12v battery maintenance, issues, etc.

[flash22]

The AUX Battery is for safety among other things - you need a way to isolate the high and low voltage systems the 12v system controls the high voltage side by the way of multiple contactors

16v lithium are higher density but are still regulated down to 12v

[AisinW]

@Yaris Hybrid 2021 if it is just 12V Battery problems, the solution is very simple. update the Emergency call system and put a brand new AGM Battery that have 3 years warranty. Additionally, we can always have a jumper pack on the trunk. A good £80 jumper Battery pack can do >30x jump starts on hybrid in 1 charge. 

Newer model cars often have problems until certain years of update.  Some has almost 0 bugs since day 1 like Prius 4, or Corolla 1.8L hybrid. Prius 3 has so much revisions until finally fixed in fall 2014 when they update piston and piston rings. Yet, Prius 3 is still reliable compared to VW, PSA, Renault, Opel, etc.  It is just not 300k miles trouble free cars like Prius 2 or 4. 

[TonyHSD]

Slightly off topic but if anyone follow that guy, he is a legend. In this video no need to watch the full length just watch few minutes and note the cars, omg more Priuses than any other place in the world per person, I am positive about it. Just unbelievable. , it’s pretty much all they drive all cars are Toyota.
And btw the driving conditions are very rough there with hot and dry summers and cold and snowy winters. No Battery problem, no complains. 👍

 

[AisinW]

NiMh Battery is more durable under harsh cold and hot condition than any Lithium Battery.  However, the density of energy is about 1/2.  It is cheap, not easily burned, recyclable. Heavy duty truck like Tundra and Tacoma/Hilux hybrid still use NiMh. 

It is not the same as Panasonic Eneloop Battery that also last forever, unlike Energizer NiMh or Varta.  it uses LaNi8 cathode. Our hybrid car has huge weight of rare earth materials but Lanthanum is pretty cheap. 

By the way, this links shows what is the proper procedure maintaining 12V and HV battery.  It is supposed to be in our manual handbook but no one read handbook either. 

https://static.nhtsa.gov/odi/tsbs/2019/MC-10154807-9999.pdf

 

[FROSTYBALLS]

Similar topics merged.

[RickyC]

20 hours ago, flash22 said:

16v lithium are higher density but are still regulated down to 12v

According this video the full car low voltage circuits are running to 16V instead of 12V.  

 

[anchorman]

23 hours ago, CruxisCore said:

Aight, mostly trying to fish around to see if these Mutlu batteries stop showing up on Yaris' newer than 2022 january.

Anyone with a 22 or 23 Yaris with a Mutlu? 😄

Yes, me.  Jan 23 reg.  

[Mikw]

So, are these possibly substandard batteries in all of the earlier Mark 4's.

Mine was new in December 2020. Touchwood, it's been great so far.

[CruxisCore]

11 hours ago, Mikw said:

So, are these possibly substandard batteries in all of the earlier Mark 4's.

Mine was new in December 2020. Touchwood, it's been great so far.

We have seen some variation somewhere within these 40 pages lol. Some have had AGMs, some have had wet cells, some Mutlu, some something else.

[Stopeter44]

Just had my first "wouldn't start after long period", event. 20 days without running the car. I'd left the car, twice, 15 days before, but in airport carparks, and not had a problem. Toyota assistance fixed it, but the technician who came couldn't get his booster pack to start the car. He had to resort to the old fashion jumper cables way. 

That was about a week ago, and my late 2021 Yaris is running fine, but I've been using it everyday. I called the dealer, who offered to test, and change if need be, the Battery. However, I couldn't go to my dealer until 3 days after the "No Start" incident. The service department, although sympathetic to the problem, told me there was no point in testing the Battery, because it would check out fine.

What do you think ?

The car was left in an underground garage and there's no mobile phone coverage down there, could that make a difference, with respect to the emergency call system ?

Thanks.

Edited July 8, 2023 by Stopeter44

[Max_Headroom]

19 hours ago, Stopeter44 said:

The car was left in an underground garage and there's no mobile phone coverage down there, could that make a difference, with respect to the emergency call system ?

