Toyota
Toyota Sienna hybrid pack (NiMH, 2021 on)
Nickel-metal hydride (NiMH) cells · 1.87 kWh · used in 1 model variant.
Pack reference
Pack overview
Known issues
How this pack ages (industry context)
Industry fleet aggregates: 2.3% average annual capacity loss across 22,700 EVs / 21 models (Geotab, 2026), and 95% range retention at 5 years on average across 30,000+ vehicles (Recurrent, 2026).
OEM warranty floor on this pack: 10 yr / 150k mi.
Public per-pack degradation curves are not available for most models. Individual results vary materially with climate, charging behavior, and DC fast-charge frequency.
Vehicles using this pack
Frequently Asked Questions
What chemistry is the Toyota Sienna hybrid pack (NiMH, 2021 on)?
The Toyota Sienna hybrid pack (NiMH, 2021 on) uses Nickel-metal hydride (NiMH) chemistry. Toyota has not named a cell supplier for this pack. Cell format has not been disclosed. Pack architecture: 288 volts, 40 modules of 7.2 volts, 6.5 Ah.
What is the warranty on this pack?
10 years or 150,000 miles. Specific terms vary by year and trim; check the manufacturer's warranty booklet for the exact vehicle.
How much does this pack degrade over time?
Industry-wide fleet aggregates show roughly 2.3% average annual capacity loss across 22,700 EVs (Geotab, 2026), with about 95% range retention at five years on average across Recurrent's 30,000+ vehicle fleet (2026). Public per-pack degradation curves are not available for most models. The Toyota Sienna hybrid pack (NiMH, 2021 on) battery warranty runs 10 years / 150,000 miles, which is the OEM-guaranteed minimum within that period. Individual results vary with climate, charging habits, and DC fast-charging frequency.
Which vehicles use the Toyota Sienna hybrid pack (NiMH, 2021 on)?
Toyota Sienna 2021-2025 (All trims (hybrid only)).