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Is it better to discharge a battery from SOC 80% to 20% once or from 65% to 35% twice? Thanks.

As someone dogging the hell out of my EV on ride shares, I'm testing out the theory that consuming energy between 70-30% range leads to less battery degradation (40 kWh on a Model S/about 124 miles usable range before recharging back to 70%) and using a total of 258 miles per day. I'll post the results after 5 years.

Well done India. Best wishes

I have over 10 years old laptop with over 95% SOH battery. I have limited charging to 60%, and starting of charging to 50% unless I need hours of working time. When battery was new, it was bit under 30Wh, and now it's over 27 Wh. I perform couple of times a year a balancing and capacity measurement cycle. Most of time the battery is idling between 50 and 60%. That 10% is enough to move with power on in energy saving mode or work for a while without plugging in. It sometimes goes to under 40%, but charges then only to 60%. The battery experiences full cycle or nearly empty only couple of times a year. Otherwise it's between 40 and 60% soc.

Wake up guys There here Yoshino B4000

Very interesting interview Patrick, I see that you have finally contacted Dr. Wu, since I last saw your interview with Dr. Krupp several months ago. In my opinion, Dr. Wu is an eminence when it comes to batteries, with his simple, direct way and if you doubt, he does not explain how these energy storage devices work, he is a specialist in this field. Thank you for sharing the interview, and it is a joy for me that you met him and made a great video with your guest and your friend who asked you very important questions about it. many successes spreading news about battery development. Greetings from Peru, here there is also an ecological battery model developed by a compatriot from plant pots: it is called ALINTI, which may interest you just out of curiosity. Good luck.

Super interesting interview. We have so much to learn about batteries, energy management and renewables. Kind of exciting times to be honest. 😊

Question Lithium titanate chemistry is know for having up to 20.000 cycle life And verry expensive. Do you consider this type of battery being able to have good return on investment while used in off-grid for home appliances and power for the heatpump and also charging the EV Best Regards Roland

23:56 how about "cold charging" in theory and practise ?

Beside BMS lithium ion can only take what it takes you can’t push cv or cc in each cell

Fast charging creates fractures in batteries. Nothing can be done till they build them different. Good. News they figured it out, bad news: not sure when they will put into mass scale production across all brands.

What should telecom operators in sites areas where there are no public grid?

Technology that isnt safe, should not enter consumer market. Lithium ion batteries are not safe.

Tesla fahren ist besonders effizient😊

Wrap kevlar around those cables to slow down theft.

There can be a lot of variability in battery cells. I bought 2 electric toothbrushes. One battery (Panasonic cells) died after 2 years 1 month. The second one from the same pack is still working after 8 years.

In terms of the issue around large charging cables. Why can't the charging voltage be increased such that there is less current flow reducing the physical size of the cable?

EV Manufacturers should add bigger buffer for EV batteries to avoid getting close to overcharging limits , if battery 100% charge is 4.2V make it 4.12 as maximum charge ,the same at the bottom , when lowest safe is 2.8V make it 2,88V as a lowest voltage .

When will this climate hysteria finally be over and when are we going to return to more sensible energy solutions again?

Wondering about the science about this, and if charging to 100% on an NMC battery(Ford Lightning) is damaging if you are only charging at 12 amps/2.7kW(through an offgrid solar installation). We've cut back to 80% but wonder if we really have to?

When you see the letters 'Dr' and they are not ascribed to a ....ehehe.... G.P. It's time to "listen up".

Sodium ion is better for electric bicycles compared with lithium ion: very low fire risk, robust, longer life, and very quick charge. A small battery size is not a problem unlike a car because you can peddle if charge runs out, you can stop and charge very quickly if you need to, is not damaged if fully discharged, and a small battery size makes the bike cheap.

I don’t know what the professor is saying. Here in Bangalore 95% of autorickshaws are not EVs! The same with bikes/Scooters. Till date I have not seen a Sodium ion battery based vehicles

This is why I'll always stay with ICE vehicles.

As with any commercial interest it's all about money & ultimately control. The investors expect to at least double their money so don't want to develop a technology that you buy once and it lasts a lifetime, they want a technology that you have to renew periodically which increases profit and drives further R&D. I have a calculator made by Casio with a small solar cell and I have never replaced the battery since I bought it new 40 years ago, that was not a great commercial design for calculator or battery manufacturers. Point I am making is you can be damn sure technologies already exist that could give everyone on Earth energy independence that use abundant, sustainable materials like oxygen, hydrogen, silicon, aluminium, iron, calcium, sodium, etc. These technologies can NEVER be released open source as the population would just spiral out of control... and there is the quandary. Only mediocre technologies that can easily be controlled will be allowed to develop.

If an EV were to have a type of odometer- or a log recorder stored in nondestructive / non-resettable memory showing amount of recharge KWH at a +50KW rate, number of KWH discharged while under 20% SOC, and number of hours battery pack spent at 100% SOC (for non iron phosphate packs) , this would give good metrics to amount of wear of tear. Outside of that, a 20 mile drive cycle where amount KHW delivered can be correlated to the percent of charge drop, and then compared to when the pack was new. Example: M3 LR pack is 82KWH/80KWH usable, 1% of charge is 800WH at 75 degrees F when new. A noticeably degraded cell will start delivering less WH per a percent of charge at the same temp.

Great interview, informative and useful. Thanks a lot.

