12v battery maintenance, charging, etc ....

[FROSTYBALLS]

Toyota: advice on battery maintenance during lockdown or lack of use. - General Discussions - Toyota Owners Club - Toyota Forum

[Shivers]

Learned my lesson on this the hard way. Thanks for the advice.

[Jasper.]

Please can someone confirm the type of 12 volt Battery fitted to my 2021 Yaris hybrid  ?

I have been given a Noco GB40 boost starter and this is only recommended for use on lead acid batteries.

Just wondering if it's suitable if I'm ever in the unfortunate position of needing a 'jump start'..

 

Thanks...

[Cyker]

All 12v batteries are lead-acid!

Do you mean it's only suitable for flooded lead acid batteries (Can be trickle-charged) and not AGM (Really don't like to be trickle-charged; Prefer cyclic on-off charging)-type?

TBH as it's just a starter pack, it should be fine - You won't need to leave it connected for ages before trying to turn the car on as hybrids need very little current to start - Just connect it, put the car in Ready mode, then you can disconnect it again. Make sure you know where the + terminal is as it's not in the normal car place (i.e. don't rip the passenger seat apart to get at the 12v Battery!), but rather on a red covered terminal in the fuse box under the bonnet.

[Catlover]

That Noco GB 40 is more than adequate to jump start  hybrid Battery. As Cyker says, you need little power to get to the point the hybrid Battery takes over. However, £99 is a lot for a jump starter. If you want a jump starter there are plenty less priced that suits a small 12v Battery.  
My Prius has not been used for 8 days, and not a lot on the last day. Today, I put the car into Ready mode, and just sat in it for 50 minutes (with my ipad so I wasnt bored) and just let the big hybrid battery charge up the 12v battery, just as Cyker said. I Norwich it will be good for another week now.

[Catlover]

The 12v Battery you will have is an AGM type, that is Absorbent Glass Mat. There is acid in an AGM Battery but not sloshing about, hence it is a safety feature when fitted inside a cabin area of a car, which it is in your Yaris. In case the Battery bursts open, as in a crash, there is no acid thrown about seriously causing injuries.          
If you keep the 12v battery up on charge either by putting the car into Ready position as already mentioned, or use a battery charger a few times a year to take the battery slowly up to 100% charge. A CTEX 5 is a good charger to do that and more (rejuvenates as well).

[Dala]

NOCO writes that it can also be at WET, GEL, MF, EFB and AGM 

https://no.co/media/nocodownloads/format/g/b/gb40_sell_sheet_4.22.2020_1.pdf

The problem may be in the distance for NOCO cables 

 

longer cable manufacturer does not produce 
I've already contacted him

[RickyC]

There's no need to connect the negative clamp to D point.   The Battery negative is connected to car chassis so there're plenty of points that can be used for negative clamp closer than D point.

[Dala]

Toyota has a recommended point in the manual - see picture 
robo1 wrote: 
There’s are some  nuts used to anchor the shock absorber close to the fuse box.  Using a multimeter they do show they are grounded. The leads are long enough for this.

[Jasper.]

Thank you all for your replies , that was much more than I was expecting..

Really useful info.. 😊

[Roy124]

23 hours ago, Catlover said:

 However, £99 is a lot for a jump starter. 

If you have to buy it. 

[Dala]

GB40 is not needed for our cars
GB20 $ 79.95 - that's enough
Designed for car, boat, motorcycle, RV and others with gas engines up to 4 liters.
Compact but powerful lithium starter with a power of 500 A up to 20 jump starts on a single charge.
https://no.co/gb20

[Devon Aygo]

The under bonnet connections are to provide a 12v power source for starting when the cars Battery is flat, they are not for charging the cars 12v Battery charging this is to be done directly 

[bathtub tom]

43 minutes ago, Devon Aygo said:

The under bonnet connections are to provide a 12v power source for starting when the cars battery is flat, they are not for charging the cars 12v battery charging this is to be done directly 

So what's between the under bonnet connections and the Battery?

[Devon Aygo]

1 hour ago, bathtub tom said:

So what's between the under bonnet connections and the battery?

The under bonnet terminal ( AMD ) is directly connected to the DCDC converter

[Stopeter44]

So when people want to use something like the CTEX chargers that are popular here, where do they connect?

[Devon Aygo]

Directly to the 12v Battery under the (RHS) rear seat

[Stopeter44]

1 minute ago, Devon Aygo said:

Directly to the 12v battery under the (RHS) rear seat

Ok, is that easily done , or does the seat have to be removed?

[Devon Aygo]

Seat base is clipped down in two spots, carefully feel along between base and trim until you find the clip point then with hands either side of clip point pull up sharply, it is best if you can create a permanent connection to the Battery with an accessible 🔌 most charger brands offer something 

[Cyker]

Nooo, you don't need to do that in the Mk4 - They added an access panel!  

It's on the base of the rear passenger seat, on the opposite side to the fan vent for the traction Battery. (On mine it's on the driver's side but not sure if the same or reversed on the LHD models)

You need to remove two screws from the door-side of the panel, which may be a bit awkward because of the lack of space in the rear, then it's just a matter of pulling on the inner-side to pop it free of the clips.

To be fair tho', access is probably easier if you pull the seat out as access via the panel might be too tight to do anything useful without removing the Battery out of its little cubby hole first, and it's quite heavy to wiggle out!

[Catlover]

So it may be best, as Devon Aygo says, to create a permanent connection to the Battery that is easily accessible. I know that there is an accessories available to do just that for the CTEX 5 charger.

[Jasper.]

Update , I went out to start the Yaris this morning and the dash lit up but the car wouldn't start.

On looking down at my charging socket in the cigarette lighter which has a voltage display , only 7.7 volts was showing so I decided to give the Noco a go.

It was easy to find a suitable earth point close to the fuse box and within seconds the engine fired into life.

We had an appointment to get to and the Noco saved the day..

[Catlover]

Yes, as you found out it doesnt take much to fire one up, by the time you connected the portable Battery and get back to the car cockpit then its virtually ready to go. Now you got to get that Battery up to 100% and thats where something like the XTEX 5 comes in. That will slow charge up to 80% relatively quickly but to get it up to 100% could take another 8 hours or more. One feature with the CTEX 5 is that you can unplug during a charge and next morning when you reconnect the unit picks up from where you left off.

[Roy124]

Our test will be in March.  Airport valet parking.  I am certain they will have a jump start capability.  Just hope they have hybrid knowledge too 😁

[Jasper.]

Ok,  so I plan to buy a ctek MXS 5 at the weekend and the adapter kit for permanent Battery connection , I'm assuming that those of you using this set up would leave the charging cable hiding behind the access panel when not being used ?