Can you share details on the blue tooth jump starter?
a link, perhaps?

Curious how this works.

We haven’t bought yet. My bride drives her RAV4 about 30 miles round trip At least three times a week. That will continue when we get the RX. So, I’m
not too worried about the battery dying from lack of use. But, for an abnormal drain, or say… sitting at the airport for three weeks, that device might be handy.

 

Is this happening with the 2025 models. The posts seem to all be older cars.

 

https://lithiumhub.com/product/emergency-start

 

So I have NOT been trickle charging at all for last 6+ months or so. Have been driving the car regularly though for 4-5 days a week and about 150 miles per week. Never had a parasitic loss in my car's case, and the resting voltage of the 12 V battery is actually 12.3 V while driving (as visible from the voltage monitored at the rear-view mirror supply). It almost never goes below 12.3 V. It has never died since after my 26 day parked state in April 2024 - and the dealer reported the stock/factory battery is good and non-replaceable health in Dec 24. This is through the peak of winter, when the voltage drop is most vulnerable, temperature-wise.

 

12.4v is where sulfation starts in lead-acid batteries and keeping a battery below that voltage will shorten its life. That's why i put my batteries on the charger whenever they get below that.

 

Yes I know - that is the conventional wisdom and expectation. However, I'm betting on the possibility Lexus/Panasonic-designed 12 V is actually not a standard 12 V and can sustain lower voltage than 12.4 V without degradation. This appears backed by at least the fact that yours or mine, despite having multiple drops below 12 V multiple times (car going dead) actually not shown any permanent degradation when tested for it (both by your tester and my dealer) - which is unexpected for a run-of-the-mill 12 V FLA. Lexus/dealers is also not replacing the batteries unless they test as bad, for this very reason, is my guess. There is a thread in the NX forums where few incl. me had dug into the actual maker/supplier of the Lexus 12 V - which is not a standard 12 V maker, and instead one based in Japan that exclusively makes these batteries going into the Lexus/Toyota Hybrids. In other words, I'm betting that its custom-designed for at least slightly lower than 12.4 V. The same battery type exists for ALL Lexus hybrid powertrains - NX, RX, TX

And besides, I'm fine with the fact that I will either get Lexus to replace their 12 V within 4 years if it dies, OR, I will replace it with my own dime if its after the warranty expiration. I don't have any risk of getting stranded (which is what that mattered to me, practically), since that risk doesn't exist any more at all for me, after I found and hooked up the ES.

 

I'd rather see how long the battery can last with care. 7 years is about the shortest life I get out of a battery (Autozone)and I've had them last as long as 12 years(Yuasa)

 

And I would rather not have to think about the battery or its reliability, and live my life normally - which is why I chose Lexus to begin with.

I do regularly charge my traction battery - drive religiously as EV unless on long drives or roadtrips. However, I signed up for one plugin cable to take care of, when I got my plugin and not two cables 🥶

 

It's just another part of care and maintenance to me, something I've been doing for years.

 

Is there a battery monitor/meter that you can pull up on the screen?

 

The Ancel battery monitor is supported on Android Auto. I'm not aware of a monitor in the lexus base system. BICBW

 

You mention you would buy your own battery after 4 years - would a AGM or Lithium battery be the choice? I have a 5 mo old 2025 NX 450h+ and I'm having to charge it often even tho I drive it daily. PITA. I have both a battery monitor and the ER device you recommended now to deal with this but wondering why Lexus didn't at least put in an AGM battery in these vehicles???

 

If I were replacing the battery, I'd get an Odyssey AGM-47 or AGM-48(after making sure the 48 would fit as it is slightly longer)

I don't think that would resolve the issue, but maybe it would extend the time between charging.

 

WellsB, I had a rough experience with another car that I replaced the battery with an Adyssey as it drained excessive/corrosive gas - particularly when trickle-charging. They are no longer honoring warranties as they once did I learned. Ended up getting a Optima Yellowtop which has been fine. Most AGM batteries have vent-holes for this and the design of at least my NX seems to be a plastic box - making running a drain tube difficult. Anyone installed an AGM and dealt with this?

 

If Odyssey has lost it's edge recently, I would have to do a complete research endeavor again. Optima lost it's edge more than a decade ago leaving Odyssey as the only battery that truly stood out from the pack.

I'll have to look into it when I can find some time.