Blog posts related to Batteries

Tesla battery degradation: This is what real data tells us

March 11, 2020

In this guest blog post by Ramin, the creator of the Stats app for Tesla, uses real data to throw some light to common Tesla battery degradation questions. TL;DR: There is nothing to be worried about in the vast majority of cases.

Past Tesletter articles

'I would say it's safe to assume the Model 3 battery is fire-proof'

Yaro_S, a reddit user that rebuilds Teslas, took these pictures of the battery of a Model 3 that hit a pole at 60mph. By now, we all know that Teslas are less likely to catch fire than normal ICE vehicles, but even more so the Model 3, according to Yaro_S. «None of the cells combusted. There is one that looks like it got to a very hot temperature and started to melt but did not burn.» I find that remarkable, given the damage shown in the picture.

Read more: Reddit

From issue #71

110 kWh packs and 400+ range coming for S and X?

Jason Hughes discovered some interesting bits buried inside the Tesla BMS firmware. Tesla has made changes to fit 108 cell groups and there is a ‘packid’ that states that the pack can be ~109 kWh.

Potentially, these changes come from removing the modules that as Elon stated, make an enclosure, in an enclosure, in an enclosure, and get back some space.

Read more: Twitter

From issue #99

Bjorn Nyland thinks fast-charging accelerates Tesla Model 3 battery capacity fade 📹

In this video, he compares his 6% drop to another Model 3 with similar mileage, but less frequent DC fast charging and found out that those lost only 4% of the initial capacity.

See more: YouTube

From issue #117

Concerned about your battery degradation?

Battery Compare is an iOS app is brought to you by the creator of StatsApp, the app helps you understand how your current battery and car configuration compares to cars with the same characteristics and mileage.

See more: Apple Store

From issue #86

Germany forces all petrol stations to provide electric car charging

Germany has recently announced they’re planning on forcing petrol stations to provide electric car charging as well. They are committed to making the EV numbers go up and they are starting by trying to reduce range anxietyanxiety- they have identified that 97% of the reason why people aren’t buying electric cars is range anxiety. Germany is also planning on investing 2.5 billion euros on battery cell production and charging infrastructure.

Read more: Reuters

From issue #115

Hidden source code shows a new 'Tesla credit' section on the referral program page

It’s unclear what this hidden section is, maybe they extended the referral program to give folks credit to expend on Tesla services, maybe something else.

Read more: Reddit

From issue #93

How Tesla batteries work with PhD scholar Ravindra Kempaiah

Sean Mitchell did a terrific interview to Ravindra Kempaiah. This almost two hour long interview covers topics from how to make batteries to the process of manufacturing battery cells. The interview is full of interesting material but if you are interested in a particular part of the process, Sean did the amazing job of including titles and links to the different sections of this video in the description. Thanks Sean for the great content and for making it easy to browse!

From issue #62

How Tesla’s next-gen battery will change the game using Maxwell’s technology

Great in-depth explanation about what was the technology that Maxwell was working on and how Tesla could use it to revolutionize batteries.

Read more: Tesla

From issue #96

How battery temperature affects performance


  • Colder battery = less regen, power and slower charge
  • Lower SOC = faster charge / better regen if cold
  • High SOC = less regen / charge speed even with a warm battery
  • Charging to 80% vs. 90% daily might be worth it just for the slight regen increase at lower temperatures
From issue #100

M3 AWD also available on standard battery

Elon recently confirmed on Twitter that the Model 3 AWD will also be available on standard battery. Woooot?!

Read more: Reddit

From issue #21

Model S 70D and a Model S P85+ comparison and battery degradation 📹

Both Model S have over 100,000 miles in the odometer and their battery degradation is only 3-4% in the case of the 70D and around 8% in the case of the P85+. Not bad! The video compares these two ‘vintage’ models in terms of how well they’ve aged.

Read more: InsideEVs

From issue #115

Model S battery degradation data

According to data published by Marteen Steinburg the degradation rate is 1% / 50.000km and on average, the batteries have 91% remaining at 270.000 km (170,000 miles).

Read more: Blog post

From issue #4

News for the Model S and the Model X

Greentheonly discovered a few bits pointing to new hardware coming to the Model S and the Model X imminently:

  • Two new battery types in several configs, no word about the capacity yet
  • Integrated inductive phone charger (Qi)
  • New charge port type
  • New suspension version, not a new suspension but an iteration in the one released a few months ago
  • New lumbar support, maybe new seats?
  • Is there an interior redesign coming? Who knows 🤷‍♀️ But it seems that the S and the X are getting some love for sure!

Read more: Twitter

From issue #96

Pack sizes and available kWh

wk057’s investigation into the Tesla firmware revealed these as the actual pack sizes:

Pack Total capacity Usable
Original 60 ~61 kWh ~58.5 kWh
85/P85/85D/P85D ~81.5 kWh ~77.5 kWh
90D/P90D ~85.8 kWh ~81.8 kWh
Original 70 ~71.2 kWh ~68.8 kWh
75/75D ~75 kWh ~72.6 kWh
Software limited 60/60D ~62.4 kWh
Software limited 70/70D ~65.9 kWh

Read more: TMC Forum

From issue #8

Precondition battery

Winter is coming and with that some rough times for batteries. Here are some tips from Tam about Teslas and cold weather.

