Tesla (TSLA) extended the battery life of certain models for drivers in Florida so they could evacuate, it has been revealed.

Tesla shares were up 3% in early trading Monday to $353.78.

Tesla performed an automatic update on Model S/X60/60D vehicles that unlocked the full capacity of the 75kWh battery, Electrek reported. The update allowed for an extra 30 to 40 miles of driving.

Tesla used to offer the option to buy a Model S or Model X with a 75 kWh battery pack software-locked at a capacity of 60 kWh. Customers could then pay between $4,500 and $9,000 to unlock the extra 20%, depending on a the model and time of the upgrade

Tesla confirmed that it had given the extra mileage to drivers in the path of Hurricane Irma until Sept.16, after a Model S driver contacted the company saying he would need around another 30 miles of range to evacuate in traffic.

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