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Upgrade to 75kWh
- Thread starter Mr So Chill
- Start date
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- Model S
SabrToothSqrl
Active Member
If I was buying today, I'd do the same thing. 60D, cash in the credits, then use the $ to make it a 75D.
T3slaTulips
Member
As long as you're not charging the upgraded battery to 100% very often the difference should be negligible.
T3slaTulips
Member
I'm sure you could do it a few ways (phone, service center, etc.) though the best (recommended?) way is through your My Tesla page. They'll change your badge on your next service visit, though the purchase itself happens through My Tesla.
Three60guy
Member
Here is my thought process.
I ordered a 70D with a physical 75 kwh battery in it. It is obviously software limited to 70 kwh. The advantage to keeping it at 70 is I can charge it to 100% each time and not effect the long term effects on battery life (confirmed by Tesla Service).
So, currently I have charging set at 100% which translates to 240 miles. But 240 miles is not actually 100% of the physical 75 kwh battery. So, I won't hurt the battery when I charge at 100% each time. If I were to upgrade to remove the software limit then I would get 257 miles or so. But the recommendation is to run the charge at 80%. They even have that nice little suggested line in the graphics to show where to do that. But 80% of 257 miles turns out to be 205.6 miles. I would have to manually charge the battery to 90% or so to protect the 75 kwh unlocked battery. 90% of 257 miles is 231 miles. I still lose 9 miles. I would have to then manually charge to 93% to get back to 240 miles for a charge. Personally, I would rather just slide the control to 100% and get 240 miles rather than mess with the details of worrying if I got 90 or 93% charge just to get what I automatically got when my battery was at 70 kwh at 100%.
Plus I get to keep $3250 upgrade charge in my pocket. WIN-WIN
I ordered a 70D with a physical 75 kwh battery in it. It is obviously software limited to 70 kwh. The advantage to keeping it at 70 is I can charge it to 100% each time and not effect the long term effects on battery life (confirmed by Tesla Service).
So, currently I have charging set at 100% which translates to 240 miles. But 240 miles is not actually 100% of the physical 75 kwh battery. So, I won't hurt the battery when I charge at 100% each time. If I were to upgrade to remove the software limit then I would get 257 miles or so. But the recommendation is to run the charge at 80%. They even have that nice little suggested line in the graphics to show where to do that. But 80% of 257 miles turns out to be 205.6 miles. I would have to manually charge the battery to 90% or so to protect the 75 kwh unlocked battery. 90% of 257 miles is 231 miles. I still lose 9 miles. I would have to then manually charge to 93% to get back to 240 miles for a charge. Personally, I would rather just slide the control to 100% and get 240 miles rather than mess with the details of worrying if I got 90 or 93% charge just to get what I automatically got when my battery was at 70 kwh at 100%.
Plus I get to keep $3250 upgrade charge in my pocket. WIN-WIN
If you charge your 70 to 100% that's actually 75 charged to 93%. If the recommendation is 80% you are already over that recommendation.
That's different than 60 charged to 100% because that's exactly 80% of the 75. I think to prolong your battery life you should charge less than 100% on your 70.
That's different than 60 charged to 100% because that's exactly 80% of the 75. I think to prolong your battery life you should charge less than 100% on your 70.
Jason Shelton
Member
Xenius
Active Member
Likely what I'll do come next February. Then again I do like the idea of being able to always charge to 100% with the 60D.
MountainRatMat
Member
You do realize your checking account number is displaying on that picture? Might want to edit your post...
jlanceho
Member
Three60guy
Member
That is true. So, I wonder why Tesla Service said it would be just fine if I did it this way?
MDMGSO47
Member
I'm a little puzzled by your logic. The 70kWh and the 75kWh battery are the same hardware except the 70kWh is software limited. The only thing that really matters is to what percentage of the total capacity of the 75kWh battery you are charging. Using your numbers, if the total capacity in miles of the unlocked 75kWh battery is 257, which is about right, and you are charging to 240 miles, you are actually charging to 93.38% of the total 75kWh unlocked capacity, which Tesla does not recommend on a daily basis. You're daily max should be 90% of the 75kWh 257 mile total capacity or 231, which is be 96% of the 70kWh capacity, not 100%.
I do agree that there is some benefit to being able to safely charge to 96% rather than 90% if you are facing daily commutes that take you to the edge of your range. However, if that is the case, you might need the 75kWh battery for the extra 17 mile range.
I never charge my S70 more than 80% unless I know I am going somewhere that requires more range and vary the percentage charge below 80% periodically.
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