This subject has been covered before and there are plenty that would chime in.
“I don’t care if I’m going to get 10 or 50% less cycle life”. “Batteries are cheap and I don’t need to keep them 10 years”. “I keep them full because I want to be able to use them when I need them or in an emergency”. There’s no question that they are more unstable and dangerous when “fully” charged. Plenty of people store gasoline containers and propane tanks in an attached garage or basement.
You misinterpret, misunderstand and are quick to judge.
Where did I say that I was storing them at full capacity? Letting them sit full for several days is not going to harm them. I’ve done that for many years. I have some NCR 18650A 3100 batteries that are nine and a half years old. Treated the same way.
EDIT.
For 14 years I’ve been rotating my flashlights on my nightly hikes. That means that for 4,5 6 days and sometimes longer they are at full capacity until they get used.
I have lasted anywhere from two and a half years to 9 1/2 years. Depending on the use and the power of the flashlight.
In any event they don’t cost that much. Cost had no Factor at all in my curiosity between the resting voltage differences of brand new batteries and ones that were used for years.
You clearly state that you left two sets for months and measured 4.17v. I’m not going to go back and forth. You do what you want. Your observations prove nothing.
Yes I clearly state that my older VTC5A and VTC5D we’re fully charged sometimes for a few months and not used.
Why would I put them in storage? They’re old batteries and they’ll be used like they’re being used a lot now.
They weren’t STORED! A misunderstanding by you, misinterpretation if you will. I don’t store batteries fully charged. They are stored at 3.5 volts to 3.6 volts.
Some lay around longer than others and then they’re ready when I want to use them.
It goes to show you that, unintentionally, my older batteries like the vtc5a, vtc5d,can still work well and hold their resting voltages if they’re fully charged for a week, 3 weeks whatever. Maybe they lost a couple Cycles, who cares!They are Older.
I have to add the first four and a half or five years of their life they were used consistently and taking care of and not abused.
So why are you criticizing me for leaving a few sets of OLD batteries fully charged so they’re ready for when I want to use them?
Read your posts. You contradict yourself. You do the same thing with your batteries because you want them ready and they’re not that expensive yet when I do it you preach to me and criticize and misunderstand.
Did they get ruined? They’re six and a half years old and they still work well.
It’s best that you don’t want to go back and forth. Because I could pick apart your contradictions, misinterpretation, misunderstanding and approach.
Have a good day
My Sony cells always seemed a notch above others in every way, especially Longevity. That settling of the voltage might just be the characteristic of those cells, I would be more concerned if they keep dropping the longer they sit. I have several EVO 14500 cells and for some reason they always settle around 4.13v. But that’s it, they’ll stay there for quite a long time (months)
That’s a good observation; slight differences in electrolyte composition and electrode materials can affect the “full” resting voltage.
Once all the lithium ions have intercalcated into the electrode matrix then there is no room for anymore; trying to push them in will cause heating and damage. It’s like a brawl that breaks out in a crowded tavern when all the seats at the bar are filled and they announce free beer.
The general charging protocol of CC/CV with cutoff when current drops to .1C was designed to fill most cells without regard to composition.
But if you know that the full resting voltage is less than 4.2V then there is no need to go that high during CV.
I agree 100%. I just ordered 8 X VTC5D from 18650 battery Black Friday sale. Only $4.85. My experience with those and their relatives(VTC5/VTC5A), is that not only do they perform well, they do it for a long time.
According to the gentleman,Stephen, who I spoke to on the phone they got them last September and it’s probably the last batch that they’ll get and may be the last ones Murata makes.
Molicels seem the start degrading noticeably and rapidly after 18 months, 2 years at the most. They are good for a while then they begin to lose capacity quickly.
Sony/Murata as I used examples in the beginning of my op continue to work well. Capacity is still good and the resting voltage drop is minimal even after 5 and 1/2 years.
My 30q seem to work very well also after several years.
I ordered several Samsung 50S on sale also. I look forward to getting them Monday. I’m sure they’ll do better then my P42A.More capacity and according to mooch slightly better at 10 amp and 20 amp and about the same at 30 amp. We’ll see how they do in the degrading Department.
I think it was a thread on here and what mooch may have said. Because of their high capacity and their ability to push amps pretty well, something has to give and that may be the cycle life. Time will tell.
Always been satisfied with my 30Q’s.
Purchase November 3rd 2020. Four slot medium was 3003mAh.
Today, November 26th 2022. Little more than 2 years later and 195 cycles.
Four slot median is 2705mAh.
Only 10% capacity loss. 
Compared to my Molicel P42A which Had 150 Cycles and a 15% capacity loss in just 15 months. 
I like numbers as you can see. This isn’t about money. Cells are relatively cheap ,but I like to get the best ones. Who wouldn’t?
I got my Samsung 50S today.
I’m satisfied with the capacity. I believe mooch discharges down to 2.5 volts.
