Hybrid Battery Test

NiMH

Lexus RX 450h / RX 450hL (4th gen) Hybrid Battery (2016-2022)

The Lexus RX 450h / RX 450hL (4th gen) Hybrid Battery (2016-2022) is the high voltage battery in the Lexus RX 450h (2016-2022), Lexus RX 450hL (2018-2022).

At a Glance

Specifications

ChemistryNiMH
Nominal voltage288 V
Modules30
Module voltage9.6 V
Coolingair (cooling intake filter in cabin; maintenance guide calls for cleaning)
LocationCabin floor pan cross member under the second-row seats, concealed by fabric covers

Cars That Use It

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-011-D.pdf, 2026-10-07)
    • The 2020-2022 RX 450h Warranty and Services Guides schedule a periodic cleaning or inspection of the HV battery cooling intake filter as a maintenance item. (assets.sia.toyota.com: L-MMS-21RX450H.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 2016 RX 450h Warranty and Services Guide lists the hybrid battery under the Hybrid System Warranty for 96 months or 100,000 miles, while the 2020, 2021 and 2022 RX 450h/RX 450hL guides add a separate Lexus Hybrid Battery Warranty of 10 years or 150,000 miles from the in-service date, whichever occurs first. (assets.sia.toyota.com: L-MMS-20RX450h.pdf, 2026-10-07)

    How battery warranties work.

    Get This Pack Tested

    Do not open it yourself. The pack can hurt you with the car switched off.

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    How to test a hybrid battery safely

    Sources

    1. techinfo.toyota.com: L-DM-011-D.pdf
    2. techinfo.toyota.com: L-ERG-017-D.pdf
    3. lexus-cms-media.s3.us-east-2.amazonaws.com: 2021-Lexus-RX-450h-Specifications-FINAL.pdf
    4. fueleconomy.gov: 37107
    5. fueleconomy.gov: 44438
    6. assets.sia.toyota.com: L-MMS-21RX450H.pdf
    7. assets.sia.toyota.com: L-MMS-16RX450H.pdf
    8. assets.sia.toyota.com: L-MMS-20RX450h.pdf
    9. assets.sia.toyota.com: L-MMS-22RX450h.pdf
    10. web.archive.org: 2021-Lexus-RX-450h-Specifications-FINAL.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.