Tesla is working on a “million mile” battery for its future electric cars, cheaper and capable of holding more energy insiders claim, and which could help turn the automaker into a power company in its own right. The batteries are expected to launch first in China, as another way for Tesla to drive down the price of the Model 3, its most affordable car.

Currently, the Model 3 is offered with three battery options in the US, ranging from a 50 kWh pack through to a 75 kWh version.
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