My Opus goes down to 2.8 volts.
My 3 cell median is 4884mAh
Mooch test 1.
July of 2021=5119mAh. Two cell median
Test#2 on 8.10.22= 5060mAh median. Two cells.
I’m using them in my modified K1.
I hope the runtime and Longevity is better than my P42A.
The light is so powerful after 10 minutes of combined Max output the voltage is around 3.48 to 3.55 volts depending on the battery.
Very satisfied with the run time using the 50S in my K1.
I expected better run time and I got 15% more runtime than the 40T or P42A.
As mentioned prior,
the light only gets 10 minutes of cumulative Max output.
The low voltage warning came on at 7 and 1/2 minutes for 40T and the P42A.
9 minutes and 7 Seconds for the 50S. 
With that said you’re not running the light for 10 straight minutes. It would get way too high even if it was 10° Fahrenheit out. So this battery between Max output and cooling light off will last me 15 to 18 minutes. I’m sure you’re all very excited about all this!
I’m so excited about it I bought three more 50S last evening before 18650 battery stores Cyber Monday was finished.
Oh, yeahh… the only question remains, and time will tell is the longevity of this battery and how fast it will degrade compared to the others.
I have two 18350 cells from Keepower (UH1835P) that self discharge very fast. One lost 0.20v from full in 26 days and the other in 20 days. I think my cells are defective.
I would monitor if the voltages are dropping for a week. If there is significantly high self-discharge, then it would not settle. At least my Keepower cells do not.
^
That is pretty rapid. I remember I had this older, about 2 years old, Orbtronic 26650. Supposedly had that popular PLB 5500mAh cell in it.
I still have the stats on it somewhere but from a full charge it was basically down to 3.6 volts in less than 1 month.
How old are your batteries?
EDIT.
I found the info. It went from 4.23 volts on September 13th to 3.63 volts on October 26th. So that was about a month and a half it lost 0.60 volts.
Not as rapid as self-discharge as I thought but fast enough to make the battery useless and get recycled.
Yours is in a similar position almost as fast as a self-discharge. I would definitely get new ones if you haven’t already they’re not going to all of a sudden get better.
The keepowers I have is purchased on May 2021. And they did not see much use. When I first used it, I had a feeling that battery levels go down way faster than what I am used to. I thought it may be because of lower capacity (1200mAh) than 18650 cells that I normally use. I recently decided to investigate it and decided to measure voltage every day after fully charging them and I got the numbers. Interestingly battery capacity seems to be within spec, despite the high self discharge rate.
Had I known about it, I would have complained to the AliEx seller, but so many days have passed… My 18350 light is not used a lot, so I charge them once in a while. Moreover, I couldn’t find reputable cell brand for 18350 to spend my money on.
I still have these aspire batteries. I used them for about 3 years and their capacity was still good. This test was when they were brand new. That was the best 18350. Mine were the original ones that had 1,300 milliamps written on it. The ones after that which I believe were the same exact thing had 1100 milliamps on it.
When I got the Vapecell M11’s I put the Aspire 18350 in storage. I recall their capacity was as good as brand new m11s!
Almost 3 years old.
About 20 months old VS. KP!!
Wow! Seems like you accumulated a lot of capacity data! Thank you for sharing the information. I think I will look into Vapcell M11 and Aspire.
Here it is.
The Aspire were 4 years old! They had 90% of the capacity of brand new cells!
It is a shame that they stopped making that cell.
Yes I like numbers. For 12 years I have kept track of everything. Battery cycles, capacity tests, run times ect…
That’s what happens when you’re a flashaholic and have a type A personality. They seem to go together.
As I mentioned they don’t produce that Aspire cell anymore. The M11 is doing okay I’ve had it about a year and a half.
Update: Regarding the OP.
The Brand NEW GA UP BT went from 4.19V off the charger, then rested 11 days and the voltage is now 4.12V.
To me that’s unacceptable for brand new batteries. Others May disagree that’s fine. We’ll never agree on everything. Just look at the world!
Look at the other examples in my op for batteries that were several years older who fared much better after many cycles.
Going to let them go until 3 weeks total to see what I get and then return them to the dealer which he has no problem doing.
I will not categorize it as a high self-discharge. I would categorize it as an unacceptable self-discharge.
This is amazing! Beyond my expectations.
Also an unbelievable bargain. They were about $3.50 each. I bought 14 of them.
These are 4 X MJ1 UP BT. Purchased on January 11,2020. They are in my light, Acebeam K60vn.
When they were new the four slot medium was 3416mAh.
1.27.22, Two years later and 135 cycles, the 4 slot Median was 3305mAh.
ONLY 3.3% Capacity loss.
I’m going to check them again next month at that point they’ll have about 220 cycles and will be 3 years old.
Supposedly GA’s are supposed to be a little better. Not according to my experience and the hometown dealers.MJ1 have been proven to get more cycle Life by me and him.