NiMH
Toyota Highlander Hybrid 2020+ (AXUH70) Hybrid Battery
The Toyota Highlander Hybrid 2020+ (AXUH70) Hybrid Battery is the high voltage battery in the Toyota Highlander Hybrid (2020-2025).
Specifications
| Chemistry | NiMH |
|---|---|
| Cell format | prismatic |
| Nominal voltage | 288 V |
| Modules | 40 |
| Module voltage | 7.2 V |
| Cooling | air-cooled; LH and RH battery cooling blower assemblies |
| Location | cabin area under the second-row seats |
Cars That Use It
- Toyota Highlander Hybrid 2020-2025 AXUH70/AXUH78, 2.5L A25A-FXS; 2025 ERG still lists NiMH Run the checklist
What Goes Wrong
Reported failures, each from a source listed below, as of October 7, 2026.
- Owner complaints NHTSA lists under the Hybrid Propulsion System component for the Toyota Highlander Hybrid, by model year: 2021: 1. These are all hybrid system complaints, owner reported and unverified, not only battery faults, as of 2026-10-07.
Symptoms
- Toyota's 2020 Highlander Hybrid Warranty & Maintenance Guide schedules an inspection of the HV battery cooling intake filter, with a visual check for dirt or dust every 5,000 miles and cleaning if necessary. (techinfo.toyota.com: T-MMS-20HighlanderHV.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
Toyota's 2020-2025 Highlander Hybrid Warranty & Maintenance Guides list a Hybrid Battery Warranty of 10 years or 150,000 miles from the in-service date, whichever comes first, with other hybrid components at 8 years or 100,000 miles. (techinfo.toyota.com: T-MMS-20HighlanderHV.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: T-DM-021-D.pdf
- techinfo.toyota.com: T-ERG-073-D.pdf
- techinfo.toyota.com: T-ERG-120-D.pdf
- techinfo.toyota.com: T-MMS-20HighlanderHV.pdf
- techinfo.toyota.com: T-MMS-21HighlanderHV.pdf
- techinfo.toyota.com: T-MMS-22HighlanderHV.pdf
- techinfo.toyota.com: T-MMS-23HighlanderHV.pdf
- techinfo.toyota.com: T-MMS-24HighlanderHV.pdf
- techinfo.toyota.com: T-MMS-25HighlanderHV.pdf
- techinfo.toyota.com: T-MMS-26HighlanderHV.pdf
- NHTSA complaints, 2021 Toyota Highlander+Hybrid
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 Toyota. Names and part numbers are used only to identify the vehicle and the part.