Quote

20 days without running the car. I'd left the car, twice, 15 days before, but in airport carparks, and not had a problem.

I doubt its anything other than the 20 days it had been stood still you were probably lucky to get away with it when you left it 15, if you are going to leave it for long periods i would get a jump pack peace of mind for less than £100.

[Roy124]

2 minutes ago, Max_Headroom said:

If you are going to leave it for long periods i would get a jump pack peace of mind for less than £100.

Peter did say the jumper pack didn't work. 

Interesting. 

[Stopeter44]

3 minutes ago, Roy124 said:

Peter did say the jumper pack didn't work. 

Interesting. 

Yes, it didn’t work, and it was a heavy duty pro unit. The technician wasn’t pleased. However, there’s a chance that it hadn’t been adequately charged beforehand.

 

I am considering the jump pack, I’m just wondering which one to get. I also notice the inexpensive ones, at least, do not have very long cables, which might be a problem on the Yaris ?

Edited July 8, 2023 by Stopeter44

[Max_Headroom]

16 minutes ago, Roy124 said:

Peter did say the jumper pack didn't work. 

It may not have been fully charged,  i haven't read a single post in the many 12v related threads here where a member hasn't managed to get their car going with a decent jump pack so something was obviously wrong with his.

[Jasper.]

You don't need long cables , well not on the Mk4 as the jump point is at the fuse box under the bonnet..

[Max_Headroom]

 

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[TonyHSD]

Tbh 20 days is a long time without use and many cars especially those loaded with electronics or those with old Battery will have the same issue. 
I don’t know if having no signal can amplified the Battery drain but it is possible as the car dcm will keep searching for a signal similar to a mobile phone, or at least on theory. 
I kept my car recently for 5 weeks without driving but after around 14 days or so and decided to fully charge the Battery with a smart charger and no wait until battery dies completely as this is not good for the overall battery health.  
Jump starter as emergency is a good idea. Why the car didn’t start could be becoming it was not connected properly first time or there was no enough charge, I don’t see any other reason. 

[Stopeter44]

49 minutes ago, TonyHSD said:

Jump starter as emergency is a good idea. Why the car didn’t start could be becoming it was not connected properly first time or there was no enough charge, I don’t see any other reason. 

OK, I think that wraps it up, nobody has commented on the dealer's position on the issue.

[Stopeter44]

 

Here's what I'm talking about "short cables". With 20cm of cable from a booster I'm never going to be able to use the booster as the manual suggests. Is there another good spot (D) that works ?

[Jasper.]

I used one of the strut top mount nuts.

[Stopeter44]

Thanks, I'll look more closely.

[jthspace]

I have 2 MX5's so sometimes it may be a week or so with one of them pining for a run.  My 1993 can be started OK almost how long she stands; the Mk4 will flatten it's Battery in 7 to 10ndays, even with alarm internal sensors turned off.  Once it goes flat, istop will also stop working (can be a blessing). Anyway, long story short, I bought one of these.  Recommended!

LINKY

[anchorman]

The dealer is right.  If you charge a Battery for 24 hours then test it, invariably it will test ok.  I was dismissive about the Mutley (apologies to Whacky Races) batteries losing capacity but although I haven’t had one do it, a mate has and after several fails with no good reason to do so, he’s taken my advice to go to Yuasa 5000 with a 5 year warranty at his own expense.  It was £83 and I fitted it for nothing.  I think that’s a better option than taking it to the dealer with a 2 week lead time and a probable outcome.  We need to validate this fix now but not heard from the member on here that fitted one (was it Derek?) having any more problems.  

[Stopeter44]

49 minutes ago, anchorman said:

The dealer is right.  If you charge a battery for 24 hours then test it, invariably it will test ok.

Thanks Anchorman, I was wondering what a member with trade experience would say.

[Stopeter44]

8 hours ago, jthspace said:

Anyway, long story short, I bought one of these.  Recommended!

Ain’t no sunshine… in my underground parking, (apologies to BW).