Battery Life.

[Kansasmike]

I will be out of the country for 69 days, my Yaris Cross (71 Plate) will be in my garage, how long will the charge last, not long I imagine. As such should I leave it unlocked so the alarm does not go off when Battery is being re-charged.

[TonyHSD]

Hi, 

your best solution is to fully charge your 12v Battery either with external charger or via ready mode for 60 minutes and disconnect the negative terminal and leave the car unlocked prior to your travel. 
There is another way of disconnecting a main fuse so the car is disconnected from 12v supply but let others talk about it as I haven’t done that myself. Otherwise if you leave the car just like that after that many days you will not be able to start it on your return and most likely you will need to buy a new 12v Battery. 
 

[dash]

Solar panel positioned on garage roof should maintain Battery level (30W to be on safe side)

 

[MikeSh]

For that long just disconnect the Battery. It won't lose any significant charge like that, so charging it before leaving is optional but preferred if you have something to do that easily.

Leaving any sort of charger connected unsupervised is a risk. Eg, a rodent chewing a cable could cause a short.

[HarryW2024]

If it was mine, I’d remove the 12v -ve terminal from the Aux Battery. AFAIK You will only lose volatile data such as profile and settings you’ve set up /changed as everything would go back to default on reconnection, as they would if you changed the Battery anyway. 
I’d also seek advice with the servicing dealer master tech just to be on the safe side in case there’s a quirk I/we are not aware of. 

[dash]

I wonder if the dealer puts power on the jump start terminal before replacing the Battery to prevent data loss

[HarryW2024]

24 minutes ago, dash said:

I wonder if the dealer puts power on the jump start terminal before replacing the battery to prevent data loss

Probably so as to preserve your data, this however is more akin to bringing a new car to life on first switch on. Hence my suggestion speak to a Master tech to make sure you’ve got the bases covered. 

[jthspace]

Yaris Cross loses keyless entry and says refer to dealer, but a few cycles and it reset OK.

[jthspace]

On 10/23/2024 at 11:59 AM, dash said:

I wonder if the dealer puts power on the jump start terminal before replacing the battery to prevent data loss

You can buy an OBD plug with 2 Battery clips to attach to a 12v Battery in the footwell whilst you remove the 12v Battery under the seat.

eBay

Google Search

[hind]

But you have to match the voltages as close as possible before connecting it to OBD? 

[anchorman]

To disconnect the Battery you need to really yank the rear seat up.  I leave my car on a CTEK charger while I’m away which is easy because it’s right by a socket in the garage.   So there are solutions but I think the easiest solution is to buy the attached jump pack for forty quid, go on holiday and forget about the car.   Chances are it will start when you get back but if it doesn’t you can pop the bonnet and attach your jump pack and then it will.  You also got that jump pack for future use.   Keep it under the passenger seat or in the glove box in case the Battery does go flat or at least where you can reach it in the boot from the back seat because the boot won’t open if the Battery is flat.  

[Dala]

He starts the car with a jump pack and immediately goes to buy a new car Battery.  I understand he's looking for another solution.

[anchorman]

19 minutes ago, Dala said:

He starts the car with a jump pack and immediately goes to buy a new car battery.  I understand he's looking for another solution.

Are you responding to me because if you are I haven’t a clue what you are getting at.  

[Dala]

That wasn't a reference to anyone. Just a statement of what's going to happen.

[hind]

Yeah, it's better to prevent the damage to the Battery. Jump starter is an emergency tool, not the solution to the actual problem. 

2 hours ago, anchorman said:

Chances are it will start when you get back

69 days? OEM Mutlu Battery? Chances are 0% 🙂 

[Cyker]

If it's in a garage a trickle-charger is a good idea. Turning off the keyless entry system will save a lot of power, but not enough, I suspect, to get to 60+ days!

[hind]

29 minutes ago, Cyker said:

Turning off the keyless entry system will save a lot of power

If it's even possible without visiting the dealership or using Carista (or similar) app, as 9" Smart Connect have no such option and some of the 2021 YC were equipped with it IIRC.

