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Amp Hour tracking

I would like to add tracking of charging/discharging in a new design via USB. Basically, instead of relying on tracking the voltage of batteries with an integrated battery charger, I would like to track the voltage/current to an external battery bank to track energy level. Is there a device made by TI that could be implemented to track battery levels via USB charge and discharge? The battery level could be via LED's, LCD display or via available I2C communications. ANy ideas would be great. Thanks!