Hyundai

Hyundai Sonata Hybrid lithium-polymer pack (2011-2012)

Lithium-ion polymer (manganese spinel) cells from LG Chem · 1.4 kWh · used in 1 model variant.

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Pack reference

Lithium-ion polymer (manganese spinel) · LG Chem · 270-volt, 95.9-pound pack in the forward part of the trunk

About the pack

Capacity

1.4 kWh

as published

Service life

10 yr

100k mi typical

Warranty floor

—

see OEM warranty book

Pack overview

ChemistryLithium-ion polymer (manganese spinel)

Cell supplierLG Chem

Cell formatFlat stacked polymer cells (Hyundai calls them prismatic)

Voltage (nominal)270 V

CoolingAir (cabin-fed)

Architecture270-volt, 95.9-pound pack in the forward part of the trunk

Warranty 10 yr / 100k mi

Known issues

Medium

The battery warranty differs between the two model years. The 2011 Sonata Hybrid carries 10 years or 100,000 miles on hybrid system components. For 2012 Hyundai added a lifetime battery replacement guarantee for the original owner, which does not transfer and excludes leased and commercial cars.

Manufacturer

Low

Hyundai gives the pack as 1.4 kWh and 95.9 pounds, with lithium-polymer cells developed with LG Chem on a manganese spinel chemistry. It is air-cooled: a duct draws cabin air through the rear package shelf.

Manufacturer

Low

Hyundai's 2011 warranty booklet limits hybrid system coverage to 10 years or 100,000 miles and has no lifetime battery term.

OEM warranty

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

2011-2012 · Sonata Hybrid only

36combined mpg

Full reliability page →

Pack family

Hyundai Sonata Hybrid lithium-polymer pack (2011-2012) is part of the hyundai-sonata-hybrid family. Related packs:

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 Plug-in Hybrid 9.8 kWh pack (2016-2019) · Lithium-ion polymer (nickel-cobalt-manganese) · 9.8 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 Hybrid lithium-polymer pack (2011-2012)?

The Hyundai Sonata Hybrid lithium-polymer pack (2011-2012) uses Lithium-ion polymer (manganese spinel) chemistry. Cells are supplied by LG Chem. Cell format: Flat stacked polymer cells (Hyundai calls them prismatic). Pack architecture: 270-volt, 95.9-pound pack in the forward part of the trunk.

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 Hybrid lithium-polymer pack (2011-2012) 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 Hybrid lithium-polymer pack (2011-2012)?

Hyundai Sonata 2011-2012 (Sonata Hybrid only).