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Discussion Starter · #22 ·
I took a picture of the battery in my 2020 RAV4h Limited:
Green Vehicle Flight instruments Gadget Aircraft


I don't see any obvious markings to indicate if it is an AGM or not. The part number is obscured by the metal strap. I looks like it is 540 CCA.
 

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In an ICE vehicle there is usually some warning (reduced starter speed) when battery is reaching end of life, charging problem or higher than normal parasitic load while off. A hybrid has no warning, it either enables run mode or it doesn't. This may take days, weeks or months to manifest itself depending on what is causing the degradation. When this happens it is obviously important to fix the problem with a TSB, disconnect parasitic drain such as camera, etc. but it also important to test battery to determine it's health. If this discharge problem occurred over a day or two and battery did not discharge dangerously low then it may recover with a good charge. Anything longer or lower and the battery is toast! While changing battery types or capacity to obtain better discharge recovery capability or increased capacity, doing so will only delay the problem, not fix it.
 

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The gas XLE and other gas models DO have the auto stop/start. They have what is known as an EFB (enhanced flooded battery). This is merely a flooded lead/acid battery with a completely sealed top so you do not need to add distilled water and indeed you can't open them to do so. They are not that different from earlier batteries and are pretty cheap. The AGM is completely different and superior to an EFB of the same size -- they have many more CCA (cold cranking amps) and are shock and vibration resistant. That's why they are used for racing and off road. Probably the hybrids have EFBs like the gas models. I do not know. Can someone confirm?
EFB's have thicker plates and a heavier construction in general to allow deeper discharge levels and multiple start cycles in quick succession.

The batteries in both the Toyota hybrids we have at home are sealed lead acids but they are not AFB's.
 

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In an ICE vehicle there is usually some warning (reduced starter speed) when battery is reaching end of life, charging problem or higher than normal parasitic load while off. A hybrid has no warning, it either enables run mode or it doesn't.
...
Note.
2020 - 2021 MY RAV4 HV [01/2020 - ]
CONSTRUCTION
(a) An EN (European Norm: European Standards)-compliant and open type battery is used for the auxiliary battery, and it is installed under the luggage compartment.
(b) A battery room ventilation hose is provided to effectively direct gas generated by battery electrolysis out of the vehicle.

Battery State Sensor Assembly
Detects the charge/discharge current, voltage, temperature, SOC (State Of Charge) and self-diagnosis result of the auxiliary battery and sends signals to the hybrid vehicle control ECU.
SYSTEM CONTROL
(a) Basic Control
(1) Controls the output voltage of the hybrid vehicle converter assembly (DC-DC converter) in accordance with changes in the target SOC to change the SOC of the auxiliary battery to reduce the power consumption.
(b) Constant Voltage Control
(1) In the following situations, basic control is temporarily suspended and constant voltage control is performed.

  1. A certain period of time has elapsed since the power switch is turned on (READY)
    1. In order to compensate for electricity consumed due to parasitic current when the power switch is off, constant voltage control is performed for a certain period of time after the power switch is turned on (READY).
  2. Stable operation of certain electrical components is required
    1. The state of certain electrical components is monitored, basic control is temporarily canceled and constant voltage control is performed when the system determines that operation of the electrical components may become unstable.
  3. Stable use the auxiliary battery
    1. Constant voltage control is performed and the auxiliary battery is fully charged every 20 driving hours to minimize deterioration of the electrode plates due to sulfation.
    2. Constant voltage control is performed when the SOC of the auxiliary battery is low or the temperature of the auxiliary battery is high/low to minimize deterioration of the auxiliary battery.
    If need then is available this method of start
 

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I took a picture of the battery in my 2020 RAV4h Limited:
View attachment 173192

I don't see any obvious markings to indicate if it is an AGM or not. The part number is obscured by the metal strap. I looks like it is 540 CCA.
That is a completely different brand and type of battery than is used in the 2021 gas models. MY gas XLE has a "Clarios" brand battery with large sealed cell caps on top . That 84 month warranty would indicate it is a top of the line battery. I don't know--is it actually an AGM?
 

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It appears Toyota is going cheap now on their batteries like other mfg. The OEM battery on my 2010 FJ Cruiser is a panasonic and at 12 years of age still has full voltage and going strong. You can't even buy that battery now in the US.
 

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Discussion Starter · #29 ·
Update: I finally got around to taking my car in. They verified that the TS-B-0095-20 had been applied, and that the battery tested our ok. At least this is what they told me.

So, no definite solution for me from this problem. Maybe, since I replaced the battery (with my own money) after the last time it died, I will not see this again.
 
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