40 kWh battery will not be produced. It's official

40 kWh battery will not be produced. It's official

Tesla just announced :

Also being announced today is that the small battery option for the Model S will not enter production, due to lack of demand. Only four percent of customers chose the 40 kWh battery pack, which is not enough to justify production of that version. Customers are voting with their wallet that they want a car that gives them the freedom to travel long distances when needed.

The customers who ordered this option will instead receive the 60 kWh pack, but range will be software limited to 40 kWh. It will still have the improved acceleration and top speed of the bigger pack, so will be a better product than originally ordered, and can be upgraded to the range of the 60 kWh upon request by the original or a future owner.

fluxemag | 01. April 2013

Just got the email confirming the upgrade prices as stated earlier in this post. 11k battery, 2.5k supercharger at any point in the future. Standard pricing if you want to upgrade now. I'm not doing either, maybe some day if the battery deg is too bad and I need extra capacity. For now I'm just happy to have a faster car coming soon.

alfafoxtrot1 | 01. April 2013

"I'm just happy to have a faster car coming soon." - R.U. Sure TM isn't going to affix a large parachute to all 40kwh cars, removable upon payment of an upcharge?

lazyav8tr | 01. April 2013

It appears I got under the wire. The 40kw option is now shown as "No longer available". I finished all the "paperwork" on the 40kw and it was accepted before the option disappeared. Yaaahooo!!!

Earl and Nagin ... | 01. April 2013

Has anyone seen any announcements about the warranty for the software-limited 40 kWhr packs? Theoretically, they should get a lot more miles and time since they won't be allowed to discharge or charge so much. This should be a big long-term relief to the 40 kWhr owners who elect to keep the software-limitation.

georgefmoses | 01. April 2013

1) Tesla now claims that the performance of the software limited 60s will be as good as the standard 60s, i.e., a faster 0-60 speed for the 40s. Wondering how this is possible as this limited 60 is a much heavier vehicle powered by the same 40kwh source. Would seem that logically it would be a slower vehicle.

@) Why not produce ONLY a 85 kwh and use software to limit BOTH the 60s and the 40s. This would simply production even more, no?

Xerogas | 01. April 2013


1) It's not a 40kWh source, it's a 60kWh battery. The car is the same as a normal 60, but the range is artificially limited by software

2) 85kWh batteries are enormously expensive to make (and so are 60s, compared to 40s). Tesla is already losing money by selling 60s for the price of 40s, so this is a one-time deal to keep their word for pre-ordered 40s (and not to upset people who paid for 60s, who would naturally be upset if someone got the range of a 60 for the price of a 40 without paying for it).

I think it's a brilliant compromise.

danielccc | 01. April 2013

I wonder how they calculate the capacity limit for these cars.

There are two ways to do it. One is to multiply the capacity of your 60 kWh pack by 2/3. As the pack loses capacity, so does your software limited range. It would act as if you had a real 40 kWh pack.

The other way is to simply cap range at 40kWh. When new, this is 2/3 of the 60 kWh pack. But as the battery ages, your range stays constant all the way out to a 33% loss in capacity. It's as if, 500 or 600 charge cycles later, you still have a brand new 40 kWh car.

Here is the thing though. With the second method, the limit upgrade becomes useless once you get to that point.

Amped | 01. April 2013

Degradation over time will not change & will be that of the 60
Is expected to be around 1.7% a yr or about 70% after 10 years.
When charging it cycles through all of the cells (or bricks) in the battery, only the range will be limited.
It's believed that it's best to keep Lithium Ion batteries at a state of charge between 20% and 80%.
Bravo TM for taking care of the MS40 holders

I'm a 60 expecting delivery in a few weeks!

Superliner | 01. April 2013

The old bait and switch. For mere mortals who don't have 100K to drop on a car purchase let's hope GenIII is not a butt ugly 75-80 mile car that hopefully they really WILL SELL for the advertised price.

ramtaz | 02. April 2013

How would this affect the tax paid to upgrade later? What happens when new and improved technology is available and you purchased a battery replacement plan?
Many folks just want to enter the EV gallery ,their budget is limited to the 40 Model S.
The option to "upgrade" at $11000 later vs $10000 now is no different then when they first designed their model S. Then you have to pay the supercharger option of $2000 now or $2500 later.
Adding $12000 now would put the Model S out of reach for most of the 40 reservation holders.
That's why they designed their Model S as 40's.
My 40 is at $66570 , sales tax is $4141 ,, I will stay the course.