Toyota / Primearth EV Energy (Toyota-Panasonic JV)
Toyota Hybrid Gen4 NiMH
Nickel-metal hydride (NiMH) cells from Primearth EV Energy · 1.6 kWh total (0.8 kWh usable) · used in 4 model variants.
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
Battery-Related NHTSA Recalls
Recalls affecting battery, charging, electric propulsion, or thermal-event systems on vehicles using this pack, as of the last complaint-data run. Each campaign names the model generation it was filed against; the summary gives the model years covered.
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2021-2022 RAV4 Prime and 2022 Lexus NX450h+ plug-in hybrid electric (PHEV) vehicles. The electric current rectifying module contained within the DC-DC converter may have been damaged during production, which can result in an electrical short-circuit.
Consequence: A short circuit can cause the DC-DC converter to overheat, increasing the risk of a vehicle fire.
Filed against: Toyota RAV4 2019-2020
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2021 RAV4 Prime Plug-In Hybrid vehicles. During certain cold weather driving conditions, while driving in EV Mode, the hybrid vehicle control engine control unit (HEV ECU) software may cause the hybrid system to shut down if the accelerator is rapidly pressed to further accelerate the vehicle, resulting in a stall.
Consequence: An engine stall increases the risk of a crash.
Filed against: Toyota RAV4 2019-2020
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2022 Prius and Prius Prime vehicles. The Engine Control Unit (ECU) software may falsely detect an error and shut down the hybrid system, causing a loss of drive power.
Consequence: A loss of drive power increases the risk of a crash.
Filed against: Toyota Prius 2016-2022
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2013-2015 Prius and 2014-2017 Prius V vehicles not included in recall 18V-684. Excessive voltage in the Intelligent Power Module (IPM) within the inverter may cause the hybrid system to shut down, causing the vehicle to stall while being driven.
Consequence: An unexpected hybrid power system shut down may increase the risk of a crash.
Filed against: Toyota Prius 2016-2022
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2018-2019 Prius C vehicles. The DC-DC converter may fail resulting in the auxiliary battery no longer receiving power from the converter, which may cause a loss of drive.
Consequence: A loss of drive increases the risk of crash.
Filed against: Toyota Prius 2016-2022
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2016 Prius vehicles. A capacitor within the hybrid system may not have been properly bolted to the inverter housing.
Consequence: If the capacitor was not properly secured, vibrations from driving the vehicle may damage the capacitor, shutting down the hybrid system, causing a loss of motive power and increasing the risk of a crash.
Filed against: Toyota Prius 2016-2022
For TWD editorial coverage of major recall campaigns, see /recalls/.
Frequently Asked Questions
What chemistry is the Toyota Hybrid Gen4 NiMH?
The Toyota Hybrid Gen4 NiMH uses Nickel-metal hydride (NiMH) chemistry. Cells are supplied by Primearth EV Energy. Cell format: Prismatic NiMH cells, modular pack. Pack architecture: Compact pack under rear seat or trunk, air-cooled (cabin-fed).
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 Hybrid Gen4 NiMH 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 Hybrid Gen4 NiMH?
Toyota Prius 2016-2022 (AWD-e grades (2019-2022) and Prius One / Two (2016-2018); other grades use lithium-ion); Toyota Camry 2018-2020 (Hybrid SE / XLE (Hybrid LE uses lithium-ion)); Toyota RAV4 2019-2020 (Hybrid (Toyota lists lithium-ion from 2021)); Toyota Highlander 2020-2025 (Hybrid trim).