General Motors

Chevrolet Volt second-generation pack (18.4 kWh, 2016-2019)

Lithium-ion (cathode not published) cells from LG Chem · 18.4 kWh · used in 1 model variant.

Pack reference

Lithium-ion (cathode not published) · LG Chem · 192 cells layered in pairs; pack assembled by GM in Brownstown, Michigan

About the pack

Capacity

18.4 kWh

as published

EV-only range

—

limited data

Warranty floor

—

see OEM warranty book

Pack overview

ChemistryLithium-ion (cathode not published)

Cell supplierLG Chem

Cell formatPrismatic, in GM's wording

Voltage (nominal)337 V

CoolingLiquid

Architecture192 cells layered in pairs; pack assembled by GM in Brownstown, Michigan

Warranty 8 yr / 100k mi

Known issues

High

NHTSA investigated 2016-2019 Volts for loss of motive power caused by the Battery Energy Control Module, which sits inside the battery pack (PE23-022, November 2023 to March 2025). GM said a failed module can cause reduced power, a no-start or a no-charge condition. In March 2024 GM extended coverage on the module from 8 years / 100,000 miles to 15 years / 150,000 miles for all 2016-2018 Volts, and NHTSA closed the investigation without a recall.

NHTSA investigation

Medium

GM's 2016 warranty text sets no capacity percentage. It says the battery may lose as little as 10% or as much as 40% of its capacity over the warranty period, depending on use, and that a replacement battery will be within about 10% of the original's capacity at the time of the repair.

OEM warranty

Low

GM cut the cell count from 288 to 192 for the second-generation pack, layered in pairs, with a revised cell chemistry developed with LG Chem.

Manufacturer

Low

GM's 2016 spec sheet lists an 18.4 kWh pack with 192 prismatic cells, a charge time of about 4.5 hours at 240 volts and an eight-year, 100,000-mile battery warranty, 10 years in states that follow California's emission rules.

Manufacturer spec

Low

For 2019 a 7.2 kW charging module became standard on the Premier and available on the LT, which cuts a 240-volt charge to 2.25 hours. The LT's standard 3.6 kW module takes 4.5 hours.

Manufacturer spec

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: 8 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

Chevrolet Volt

2016-2019 · All trims (18.4 kWh)

53 miEPA electric range

106MPGe

Full reliability page →

Frequently Asked Questions

What chemistry is the Chevrolet Volt second-generation pack (18.4 kWh, 2016-2019)?

The Chevrolet Volt second-generation pack (18.4 kWh, 2016-2019) uses Lithium-ion (cathode not published) chemistry. Cells are supplied by LG Chem. Cell format: Prismatic, in GM's wording. Pack architecture: 192 cells layered in pairs; pack assembled by GM in Brownstown, Michigan.

What is the warranty on this pack?

8 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 Chevrolet Volt second-generation pack (18.4 kWh, 2016-2019) battery warranty runs 8 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 Chevrolet Volt second-generation pack (18.4 kWh, 2016-2019)?

Chevrolet Volt 2016-2019 (All trims (18.4 kWh)).