The reality is not as simple as the model. Too complicated model could be misleading in decisions.

This is confusing. Okay, they agree on keeping low SoC but this tesla prof says it’s the %DoD effecting degradation, “micro-cracking” of iron oxide crystals within the battery cells occurs much more at full charge-discharge cycles. His advice was to charge less at a time at low maximum SoC to 75% max. Also, I think “plating”, when lithium gets lost, he called “dissolution”.

2:44

Cellphones should have given enough real life experience in battery behaviour

How and where any one can purchase it and the cost of the batteries.

I always trickle charge my Jaguar. BMS goes haywire if it goes under 11,5 volts. So I try to drive it as much as I can since it charges the battery during driving.

Eventually, it will all be wireless charging. Or at least for the most part. You can be 100% sure that Robo Taxi will be wireless charging. There are busses in China which already charge wirelessly at 500 KWh. Also there is very little loss. Perhaps that will improve with technology. SO the weight of the cable shouldn't be a factor for THAT much longer.

I understand the positives of the industry working together but we all know that at the end of the day if that does happen the industry will just find the best cost option and it will not necessarily push for more innovation. Competition creates innovation. Collaboration ultimately creates conspiracy based on history

I want to know about Lead acid batteries :(

Much of the digital battery twin data can is collected by a decent BMS. The voltage of each cell, over current charge, over current discharge, highest voltage cell, lowest voltage cell, back temperature, balancing, etc. So just data log that (lots of BMS units have usart, CAN, Bluetooth, and wifi.

“EVs will get to recharge as fast as gas cars, in a few years!”. NO THEY WILL NOT!!! (not in the next 7-10 years). (Maybe only for long trips, or rushed times, but not all the time, if you do care for the life/cycles of the battery!).

why do european men look and sound so weak and feminine??? must be woke virus

I came back to watch this video again but noticed the negative comment about quantum scape was removed from the older version of this video. I wonder why?

Would you be willing to share the slide show that was occasionally shown in the video?

Please explain, when the battery is charged, the cells in it are filled one after another (like communicating vessels), or when charging at 80-90%, some parts of the batteries and cells are not charged at all?

Great guest!

What about Sodium-Glass batteries?

0:34: 🔋 Understanding battery health and lifespan optimization with Professor Howey. 4:25: 🔋 Challenges in measuring battery health using models and limited parameters. 8:13: 🔋 Advancements in lithium-ion battery technology have led to improved performance and longer lifespan, especially for smartphones and electric cars. 12:14: 🔋 Factors contributing to battery degradation include SEI layer growth, particle cracking, and lithium plating. 16:09: ⚡ Factors affecting battery degradation: usage frequency, cyclic aging for daily drivers, and calendar aging for occasional users. 20:03: 🔋 Factors affecting battery capacity include algorithm changes, physical effects like ion stabilization, and potential capacity recovery over time. 24:01: ⚡ Effects of temperature on battery health and charging speed. 28:03: ⚡ Challenges in predicting battery life due to usage and population variability. 32:02: ⚡ Impact of variation in battery pack over time due to divergent behavior and limitations by the weakest link. Recap by Tammy AI

Great episode, thanks! I would love to know how the different cell chemistries should be charged for best cycle life. NMC/NCA should be between 20-80% to prolong the battery life. LFP should be charged to 100% once a week or so. But does it help also to hold it between a specific percentage to prolonged its life or does it not matter as much?

I'd rather just sit in a NIO and let battery swap manage it all, within 4 minutes.....

This gap was filled at our company starting with the first EV 2008. We for any longer had ICE and even nasty hybrids. But now full fleet of 12 are EV, we also have 11 kWh chargers at office and home and produce much of our own energy giving us FREEDOM from energy Mafia. We usually charge in 10 SECONDS and sit in an already climatized car in the morning. Super Fast charging with my car could be done in 18 minutes at 240 kWh but who cares with a range 70% around the globe never use in one day? We do up to 598 km in summer or 370 miles! So think many concepts where set up by old oil companies with stations only invented by 1925 or 25 years after the car as financial slave systems in fact that always adjusted prices before vacation periods etc. We do not need more HPC but intelligent HOME and DESTINATION chargers. We only go to hotels e.g. offering reserved garages with chargers and enjoy nice trips besides highways with much congestions in Europe. In fact we travel at good average speed and do well to our battery and own LIFE as we can enjoy an absolutely quiet ride in comfort which is unprecedented quality of drive. Most problems are only fake arguments that thinking and flexible people never ever had. when Berta Benz took the car of her husband to visit friends she had no range anxiety, needed no assurance to go 1000 km or 600 miles first and neither needed over 600 hp to claim that the car costs more than a 100 hp combustion car. So we should do everything to change the thinking of people and their prejudices created by bad intentions to follow hidden agendas. Batteries are much better than we think. My BRAUN razor, the first with LiIon has over 25 years and is still fully working and charging. Our Tesla Roadster only needed to change battery as we got an improved version in a special offer which made it a new car with all other things revised and improved. What other car company is doing that other than for some old timers of high value at astronomical prices. The Tesla costed us some 8000 USD and certainly the old battery was still with over 90% good enough for a power wall or so!😎🇨🇭

Great guest. He didn't stumble, need to BS, or get anything wrong technically..... but more importantly, always saw the bigger picture and perspective, and was able to come up with a way to convey it to laymen. So, a great engineering mind, plus a great ability to understand how to explain things to people who are not.