With the current Hurricane Irma situation in Florida, the fine folks at Tesla thought it would be a good idea to ‘flip a switch’ on the software of those who own Teslas down there, so they have a little more range on a battery charge to get outta dodge:
Up until a few months ago, Tesla sold a 60kWh version of its Model S and Model X vehicles but the battery in those cars was actually rated at 75kWh. The thinking: Tesla could offer a more affordable 60kWh version to those who didn’t need the full range of the 75kWh battery, but to keep things simple, they’d just use the same 75kWh battery and lock it on the software side. If 60kWh buyers found they needed more range and wanted to upgrade later, they could, or if Tesla wanted to suddenly bestow owners with some extra range in case of an emergency, they could.
Source: Tesla flips a switch to increase the range of some cars in Florida to help people evacuate | TechCrunch