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Chevrolet warns the Bolt could lose 40 percent of its range in eight years

Chevrolet got the industry’s attention when it introduced the 2017 Bolt, a battery-powered compact with 238 miles of range, during the Consumer Electronics Show (CES). As the first examples head to dealer lots, a paragraph buried deep in the owner’s manual is getting the attention of prospective buyers.

“Like all batteries, the amount of energy that the high voltage “propulsion” battery can store will decrease with time and miles driven. Depending on use, the battery may degrade as little as 10 percent to as much as 40 percent of capacity over the warranty period,” warns a snippet on page 322 of the Bolt’s owner’s manual. The text was discovered by Green Car Reports.

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The warranty period Chevrolet refers to is eight years or 100,000 miles, whichever comes first. A 10-percent loss wouldn’t be alarming, but a 40-percent loss would reduce the Bolt’s operating range to 143 miles on a single charge in ideal driving conditions. That’s still more than many electric vehicles on the market — including the BMW i3 — but it’s far less than advertised.

Every type of battery degrades over time, so capacity loss is part of living with an electric vehicle. However, Chevrolet’s decision to┬áinclude the paragraph in the Bolt’s owner’s manual might have been made to to protect itself from the type of lawsuits that other carmakers have faced arising from this same issue.

Angry Nissan Leaf owners in California and Arizona filed a class-action lawsuit against the Japanese automaker after they saw their driving ranges drop drastically; one owner reported range had dropped from 100 to 44 miles in a year. A judge approved a settlement last year, and Nissan agreed to replace the battery pack in affected vehicles free of charge.

Looking through the Chevy Bolt’s owner’s manual also reveals a second, more pleasant surprise. An electric vehicle does without many of the wear-and-tear items found in a gasoline-powered car, including spark plugs, a timing belt, and an oil filter. Largely as a result, the only major maintenance the Bolt needs in its first 150,000 miles is a simple coolant flush.