NiMH
Lexus RX 350h (5th gen) Hybrid Battery (2023+)
The Lexus RX 350h (5th gen) Hybrid Battery (2023+) is the high voltage battery in the Lexus RX 350h (2023-2025+).
Specifications
| Chemistry | NiMH |
|---|---|
| Nominal voltage | 259.2 V |
| Modules | 9 |
| Module voltage | 28.8 V |
| Location | Cabin area under the rear seat, concealed by carpet |
Cars That Use It
- Lexus RX 350h 2023-2025+ AWD (FWD also listed in DM VIN table); THS (2.5L A25A-FXS) 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)
- The 2023 RX 350h Warranty and Services Guide schedules a periodic inspection of the HV battery cooling intake filter as a maintenance item. (assets.sia.toyota.com: L-MMS-23RX350H.pdf, 2026-10-07)
Warranty
Lexus's 2023 RX 350h Warranty and Services Guide lists 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; later model years were not opened. (assets.sia.toyota.com: L-MMS-23RX350H.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-043-D.pdf
- techinfo.toyota.com: L-ERG-059-D.pdf
- lexus-cms-media.s3.us-east-2.amazonaws.com: 2023-RX-Spec-Sheet_FINAL_NEWSROOM-2.pdf
- fueleconomy.gov: 46392
- fueleconomy.gov: 47149
- assets.sia.toyota.com: L-MMS-23RX350H.pdf
- web.archive.org: 2023-RX-Spec-Sheet_FINAL_NEWSROOM-2.pdf
- fueleconomy.gov: 48920
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.