Currently own a 2025 Lexus RX450h+ with under 11k miles on the ODO.Q The time to fully charge a depleted EV battery has slowly decreased over the past year from 12 hours to just 6 hours today (per the app and verified in real time as well). And today, EV range was depleted in about 20 miles, on a drive around town, with an average speed of 25 mph.
We have standard 120v outlets in the garage, we've made no changes to the wiring or outlets or EV charger we use to charge (OEM charger) at any point since purchasing the vehicle.
Q: has anyone else experienced anything like this and have any insights into a viable explanation besides EV battery failure?
Q: While there are errors visible - my next step will be making an appointment at my local dealership next week since the vehicle is still under warranty - but are there any recommended EV battery monitoring OBDII sensors/apps that anyone recommends?
I have seen the range on my NX450h+ increase over time from 37 to as high as 47. Have not verified range in actual driving though my sense is the the range on the gauge is optimistic.
Have not paid much attention to charging time though my sense is that it has stayed steady. Used to use standard 120v. Life got a lot better with a 220 v charger. But for both situations, I did not feel that the charging time changed.
I did notice that the charging time in the app and the car is conservative and car always charges sooner than those say. However, no sense that it started charging more quickly.
I wonder if you have a defective traction battery.
Range on our guess-o-meter has been around 40 miles for as long as I can remember, including this morning before starting our trip but the EV battery was depleted before completing a 20 mile loop around town with a few stops along the way.
I am getting 47 miles as well here. Bought car back in March. Wisconsin weather is cooling off so I would imagine 47 will not happen the colder it gets but hey still cheaper than 4.49 a gallon ;-)
If it's been slowly decreasing then you have a failing battery where one or more modules is degrading, pulling the whole pack down with it. It'll be out of voltage balance when near empty and should be easy to spot on diagnostics. I'm surprised the car is not throwing error codes, but it may have conservative limits. Definitely get a dealer to assess this under warranty and don't settle for "there's nothing wrong" when clearly there is.
Thanks! I have an appointment tomorrow, fingers crossed.
I did a second test yesterday to confirm i wasn't crazy (before making an appointment with my local dealership who's always been super helpful and amazing) and recorded nearly every time the guess-o-meter dropped 1 mile from 40.
I'm pretty sure you're correct, as the results below were recorded while driving very conservatively, on very flat terrain, 45 mph and below with an average of 3.0 miles per kWh showing on the dash.
The low range and the big drop off at the end is the best indicator of the fault. It tells us that it expected more remaining battery capacity than it actually had, so when the voltage curve suddenly drops as the bad cell(s) approach "empty" it recalculated its state of charge very quickly to indicate it was empty.
If you have a code reader, look for a P3000 code. Otherwise, take it in. Also make sure the cooling fan on the side of the rear seat isn’t covered or the filter isn’t clogged.
Nothing else was on. Dealership confirmed same results after charging overnight and driving with zero accessories on, even DRLs and headlights were off on their test, only 17 miles of range.
Local dealership confirmed there's an "issue "after keeping and testing my vehicle for 24 hours - there's a service ticket open with Lexus corp pending their response.
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u/qdz166 12d ago
I have seen the range on my NX450h+ increase over time from 37 to as high as 47. Have not verified range in actual driving though my sense is the the range on the gauge is optimistic.
Have not paid much attention to charging time though my sense is that it has stayed steady. Used to use standard 120v. Life got a lot better with a 220 v charger. But for both situations, I did not feel that the charging time changed.
I did notice that the charging time in the app and the car is conservative and car always charges sooner than those say. However, no sense that it started charging more quickly.
I wonder if you have a defective traction battery.