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Tesla Model S 85D to 100kWh battery upgrade: more range, faster charging, free Supercharging kept

Our own low-mileage SC01 Model S 85D has had its original 85kWh battery replaced with a 2023-spec 100kWh pack. Here is what the upgrade brings, and why the car keeps its free Supercharging.

personBy Gabor, MegaEV calendar_today 2 min read

Two Tesla Model S battery packs on trolleys outside the MegaEV workshop, with a grey Model S parked by the door

Our own extremely low-mileage Model S 85D received a serious upgrade today.

A ten-year-old car that looks almost new underneath

With just 35,000 miles on the clock, this car is about as close to factory fresh underneath as you will see on a ten-year-old Tesla.

The clean underside of the Tesla Model S battery pack, in almost factory condition
The underside of the car: about as clean as a ten-year-old Model S gets.

The upgrade: an 85kWh pack out, a 2023-spec 100kWh pack in

We removed the original 85kWh battery pack and replaced it with a much newer 2023-specification 100kWh pack.

The Tesla Model S on a lift in the MegaEV workshop, with a battery pack on a trolley in front of it
The battery swap under way in our workshop.

The newer pack brings three clear benefits:

  • more usable capacity, so more range on every charge
  • significantly improved charging performance compared with the original 85kWh pack
  • a newer pack, built years after the car itself
The Tesla software screen showing the car as a Model S 85D with 35,225 miles
Before: a Model S 85D with just over 35,000 miles.
The Tesla Model S instrument cluster showing Model S 100D while charging
After: the car now shows as a Model S 100D.

And it keeps its free Supercharging

This car has SC01, Tesla's code for free unlimited Supercharging. That is a valuable feature on an older Model S, and the battery upgrade keeps it.

So the result is a nice upgrade all round: more range, faster charging, and the free Supercharging still in place.

Thinking about your own battery?

Whether your Tesla's battery has a fault, or you are wondering what an upgrade could do for an older car, we can talk through the options. Our high-voltage battery diagnostics and repair service is the place to start, and our Model S 85 battery repair shows how we approach battery faults.

Send us a message with your car's model, year and mileage.

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