Hyundai

Hyundai Sonata Plug-in Hybrid 9.8 kWh pack (2016-2019)

Lithium-ion polymer (nickel-cobalt-manganese) cells from Hyundai Mobis (LG Chem cells) · 9.8 kWh · used in 1 model variant.

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Pack reference

Lithium-ion polymer (nickel-cobalt-manganese) · Hyundai Mobis (LG Chem cells) · 360-volt pack, 96 cells in 12 modules

About the pack

Capacity

9.8 kWh

as published

EV-only range

—

limited data

Warranty floor

—

see OEM warranty book

Pack overview

ChemistryLithium-ion polymer (nickel-cobalt-manganese)

Cell supplierHyundai Mobis (LG Chem cells)

Cell formatNot published

Voltage (nominal)360 V

CoolingAir (cabin-fed)

Architecture360-volt pack, 96 cells in 12 modules

Warranty 10 yr / 100k mi

Known issues

High

NHTSA 18V-166 (March 2018) covers 2,840 Sonata Plug-in Hybrids from 2016 to 2018, built from July 31, 2015 to August 31, 2017. The hybrid battery can swell during charging and discharging and trip a voltage protection switch, and if that happens in electric mode the car can lose drive power. Dealers replace the switch with a new battery management module free of charge. Hyundai changed the part in production in late August 2017.

NHTSA recall

Low

Hyundai's 2018 and 2019 spec sheets list a 3.3 kW on-board charger, with a full charge taking 2.7 hours on a 240-volt supply and 8.7 hours on 120 volts.

Manufacturer spec

Low

Hyundai's 2017, 2018 and 2019 warranty booklets cover the hybrid battery for life for the original owner, defined as the first retail buyer, and for 10 years or 100,000 miles for later owners. On 2019 cars certified as transitional zero-emission vehicles, the later-owner term is 10 years or 150,000 miles in California and nine other states.

OEM warranty

Low

Hyundai's EPA certification filing describes 12 modules of eight cells, 96 in all, at 360 volts and 27.2 amp-hours, cooled by cabin air pulled through the pack by a fan.

Manufacturer

Low

Hyundai told dealers in April 2019 how to diagnose power relay assembly and safety plug fault codes on 2016-and-later Sonata Hybrid and Plug-in Hybrid cars. It is a service bulletin, not a recall.

TSB

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 / 100k 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

Hyundai Sonata

2016-2019 · Sonata Plug-in Hybrid only

27-28 miEPA electric range

99MPGe

3.3kW · AC charger

Full reliability page →

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.

18V166000 Mar 12, 2018 HYBRID PROPULSION SYSTEM

Hyundai Motor America (Hyundai) is recalling certain 2016-2018 Hyundai Sonata Plug-In Hybrid vehicles. These vehicles are equipped with a Voltage Protection Device (VPD), designed to protect the high voltage battery module, that may activate inadvertently.

Consequence: If the VPD activates while the vehicle is being operated in Electric Vehicle (EV) mode, there may be a loss of power, increasing the risk of a crash.

Filed against: Hyundai Sonata 2016-2019

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

Pack family

Hyundai Sonata Plug-in Hybrid 9.8 kWh pack (2016-2019) is part of the hyundai-sonata-hybrid family. Related packs:

Hyundai Sonata Hybrid lithium-polymer pack (2011-2012) · Lithium-ion polymer (manganese spinel) · 1.4 kWh
Hyundai Sonata Hybrid lithium-polymer pack (2013-2015) · Lithium-ion polymer (manganese spinel) · 1.43 kWh
Hyundai Sonata Hybrid 1.62 kWh pack (2016-2017) · Lithium-ion polymer (nickel-cobalt-manganese) · 1.62 kWh
Hyundai Sonata Hybrid 1.76 kWh pack (2018-2019) · Lithium-ion polymer (nickel-cobalt-manganese) · 1.76 kWh
Hyundai Sonata Hybrid pack (2020-2025) · Lithium-ion polymer (nickel-cobalt-manganese) · 1.62 kWh

Frequently Asked Questions

What chemistry is the Hyundai Sonata Plug-in Hybrid 9.8 kWh pack (2016-2019)?

The Hyundai Sonata Plug-in Hybrid 9.8 kWh pack (2016-2019) uses Lithium-ion polymer (nickel-cobalt-manganese) chemistry. Cells are supplied by Hyundai Mobis (LG Chem cells). Cell format has not been disclosed. Pack architecture: 360-volt pack, 96 cells in 12 modules.

What is the warranty on this pack?

10 years or 100,000 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 Hyundai Sonata Plug-in Hybrid 9.8 kWh pack (2016-2019) battery warranty runs 10 years / 100,000 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 Hyundai Sonata Plug-in Hybrid 9.8 kWh pack (2016-2019)?

Hyundai Sonata 2016-2019 (Sonata Plug-in Hybrid only).