Li-ion
Lexus RX 450h+ Plug-in Hybrid Battery (2024+)
The Lexus RX 450h+ Plug-in Hybrid Battery (2024+) is the high voltage battery in the Lexus RX 450h+ (2024-2025+).
At a Glance
- Li-ion chemistry
- 355.2 volts nominal
- refrigerant cooled
Specifications
| Chemistry | Li-ion |
|---|---|
| Nominal voltage | 355.2 V |
| Cooling | refrigerant (A/C compressor supplies refrigerant to HV battery coolant routes when cooling is needed, per DM) |
| Location | Cabin area under the rear seat, concealed by carpet covers (DM L-DM-018-D) |
Cars That Use It
- Lexus RX 450h+ 2024-2025+ PHEV, AWD; EPA 37 mi electric range Run the checklist
What Goes Wrong
Reported failures, each from a source listed below, as of October 7, 2026.
Symptoms
- The Lexus dismantling manual says a ground-fault monitor watches for high-voltage leakage to the metal chassis while the vehicle is running; if it detects a fault, the master warning light comes on with a hybrid system warning message on the display. (techinfo.toyota.com: L-DM-018-D.pdf, 2026-10-07)
Same Electrical Spec
These packs share this one's chemistry, voltage and module count. That is a spec match only. It does not mean the parts fit each other, so check with a technician.
Warranty
Lexus's 2024 and 2025 RX 450h+ Warranty and Services Guides list a Lexus Hybrid Battery Warranty of 10 years or 150,000 miles from the in-service date, whichever occurs first, with other hybrid system components at 8 years or 100,000 miles. (assets.sia.toyota.com: L-MMS-24RX450h.pdf, 2026-10-07)
Get This Pack Tested
Do not open it yourself. The pack can hurt you with the car switched off.
Sources
- techinfo.toyota.com: L-DM-018-D.pdf
- techinfo.toyota.com: L-ERG-045-D.pdf
- techinfo.toyota.com: L-ERG-057-D.pdf
- lexus-cms-media.s3.us-east-2.amazonaws.com: 2024-RX-450h-Spec-Sheet_FINAL_NEWSROOM.pdf
- pressroom.lexus.com: electrifying-an-icon-the-2024-lexus-rx-450h
- fueleconomy.gov: 49159
- assets.sia.toyota.com: L-MMS-24RX450h.pdf
- assets.sia.toyota.com: L-MMS-25RX450h.pdf
Last updated October 7, 2026. Failure and recall notes are as of that date. Spotted a mistake, or speaking for a maker? Report an error.
Hybrid Battery Test is independent. It is not affiliated with, sponsored by or endorsed by Lexus. Names and part numbers are used only to identify the vehicle and the part.