Tesla batteries are stored on the floor of the car. The casing and modules are locked in place using special tools and equipment. This is why it is best to use a Tesla Authorized Repair Shop to service your Tesla. A Tesla Repair Shop has technicians who are specially trained, using tools provided by Tesla, to replace and repair a Tesla lithium-ion battery.
The battery remains the most expensive part of the vehicle. Removing and replacing a Tesla module or battery can take as little as a few hours, depending on what has happened. If you have been in a collision and the bottom of the car has been damaged, then your repair could be more complex.