Read more: TMC Forum

From issue #27

Tesla Gigafactory 1: Panasonic ready to ramp up battery production to 54 GWh

Tesla is expected to start producing Model Y and Semis in 2020. With that, plus Model 3s and a bump on Tesla energy, they’re going to need all the batteries they can produce. If this is true, GF1 will be going from 35 GWh to 54 GWh, which is a lot.

Read more: Electrek

From issue #92

Tesla Gigafactory VP opens up about battery production

Tesla’s Gigafactory in Nevada is currently only 30% and is already a 1.9-million-square-foot building with 5.3 million square feet of operating space on three floors. Tesla currently produces there as many batteries as the rest of the world production combined and this is key to achieve Tesla’s mission to accelerate the world’s transition to a sustainable energy and transport system. Here is an interesting interview with their VP of of Operations at the Tesla Gigafactory.

Read more: Evannex

From issue #66

Tesla Model 3 Lithium Ion 21700 / '2170' cells put to the test

Testing the internal resistance, rapid charging rate, and discharge capacity of Tesla Model 3 lithium ion cells (batteries) «2170» / 21700 made by Panasonic.

From issue #104

Tesla Virtual Power Plan

A couple of Tesla Energy Engineers, Colin Breck and Percy Link, explore the evolution of Tesla’s Virtual Power Plant and talk about how Tesla’s Autobidder software and Energy platform are designed to solve the bigger problem.

From issue #112

Tesla battery degradation: This is what real data tells us

Ramin from @StatsTeslaApp has written this article about battery degradation backed with real usage data collected from his Tesla Stats App. He frequently gets questions like «My Tesla is only x months old and I am concerned about losing y% of range during this short period of time» and «If this rate of range loss continues, my range will be half of what it is now very quickly», so he wanted to share what’s really going on after looking at the data.

Thank you, Ramin, for sharing your insights!

Read more: Tesletter

From issue #102

Tesla battery longevity

The creator of the Stats App has written an article about battery longevity, here are some interesting bits:

  • The degradation is typically more pronounced when the car is new and it levels off as the car gets older
  • Battery capacity measurement is inherently noisy
  • Fluctuations in max rated range are normal

Read more: Medium

From issue #93

Tesla battery researcher unveils new cell that could last one million miles in ‘robot taxis’

Big news on the battery longevity front. A research partner has released a new paper on a battery cell that could last over one million miles. Elon has stated in the past that the drive unit is designed, tested, and validated for one million miles of operation but that they may need to replace some modules of the battery pack to get to that since it should last between 300,00 and 500,00 miles. Jeff Dahn - the lead researcher and someone that we featured in the past - and his team have been extensively testing these cells and they think - based on the results - that a new type of battery could power an electric car for over 1.6 million kilometers or 1 million miles.

Read more: Electrek

From issue #76

Tesla makes changes in the software that allow a maximum battery size to 205 kWh

Previously, Tesla’s software was coded in a way that the maximum battery size possible was 104kWh. Now, after an update and giving it one more bit, it can go up to 208kWh. While this doesn’t mean that Tesla is going to release a car with a battery larger than 208kWh, I think it’s more than possible that it will release one with a battery larger than 104kWh in the next months.

From issue #119

Tesla new low-cost, long-life batteries in Model 3 MIC later this year

Tesla plans to introduce a new low-cost, long-life battery in its Model 3 in China later this year or early next that it expects will bring the cost of electric vehicles in line with gasoline models, and allow EV batteries to have second and third lives in the electric power grid. Tesla is not just a car company, it’s an energy company, and this is yet another great move by Tesla in that direction.

Read more: Reuters

From issue #112

Tesla rolls out improved Model S/X battery thermal management software

After a recent fire in Hong Kong, Tesla is releasing an improved battery thermal management for the Model S and Model X as a precautionary measure. While fires in Teslas happen, we have to remind ourselves that a fire in a Tesla is ten times less likely to experience a fire than a gas car.

Read more: Teslarati

From issue #60

Tesla's 'Roadrunner' project aims to achieve a $100 per kWh battery cell

Crossing the $100 per kWh would allow electric vehicles to reach price parity with ICE vehicles. Tesla also looks to bring its battery cell production in-house and enable rapid mass production. The plans are for these new battery cells to make it to the vehicles first, and they would allow them to achieve a longer range without using more batteries. Not sure how this project will interact with Tesla’s plans to soon release a 110 kWh battery pack with over 400 miles, we shall see.

Read more: Tslatimes

From issue #101

Tesla's battery pack - Technical explanation

Three part video series in which SavageStormAir explains the core of the Tesla’s battery technology, the battery pack.

From issue #5

Universal battery pack coming to Model 3/Y soon

What does ‘universal’ mean? Basically, Tesla is going to update the Model 3 production lines in the US passing on the Model Y battery manufacturing improvements and eventually incorporating the Model Y heat pump in the Model 3 as well. No timelines have been shared yet.

From issue #122

[Video] Model 3 battery and BMS signals

Very nerdy video about the Model 3 (and Y) battery pack while looking at the signals that explain how the BMS thinks.

From issue #109