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How likely is deep discharge in reality? And is it possible as a layman to see some warning signs before you enter a worst case scenario? We use batteries everyday, but it takes quite some knowledge to understand how they work actually...

So INR18650 is not a LI ION???

I did CID until acid came out of the battery and then I tried to burn the acid to make an explosion, nothing. Then I tried to put it in water, still nothing...

Great! More, please!

Nicely explained!

One of the overlooked aspects of a product using a cylindrical cell is the battery compartment. A good example is a torch or flashlight using 18650 or other cylindrical cells. It's all good and well having a cell that ruptures safely however consumer safety is still an issue if the battery compartment acts as a pressure vessel containing the gasses from a failed cell. This is why product testing and certification is important.

Thank you for the informative video. I wonder if spot welding the mandrel/spindle the anode side casing would help prevent it from being ejected. I am not familiar with cylindrical cell construction so I don't know if this would be practical. I would imagine the mandrel also assists with maintaining predictable thermal conductivities in the cell as the laminations maintain better contact with each other.

Good Video...thanks!

I need some help if you don’t mind sharing some of your knowledge. I bought some battery pack modules each with a BMS. The modules came from factory robots. I have not even opened the shipping box to measure voltages of these modules. The modules have lg m50lt lithium ion cells. I was taking a look at the data sheets online and could not find information on how to properly store them for greater than 2 years. I have been storing them in their shipping box for a little over one year now, but I’m not entirely sure if I need to discharge and then charge them once in a while. Would you be able to give me some instruction on how to preserve these cells? Thank you very much for your time and information.

Great video. But given the last statement about the dangers of trying to re-establish continuity of an activated CID, I feel like that should be in the opening statement and video title. Slightly off emphasis aside, great video nonetheless, thanks for making it.

Wow, thanks, now i know how to revieve my batteries ❤

Wow, thanks, now i know how to revieve my batteries ❤

Just found your channel today. Your information is extremely valuable and very well researched. I just built an electric motorcycle with 8,4kWh capacity and your videos do pretty much confirm my thoughts but also make me more secure in having built it the proper way. Thank you!

I reset one dead 18650 the other day. It came to life showing 2.60 volts. Charged it normally, it remained cool throughout the charge and is now still holding at 4.11 volts. Seems good.

Very educational

Dear sir, Are PTC and CTD used in Prismatic and pouch cells?

Very well explained! Looking forward to the next video. 🙂

Asking permission to use your videos for my educational videos in concerns to changes to the 2026 National Electrical Code? All my videos are nonprofit for educational purposes. Jacob Riddle Edu.

Brilliant explanation, loved it.

This is very good, thank you.

Thanks for the info! I have a fully charged battery that I accidentally shorted. I fixed the short, but the the CID tripped. I don't trust this cell for use since you said the pressure went way up meaning something weird happened to the chemistry. None of the reset videos talk much about what actually happens in the battery, just where to stick a screwdriver. I'm going to try to reset the CID (outdoors, with PPE on) so I can discharge it for safer recycling.

Hello. We are making a battery powered (Li-Ion) device at work. The original design assumes that the device goes to sleep when it is not used, however it can never be completely turned off and it always drains the battery. How big of a problem is that in your opinion?

If I fully discharge a battery and I let it just sit somewhere forever in a fully discharged state. Is this dangerous? Or is it, the RECHARGE after full discharge that is dangerous? I can only pick up hints from this video and other sources online that is actually the activity of recharging which is the dangerous part, yet y'all keep saying "deep discharging is dangerous". Is this just sloppiness on your end or is it really the act of depleting all energy from a battery that is dangerous (in my uneducated, yet logical brain, this doesn't make much sense lol)?

Superb and most needed to be acknowledged containt...!! Rightly said that there are numerous videos showing revival of such batteries those have become unchargable due to overcharging induced gas formation leading to disruption of cap contect. This kind of videos should always be made awailable with all languages support like few movies, as Manny unfortunate, poorly literate users or utubers , then will have advantage of your knowledge sharing...Thanks a ton friend.

