Having attempted to use the “accessories” position on several occasions (simply to play the radio while my wife went into the store) I am quite disappointed at how quickly the accessories position shut down - 10 minutes or less. Conversely, I am delighted to sit with the hybrid system on for 20 minutes or more, AC blasting, no ICE startup. As a result, I leave the hybrid system “ready”- running - even while vacuuming the car to prevent the interior lights drawing the 12 Volt system down.

Seems the 12Volt battery/system is unduly wimpy in this 5 month old car. Any other ESh owners agree/disagree?

 

I agree with you.
That’s the reason I put AGM battery.

 

Hmmm... According to the 2024 LEXUS ES300H OWNER'S MANUAL USA AND CANADA ONLY on page 151 the accessory mode power off time is 20 minutes:
Although the function characteristics are slightly different, the non-hybrid ES250 and ES350 auto power off times are the same. From page 145 of the 2024 LEXUS ES250, ES350 OWNER'S MANUAL USA AND CANADA ONLY:

 

Yeah, Ran down the battery probably 6 times in the first couple weeks of my CPO. Replaced it with a $100 AGM and haven't had an issue since (been over a year now).

 

An ES350 has a 70 AH / 592 (or 603) CCA 12-volt dc battery.
Needs to energize the IC engine starter among other things.
This will pull over 100 amps for a brief time.

The ES300h has a 60 AH / 345 CCA 12-volt auxiliary battery
that stabilizes the voltage for the electronics and powers the
accessories such as the radio, seat fans and heaters, etc.
The 245-volt traction battery energizes the initial and all
subsequent IC engine starts.

Combine higher draw electronics with a 40% lighter battery and
we get less engine off run time.

 

The stock battery in my '22 ESh died after about 6 months. It was partially my fault since I accidentally killed it once due to a wiring error when installing an amp. After recharging, it was never quite the same and would be too low to power the car enough to engage the hybrid system if going even 3 days without driving the car. Draining a lead acid battery can irreversibly damage it but I was surprised to find that just one drain of the battery pretty much destroyed it. That tells me that it was likely pretty weak to begin with.

Replaced with a Duralast Gold from Autozone with 650 CCA. So far so good.

 

[QUOTE=losiglow;11774559]The stock battery in my '22 ESh died after about 6 months. It was partially my fault since I accidentally killed it once due to a wiring error when installing an amp. After recharging, it was never quite the same and would be too low to power the car enough to engage the hybrid system if going even 3 days without driving the car. Draining a lead acid battery can irreversibly damage it but I was surprised to find that just one drain of the battery pretty much destroyed it. That tells me that it was likely pretty weak to begin with.

Replaced with a Duralast Gold from Autozone with 650 CCA. So far so good.[/QU
Have you noticed any decrease in MPG at all?

 

[quote=alextv;11774584]No. It's been over a year now. No change in MPG.

I should also add, I have a phone charger from Amazon that I installed which shows the battery voltage. This little gem right here:
It would routinely show 11.7 - 11.9V with the original battery when the car was off, but in accessory mode. Now, it never shows less than 12.2V when in accessory mode. Again, makes me think the original owner may have killed the battery a few times before I bought the car OR it was weak to begin with.

 

ive done the 10 min run down a couple times on the ES hybrid.. so that's my limit (before) while cleaning the car and listening to music. i did not want to push it beyond that. im not sure what the hybrid system would do on a low battery. probably not start? i did not want to find out!

 

Can someone help me understand the 12V battery better? I have an NX450h+, and the 12V died (could be jumped to restart it). When dead, the car essentially would not do anything electronic, like opening a door, starting, anything. I need to understand how to keep the 12V adequately charged, even though I predominantly drive in EV mode, and, unfortunately, use short trips. I gather that is insufficient to keep the 12V charged. Can I put the car in “ready” mode and just leave it for 15-20’ without actually driving it or having it in gear, and have that charge the 12V?? Some have resorted to using a trickle battery charger, but I think that should not be needed on such an expensive car!! And, for those techies who understand this stuff, if I have a gizmo that plugs into the cigarette lighter, when it shows volts when the car is running (ready mode), is that the amount the 12V battery is being charged, versus using it in accessory mode, where I hope it is showing the amount of charge available in the 12V to run electronics (I’d only do this very briefly, since I know accessory mode drains the battery rather quickly). My goal s to continue to drive in my preferred mode (EV) for short trips, but somehow be able to keep the 12V powered up enough that it won’t die on me. I’ve received inconsistent information about when the 12V gets charged: some say EV, HV, some say only HV and not EV. If I drive in EV mode but use the brake, doesn’t the traction battery get charged… and in turn charge the 12 V battery? Help me out someone (who knows how it actually works)! Thanks

 

I have found the EV pushbutton (on my 2024 ES300h) to be absolutely useless. The “smartness” of the ES hybrid system overrides this dumb button. Why have the button occupying precious console space?