SAN ANTONIO – General Motors Corp. will move from the nickel-metal-hydride batteries in its 2-mode hybrid light trucks to a more powerful and compact lithium-ion technology in about three years, a key executive suggests. Li-on offers two distinct advantages for GM’s trucks: greater towing capability and more efficient packaging. Li-on battery packs portend a 50% tow-rating improvement over the present-generation hybrids launched last year as the Chevrolet Tahoe, GMC Yukon and Cadillac ...

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