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BROWNSTOWN TOWNSHIP, Mich. — Mirroring what automakers hand out for powertrain warranties on conventional models, General Motors shared specifics Wednesday about what it guarantees for the battery of the Chevrolet Volt electric vehicle.

The warranty associated with the Volt's advanced, lithium-ion battery will be a standard, eight-year/100,000-mile warranty. GM believes it's the industry's longest, most comprehensive battery warranty for an electric vehicle. It's also transferable at no cost to other vehicle owners.

The manufacturer went on to highlight the Volt's comprehensive battery warranty covers all 161 battery components, 95 percent of which are designed and engineered by GM. Furthermore, it covers the thermal management system, charging system and electric drive components.

GM contends the Volt is the only electric vehicle that can operate under a full range of climates and driving conditions without limitations or concerns about being stranded by a depleted battery. It has a range of about 340 miles and is powered with electricity at all times.

For up to the first 40 miles, GM explained the Volt is powered solely by electricity stored in its 16-kWh lithium-ion battery, using no fuel and producing no emissions.

When the Volt's lithium-ion battery runs low, the automaker noted that the engine/generator seamlessly kicks in to extend the driving range another 300 miles on a full tank of fuel.

GM believes the Volt's advanced lithium-ion battery is designed to deliver the value, safety, quality, performance, durability and reliability Chevrolet customers expect. Key battery features include:

—Thermal management for durability and reliability: GM asserts the Volt is the only mass-market electric vehicle with a battery that can be warmed or cooled. The battery is designed to provide reliable operation when plugged in at temperatures as low as minus-13 degrees Fahrenheit (minus-25 degrees Celsius) and as high as 122 degrees Fahrenheit (50 degrees Celsius).

In cold weather, the battery will be preheated during charging to provide full power capability. In hot weather — what the automaker thinks is the most challenging environment for a battery — the Volt's battery can be chilled during charging. The Volt's liquid thermal management system can also be powered during driving by the battery or engine/generator.

—Diagnostics for safety and performance: GM said the Volt's battery management can continuously monitor the battery in real time for optimum operations. More than 500 diagnostics can run at 10 times per second, keeping track of the Volt's battery pack. Officials noted 85 percent of the diagnostics ensure the battery pack is operating safely, while the remaining 15 percent keep track of battery performance and life.

—Cell design and chemistry for performance and efficiency: GM indicated its selection of a prismatic cell design and LG Chem's manganese spinel lithium-ion chemistry is designed to provide long life and high power output with a properly maintained temperature. This enables better vehicle acceleration and increased regenerative braking capability for improved vehicle efficiency.

—Energy management for durability: GM believes fully charging or fully depleting a battery shortens its life so the Volt's energy management system never fully charges or depletes the battery. The Volt's battery has top and bottom "buffer zones" to help ensure long life.

GM highlighted that its engineers have completed more than 1 million miles and 4 million hours of validation testing of Volt battery packs since 2007, as well as each pack's nine modules and 288 cells. The automaker believes the development, validation and test teams have met thousands of specifications and authenticated each of the Volt battery's components.

Officials said those tests included short circuit, corrosion, dust, impact, water submersion, crush and penetration, in addition to extreme temperature swings combined with aggressive drive cycles, also known as "Shake, Bake and Roll."

"The Chevrolet Volt's batteries have exceeded our performance targets and are ready to hit the road," stressed Micky Bly, GM's executive director of global electrical systems.

"Our customers are making a commitment to technology that will help reduce our dependence on petroleum," Bly went on to say. "In turn, we are making a commitment to our customers to deliver the highest standards for value, safety, quality, performance and reliability for an unprecedented eight years/100,000 miles."

According to the manufacturer, GM's Brownstown Township plant, which began building prototype batteries in January, soon will begin regular battery production.

"We're moving fast to deliver for the customer and ensure the Volt launch stays on track," explained Nancy Laubenthal, plant manager of the Brownstown Battery Plant.

"Last August we announced the investment in the Brownstown facility and in January built our first completed battery pack. Now we are finishing pre-production batteries and soon we will begin building production batteries for Chevrolet Volts that will be delivered to dealers before the end of the year," Laubenthal continued.

Last year, GM pointed out that the U.S. Department of Energy selected 45 companies, universities and organizations in 28 states — including the automaker's Brownstown plant — to share more than $2 billion in awards for electric drive and battery manufacturing, along with transportation electrification. Nearly half of the awards are designated for cell, battery and materials manufacturing facilities in Michigan.