a way to use the EV battery start the car when the 12v battery fails, I think there is a car that can do this, can't remember the model.

No chance a modern car will start after being in a garage for 10 years! That's absolutely rediculous!!

[Lord Voltermore]

GSF car parts  show the Yuasa YBX5054 as compatible with the  mk4  Jazz HEV . £65.09  ( which may include delivery)

https://www.gsfcarparts.com/products/ybx5000-silver-high-performance-smf-battery-5-year-warranty-za042670

https://www.yuasa.com/uk/ybx5054

At first glance  this does  seem a closer match  in physical size than the YBX3202   or YBX5202.   

However  the Yuasa site shows it as being ca/ca -ie calcium terminals.   Although this has many advantages  I believe  calcium batteries are more vulnerable to permanent damage if  allowed to deeply discharge   more than 3-4 times. And also need a compatible trickle charger to charge them above  80%.   (Good smart chargers are compatible)  . 

The specification given by Honda for the  44b19L  makes no mention of it being calcium.  But is this just an omission and the battery is in fact Calcium type, which might explain why some people have had problems?   But as the Panasonic/yuasa  44b19L appears to be exclusive to  Honda models  maybe its specifically avoids calcium   to avoid this problem .  If  so its not been completely successful   

I have no figures to back it up but have the impression that early Mk 4's ,which used a different brand of OE battery  ,seemed ,even when new, to be more vulnerable  than later cars with Panasonic batteries.   So maybe the Panasonic is a different spec rather than just a better brand.           But is this enough of an advantage to pay £177 for a replacement?  I think I would  take my chances with a £65 one rather than pay £177     But might regret doing so if  it leaves me stranded    )

[stani]

I my Jazz is "Panasonic 44B19L - MF" (31500-TZB-E01).

-------------------
Edit: I confronted Copilot about his previous claim regarding the AGM battery, but he suddenly reversed himself completely.  I don't know if he's babbling again, so I'd take it with a grain of salt:


Verdict

Panasonic 44B19L‑MF = a classic flooded Ca/Ca battery.
Therefore, the replacement must be a Ca/Ca B19L, not AGM or EFB.

Briefly and precisely: NO — an AGM would not be “better” in your case. 
And now I’ll explain it to you technically, practically, and without any nonsense, so it’s settled once and for all.
 AGM vs classic Ca/Ca in Honda (Jazz / HR‑V / City / Fit)
✔️ When is AGM better?

AGM only makes sense when:

    the car has strong regenerative charging

    the car has a high‑load start‑stop system

    the car has high electrical demand (powerful audio, frequent short trips, taxi use)

    the car originally comes with AGM → then it must remain AGM

This is not your case.
❌ Why AGM is not a better replacement for the Panasonic 44B19L‑MF
1) Honda Jazz e:HEV does NOT use AGM from the factory

Panasonic 44B19L‑MF = a classic flooded Ca/Ca battery.
2) The car’s charging profile is not ideal for AGM

AGM requires:

    higher charging voltage

    a different charging curve

    different temperature compensation

Honda does not provide this → an AGM will charge worse, not better.
3) AGM in the small B19L format has a poor price/performance ratio

AGM in this size:

    has the same capacity

    has similar cranking power

    costs twice as much

    and brings no real advantage

4) AGM is heavier and more sensitive to overcharging

Honda’s alternator is not tuned for AGM → it may:

    undercharge it (more frequent deep cycles)

    or overcharge it (shortened lifespan)

The real outcome if you installed an AGM

    no faster starting

    no longer lifespan

    no higher capacity

    higher price

    lower compatibility with the car’s charging profile

    potentially shorter lifespan than Ca/Ca

Verdict for you

AGM is not better. 
For your type of car, the best choice is a classic Ca/Ca B19L, exactly the same as originally installed.

The best options are:

    Bosch S4 018

    Exide EB440

    Yuasa YBX3053