GM has awarded a production contract to A123 Systems, a developer and manufacturer of advanced nanophosphate lithium ion batteries and systems, for batteries to be used in future GM electric vehicles.

The contract includes advanced nanophosphate cells and fully integrated electronic components. The specific vehicles and brands will be announced later.

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GM battery engineers have tested and validated the A123 battery chemistry at the automaker’s global battery systems lab in Warren, Michigan.  Teams from both companies will now work on developing calibrations and software controls for the battery system in preparation for production.

This agreement builds on existing development contracts between GM and A123 focused on next-generation lithium ion battery technology at both the cell and system level.

A123 expects to build thousands or up to tens of thousands of battery packs a year for GM, A123 Systems spokesman Dan Borgasano told Reuters. The packs will be assembled at A123’s plant in Livonia, Michigan.

“GM is committed to offering a full line of electrified vehicles – each of which calls for different battery specifications,” Micky Bly, GM executive in charge of electric vehicles, said in a statement.

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