CNN — 

General Motors makes a big deal out of the Ultium battery technology underpinning its new and upcoming electric vehicles like the Cadillac Lyriq, GMC Hummer EV and the Chevrolet Silverado EV pickup. But the GM EV that’s a hit with customers right now is, ironically, the Bolt, a model that was first introduced back in 2016 and that doesn’t use the new Ultium battery packs GM boasts about in its newer models.

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