Riddle me this: What is the weight of the 40 and 60 kWh battery packs?

Riddle me this: What is the weight of the 40 and 60 kWh battery packs?

I have seen different posts online about this - everything from "the weight is proportional to the range" to "the 40/60 kWh versions have weights added for the missing batteries" to the 40/60 kWh use lower capacity batteries so the weight is the same." Does anyone really know?. I am hesitant to pay $20K for extra range. If the 40 kWh battery is about half the weight of the 85 the efficiency would be better, and it would help me be more comfortable with the lower range. My commute is 3 miles each way, and for $20K I could accept using our other car for road trips.

Tâm | 17 March 2013

I certainly do not know the battery weights. I assume the heavier the battery is, the less efficient it would be.

However, I bought the heaviest one for the range. I bought the Models S specifically because of its ability to do long road trips.

I used to drive very little with my Prius: 900 miles /month.

Now, I have driven 8,200 miles in almost 3 months. I have been taken advantage the 5 CA superchargers for trips from Las Vegas, NV to Oakland, CA for both fun and business.

It is well worth the money. It is an amazing machine so the price is so cheap for its capability. The loan rates are so low in

so why settle for less?

L8MDL | 17 March 2013

I would think the batteries weigh about the same for the sake of chassis stability and control. Any significant difference would require changes in suspension and increase cost.

Longhorn92 | 17 March 2013

This is the only post I have seen that specified curb weights for the 85 kWh and 60 kWh cars ( There is supposedly a 183 lb difference. Who knows if it's accurate.

Docrob | 17 March 2013

The most onerous effect of a major weight change would not be a suspension retune its that they would have to repeat the crash and safety testing regimes and have each model completely recertified. The costs associated with such a requirement would be huge as would be the delays it would entail.

Mike90266 | 17 March 2013

Thanks for replies. I goofed with thread title. What I am really wondering is: Are the lower range cars inherently more efficient because the batteries contain fewer cells and weigh less? The 85 kWh has 42% greater capacity than the 60, but only 27% greater range (265 vs 208 miles per EPA). If I don't often need the extended range it will help me accept the lower range of the 40kWh battery - and lack of Supercharging :( - if I know that I am going further per kWh due to the battery weighing a few hundred pounds less. This may account for the disparity noted above. I even live within 6 miles of a Supercharger, but MS 40 is going to be a challenge for my wife to accept already. Adding $12-20K for a better battery and Supercharging privileges when we have kids' college expenses upcoming is not likely going to work.

Mike90266 | 17 March 2013

Thanks Longhorn. That's exactly the type of reply I was hoping to receive. It's an interesting question because of the structural role of the battery assembly and the implications of fewer cells on crash data, as has been noted.

paulehardy | 17 March 2013

Sounds like the 40 might be right for you, not based on efficiency, but based on cost and your willingness to use another vehicle for road trips. A supercharger 6 miles from your home is of no use as presumably you will always leave home on a full charge.
Good luck with your decision!

Chuck Lusin | 17 March 2013

Remember that the 40 does not have the SuperCharging capability. If the 40 gets say only 125, you still could made 20 round trips on your commute! Plus you would be able to charge from a standard 120V outlet, 6 miles, would take 1 hour and 18 min.

Jeff Miller | 18 March 2013

"Are the lower range cars inherently more efficient because the batteries contain fewer cells and weigh less?"

You would expect them to be and based on the data collected so far they are. 60s are roughly 10% more efficient than 85s.

Battery Wheels Wh N Miles
1 60 19 330 8 12359
2 85 19 362 21 58859
3 85 21 370 15 49365


for details.

FLsportscarenth... | 18 March 2013


In my last year of high school my dad bought a new car for himself... He told his friend who questioned the timing of his purchase "I worked in a tyre store to pay for my tuition and that is real hard work - he can work in some easy retail job, that is the problem with this generation, they are so bloody lazy and expect everything to be handed to them..." Needless to say I worked minimum wage crap jobs to pay tuition, books and fuel money though undergraduate school, in graduate school I was able to find paid professional internships. My father did not charge me rent, could eat at home for free and loaned me money to buy my first car (yeah I did pay him back for that too).

I used to be jealous of all those spoiled kids who's parents hocked the house to pay tuition for them or got a car as a graduation present. But years after I reaped the rewards, I knew the value of money and learned to never waste it, even small amounts of it. I really owned my education so never skipped class and got the best grades I could (magna cum laude). I left with my BA and MA and NO debt and a lot of work experience on my resume. Having tasted minimum wage poverty I knew I had to become a success and had a iron will to accomplish my goals (but not as strong as the iron will of my fathers mother who only survived the Nazis in Poland because they had gold from scraping and saving to buy their survival and escape to freedom), yes money can save your life...

So think carefully about your planning, is spoiling the kids really such a wise idea? You worked hard to earn that money should not you be rewarded? Getting a 60 khw with SC will be a real replacement for a ICE car, not just a in town car and will actually pay for it self in fuel and repair costs in 8 - 12 years.

Go 60! California has good state universities and can commute... Living on campus rarely helps a students grades, but often leads to a party lifestyle...

Mike90266 | 19 March 2013

Thanks FLsportscar. Great story, and congratulations for your success. I'm in my 13th year with a first-year Prius and would so love to have a Model S. I would be a little nervous leaving in my work parking lot. One of my colleagues just got a CL 55 AMG, and it was keyed within two weeks. Your feedback about going for the 60 was supported by someone I just saw yesterday who works for Tesla. He told me the 60 was the one he get. With the SC option, 19s, pana roof, air suspension that brings the price to about $70K. We'll see...

Hills | 19 March 2013

This country need more people with your values!

Hills | 19 March 2013


FLsportscarenth... | 12 April 2013

@Mike and Hills

Thanks for your positive comments... Just found this thread again with volkerize.


Hope you get your 60 with SC and Pano soon! I would not go with air susp due to durability problems with similar systems in Mercedes of my friends, maybe Tesla's are better? But I would not spend extra for it. My advice is go with the options you really want and keep the car for 20 years... it will pay for itself.

Warm regards to all!

GeekEV | 12 April 2013

I'm surprised nobody has addressed the OP's question yet, now that we know. Since this thread has been resurrected, I'll put it out there... Now we know that there really are no 40's, but software limited 60's (and the 40 line has been canceled) the answer is obvious - they weight the same. ;-)

Brian H | 12 April 2013


GeekEV | 13 April 2013

Oops. Typo. :-)

carlk | 13 April 2013

To answer the other half of the question 60kWh, and now 40kWh too, weighs about the same as 85kWh. It uses the same battery pack as 85kWh only that some cells are replaced with dummy cells. Tesla save cost this way since they won't need to have two different suspension designs and go through separate safety certification process.