Toyota / Primearth EV Energy

Toyota PHEV Pack (Prime / Plug-in)

Lithium-ion (NCM) cells from Primearth EV Energy / Panasonic · 18.1 kWh total (14.5 kWh usable) · used in 2 model variants.

Toyota PHEV Pack (Prime / Plug-in)

Lithium-ion (NCM) · Primearth EV Energy / Panasonic · Under-floor pack, liquid-cooled

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About the pack

Capacity

14.5 kWh

useable · 18.1 total

EV-only range

—

limited data

Warranty floor

70%

capacity floor at 10 yr / 150k mi

Pack overview

ChemistryLithium-ion (NCM)

Cell supplierPrimearth EV Energy / Panasonic

Cell formatPrismatic Li-ion

Voltage (nominal)355 V

CoolingLiquid (glycol)

ArchitectureUnder-floor pack, liquid-cooled

Warranty10 yr / 150k mi

Capacity floor70%

Known issues

Low

RAV4 Prime is supply-constrained, not failure-prone. Long allocation waitlists from launch; field reliability data is still limited because volumes ramped slowly.

Low

Software-related charging quirks reported: occasional failure to start a Level 2 session that resolves on unplug/replug. Toyota addressed via TSB updates.

Low

Battery thermal management is more aggressive than HEV NiMH counterparts; expect minor parasitic battery drain in extreme cold from preconditioning.

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 to 70% capacity.

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

Toyota RAV4

2019-2025 · RAV4 Prime PHEV trim (18.1 kWh)

30MPGe

Full reliability page →

Toyota Prius

2023-2025 · Prius Prime PHEV trim (13.6 kWh)

57MPGe

Full reliability page →

Battery-Related NHTSA Recalls

Recalls affecting battery, charging, electric propulsion, or thermal-event systems on vehicles using this pack. Recalls are deduplicated across model variants; affected vehicles are listed for each campaign.

23V478000 12/07/2023 ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER

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.

Affects: Toyota RAV4 2019-2025

23V041000 02/02/2023 ELECTRICAL SYSTEM:PROPULSION SYSTEM:HYBRID MANAGEMENT:POWER CONTROL UNIT/MODULE (HPCU)

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.

Affects: Toyota RAV4 2019-2025

For TWD editorial coverage of major recall campaigns, see /recalls/.

Frequently Asked Questions

What chemistry is the Toyota PHEV Pack (Prime / Plug-in)?

The Toyota PHEV Pack (Prime / Plug-in) uses Lithium-ion (NCM) cells supplied by Primearth EV Energy / Panasonic. Cell format: Prismatic Li-ion. Pack architecture: Under-floor pack, liquid-cooled.

What is the warranty on this pack?

10 years or 150,000 miles, with capacity coverage to 70% of original. 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 PHEV Pack (Prime / Plug-in) battery warranty runs 10 years / 150,000 miles to a 70% capacity floor, 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 PHEV Pack (Prime / Plug-in)?

Toyota RAV4 2019-2025 (RAV4 Prime PHEV trim (18.1 kWh)); Toyota Prius 2023-2025 (Prius Prime PHEV trim (13.6 kWh)).