I've been safety testing cylindrical lithium ion cells for some time. I just want to add my 2 cents. While the safety mechanisms are there to prevent thermal runaway, there is no guarantee that they do. I've overcharged cells that have had both the CID open and have vented but still go into TR. The threat is still there. Having one cell in the middle of a pack with already elevated temperature is the worst situation. The surrounding cells will prevent the suspect cell from cooling and increasing the risk of TR. In our systems we are counting on the charger system, mechanical system and monitoring systems to prevent these things but we still have returns from the field because this. It pains me to see people building power walls in their homes because I know it only takes one cell in a batch 3000-4000 to turn the house into a smoldering mess. Chinese manufacturing is still suspect. Please be careful and understand all the safety issues surrounding these cells. Edit: Watching people pry at the tops of the cells with a screwdriver and/or other conductive tool is just crazy. This can cause the CID to touch the collector thereby reconnecting the current path. Please don't do it....!

Excelent explanation! It was very clear, will look for the SEI video

Hi. Thank you so much for your video. I had the same questions you answered. I tried very delicately to pry the nickel tabs off of the negative side of the battery. And no matter what method I seemed to use, being as gentle as I could possibly be, I always seemed to leave a tiny pin size hole on the flat negative bottom side of the battery. Hearing a quick hiss and a sweet smell. I stopped trying to remove nickel tabs from the negative side and just cut them down as close as I can. But I always wondered about that quick hiss and sweet smell. Is it you opinion that this was part of the CID protection or electrolyte or lithium or something else? I always see people man handling these when prying off these nickel tabs with plyers screwdriver etc. And wonder how many have had the same experience and just ignored it. Thank you so much for your time and thoughts.

Thanks for your efforts to make these videos!

Moses, that's scary stuff. I know electronics but the hidden dangers of the electro-chemical reactions, watched a few of your videos. When batteries go low usually think of low potential energy but the Anode rises. Now I understand so much. There is so many idiots with little understanding on UA-cam, and UA-cam encourages the idiots to get views. I had a look on Odysee for you, not there. Thanks You Moses.

thoughts on why Sony is using 26-58 bar (377-841psi)? @4:50 It seems like quite a high pressure for an intentional vent

Just found your channel. Very interesting! Looks forward to see more from you!

Thank you, For sharing knowledge on such an important topic.

Such an inspiring video! May I please ask a question about the figure at 1 min: why there is a sudden voltage drop when the current becomes -3.4 from 0 (start of safe discharge)? Thanks for your time!

well prepared and quite informative video. congrats.

Great Explanation!! But we had a scenario of a 48V 15Ah NMC pack which went in to deep discharge by keeping it Idle for several days and OCV is around 9V. Then we tried to charge at 1A , then slightly increased to 5A when it reaches 16V . But thermal runaway happened at 28V . What could be the major reason in this?? Any clues

Thank you from Turkey

Your videos are top notch. Pls, provide us with more knowledge.

Activating CID is crazy crazy idea.

Thank you! Very informative. I thought there will be tone of videos about types Lithium cells on YT but there are few and yours is the best.

So what about cell balancing in electric vehicle? Should we deep discharge (soc 10% or lower) and the. Recharge to 100% for better cell balancing and battery health....or is this practice bad

You provide such great material to your viewers. I appreciate all of your hard work. I truly appreciate it!

very nice. i dont find these details anywhere else other than research papers.

Nice video.

Can't wait for next videos

great video👍👍👍I'm definitely subscribing

What do you do for your day job?

I just replaced the 18650 cell in a powerbank. The powerbank circuit board and other contacts were nearly pristine, but I noticed the top cap of the cell is corroded. Is this an indication that it most likely vented?

Thank you for the good information.

Thank you very much!! This video is very helpful for me~!

Amazing work. Appreciate it.