[anchorman]

Many are left for over 60 days without problems but the trouble is it isn’t consistent.  I suppose it depends on the SOC at the time of shutdown and ambient temperature etc.  

[hind]

8 hours ago, anchorman said:

Many are left for over 60 days without problems

How do you know? 

[anchorman]

5 hours ago, hind said:

How do you know? 

How do you know you can’t?  There are tens thousands of these things in the country but you only know about the ones on here and many of them are only here because they are investigating this very issue.  I know someone who’s been laid up with an eye operation and the car was left outside more than 60 days.  She’s never had a problem with it and there will be more.  I know several people that leave them for at least a month then do the same again after a trip to the shops.  I flattened my mate’s LBX in maybe 40 minutes with just the interior leds on.  Like I said, very inconsistent.  

[hind]

I've seen many cases where it didn't start after much shorter period. I have never seen a case where Yaris IV would sit that long with oem Battery and start after 69 days. That's solid enough to not encourage someone to try that because he will damage the Battery in the process. And of course you personally won't pay for the replacement, will you? 

[Yaris_Cross]

1 hour ago, hind said:

I have never seen a case where Yaris IV would sit that long with oem battery and start after 69 days.

There is no way i would leave a Toatoa hybrid 60+ days with whichever version of the 12v Battery it had installed without having some sort of external power supply fitted.

I would ask the OP if they have a family member or neighbour they could trust to sit in the car in ready mode a couple of times a week to keep things topped up.

[anchorman]

8 hours ago, hind said:

I've seen many cases where it didn't start after much shorter period. I have never seen a case where Yaris IV would sit that long with oem battery and start after 69 days. That's solid enough to not encourage someone to try that because he will damage the battery in the process. And of course you personally won't pay for the replacement, will you? 

You’re missing my point that it isn’t consistent so therefore I couldn’t agree to pay for it because I wouldn’t know whether it was one that went flat after a long or short time.  What you are alluding to is that none could possibly start after 60 days and I dispute that.  The problems really start to appear when you have situation like Covid where cars were repeatedly left for such long periods.  

7 hours ago, Yaris_Cross said:

There is no way i would leave a Toatoa hybrid 60+ days with whichever version of the 12v battery it had installed without having some sort of external power supply fitted.

I would ask the OP if they have a family member or neighbour they could trust to sit in the car in ready mode a couple of times a week to keep things topped up.

So would I ordinarily but if I went on holiday and either forgot or some event like a volcano brought me back after 65 days rather than 21 for example I’d be optimistic that it would start and not one iota concerned if it didn’t.  We’re talking about a £75 Battery.  If the £4000 transmission had a chance of irreparably failing through lack of use after 60 days that might be a different matter.  I’m not losing sleep over such things.  I’ve got a Lexus with a slightly bigger Battery than the Yaris for a slightly bigger engine and there are folk on the US forums that report flat batteries.  My concern over it is zero.  There are cars with conventional systems that might well fail in less than 60 days, just go in a dealership, you often see Battery chargers hooked up.  

[Yaris_Cross]

10 hours ago, anchorman said:

We’re talking about a £75 battery.  If the £4000 transmission had a chance of irreparably failing through lack of use after 60 days that might be a different matter

We are talking about a £25,000+ car you shouldn't have to worry about it not starting because its been left 60 days (or a couple of weeks in a lot of cases) you also shouldn't  have the worry  the Battery going flat may have caused damage and could lead to further problems.

 

Quote

 There are cars with conventional systems that might well fail in less than 60 days, just go in a dealership, you often see battery chargers hooked up.

I think you are clutching at straws 

[hind]

10 hours ago, anchorman said:

 What you are alluding to is that none could possibly start after 60 days and I dispute that.

Yes, this is certain, unless some super extraordinary conditions occur. Suggesting that it might not happen is deceptive and will cost the person who follows your advice. 

10 hours ago, anchorman said:

We’re talking about a £75 battery

Funny that here it's only 75 quid Battery but you don't consider the time needed for the replacement and environment factors of producing another dangerous garbage which has to be taken care of with another resource consuming process, while in other topic you insist that emission saving start-stop mechanism (also causing the Battery to fail faster) should be mandatory.