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Can my 2015 MS 70D be upgraded to 75?

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Sure, Tesla is selling batteries for ~22.5k.

If you mean the software unlock, then I doubt it. I think the 75D came out after 2015 ended (I could be remembering wrong).

I'd call Tesla and ask about your specific VIN number.
 
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Me said today a Tesla seller if a 70D is first time registered, he can no longer be unlocked to 75D.

Pretty sure that's not correct - I know that the software limited 60s can be unlocked at a later date, and I would assume the same is true for software limited 70s.

However, Tesla built real 70s for a long time before they built the software limited cars, and if the OP has a 2015, it is almost certainly actually a 70 kWh pack, with nothing to unlock.

That would mean the only way to upgrade it is to replace the pack, something Tesla has talked about a few times but had so far been hesitant to actually do.

I expect that will change in a couple years, but I could be wrong...
 
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That would mean the only way to upgrade it is to replace the pack, something Tesla has talked about a few times but had so far been hesitant to actually do.
I think that statement is a little misleading.
-They said it costs $22,500 to replace an 85kwh to a 90kwh pack.
-They said that currently they are not allowing replacing a 60/70kwh packs.

I don't think anyone in their right minds would pay $22,500 ($25,000 - $2,500 core return fee) for an extra 5kwh of range. But who knows.