General Motors and Nikola Corp. on Monday announced a reworked, smaller agreement  that keeps the fuel-cell partnership intact but eliminates an equity  stake in the startup for the Detroit automaker as well as plans for  building Nikola's electric pickup truck. In September, the companies announced a deal  under which GM would supply batteries, a chassis architecture, fuel  cell systems and a factory to build the startup's proposed Badger  electric pickup in return for an 11 percent stake and $700 million.  However, the deal came into question after a short seller attacked  Nikola as a fraud, something the company denied.
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