What charge level do you typically store your lithium ion batteries at?

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Bort
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What charge level do you typically store your lithium ion batteries at?
0%
0% (0 votes)
1-20%
0% (0 votes)
21-40%
0% (0 votes)
41-60%
18% (9 votes)
61-79%
8% (4 votes)
80%
4% (2 votes)
81-100%
43% (22 votes)
I just recharge when needed
8% (4 votes)
I always top off all my batteries to full (inside and outside lights)
18% (9 votes)
I have no clue since i don't check charge levels (please explain in thread)
2% (1 vote)
Other (please elaborate in the thread)
0% (0 votes)
Total votes: 51

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Edited by: Bort on 03/03/2022 - 17:46
Bort
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I just got me my first 21700s, i try to store my batteries at 80% and realized this would be 4000mAh which would be higher than any fully charged 18650 (they are 5000mAH batts).

Hence inspiring this thread.

The Journal of Alternative Facts

"It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

 

Bort
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Also does this differ for your batteries stored outside your lights?

The Journal of Alternative Facts

"It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

 

tactical_grizzly
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The capacity and percentage of capacity is irrelevant for me because they vary from battery to battery. I just pay attention to voltage.

For cells that will be used again within a couple weeks, I charge them to 4.2V when they’re empty. They then stay with my flashlight stuff until I need to swap in a fresh cell.

For cells I don’t plan on using for more than a few weeks I (dis)charge them to 3.65V because I heard that’s best practice somewhere, lol.

RichH
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New Li-ions usually arrive charged to 3.8v and need to go on the charger to 4.2v, unlike Lipo that are at full capacity from new. My guess from this is that’s ideal storage voltage as it seems the same across all the manufacturers.

I don’t have a storage voltage, but I don’t let them drop much under 3v and prefer to keep them topped to capacity. mAh is just the size of the can, like tactical_grizzly, I don’t go on that.

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Usually I try to leave the cells somewhere between 3.5V and 3.9V, except the ones in lights I use daily. Those get charged to about 4.1V and discharged to about 3.3V, very approximately, but it tends to take at least a few weeks per cycle, and often more like a few months.

For infrequently-used lights, it usually takes years before I need to charge it… even if I keep the voltage within a fairly narrow 3.5-to-3.9V range. Since I usually only want 5 or 10 lumens, batteries last a very long time per charge.

Basically the only time I ever fully charge or fully discharge a cell is when I’m running tests.

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For deep storage, I usually do it at 3.4-3.5V.

For normal storage, 3.9V.

If I expect to use it, 100% charge until I get/make a charger that can set different SOC levels.

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I fully charge my batteries and keep them in my flashlights. I don’t have any spares.

After when I use a flashlight for awhile, I top off the battery, and then start using my next favorite flashlight.

I’m not concerned about longevity of them. I have some Li-ion batteries that are 8+ years old and haven’t noticed any issues with them yet.

Compared to the NiCads of the past, these Li-ion batteries are a dream!

I’d rather use my flashlight around the house than turn on the lights.

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Most of them are kept at about 4.0v. Frequently used batteries sometimes are pushed up to 4.1 and then recharged when I know or suspect they are below 3.8v at the end of the day or use. Although people may be used to seeing a percentage on their phone, they really should be using a voltmeter. I think these poll questions as worded are doing a disservice.

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Are there any chargers that can charge/discharge to a specified voltage?

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Keep my emergency lanterns fully charged. Doesn’t do much good to have discharged batteries during a power outage.

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Anything I’ll not be using for 3+ months gets discharged down to 3.6v-3.7v and into the fridge they go.

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Azirine wrote:
Are there any chargers that can charge/discharge to a specified voltage?

Hobby chargers like the good ol’ IMAX B6 have a menu setting to charge for storage. It won’t discharge the battery on my device though, only stop at 3.7V

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Azirine wrote:
Are there any chargers that can charge/discharge to a specified voltage?

The Opus 3100 V2.2 has a hidden slide switch under the bottom cover that limits charge voltage.  It's set to 4.2v from the factory.  The other settings are 3.7v and 4.35v.  I cut a small hole in the bottom cover so I could easily adjust it to 3.7v for cell storage.  The switch is undocumented in the owners manual.  I learned about it here in a 3100 thread.

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Fully charged; topped off monthly. (usually)
I have some computer battery pulls that are over 10 years old and still work fine.

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now someone chart how much you can save {money} vs. amount of time and brain energy expended doing so

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I keep my edc light pretty well topped off. Other lights that get less frequent use I prefer to keep in the mid 3V range, but I don’t go out of my way to charge or discharge to that level. If I notice they’re getting down below the mid 3 range I’ll toss them on the charger for a little while but I may or may not pull them before they get completely topped off.

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tactical_grizzly wrote:
The capacity and percentage of capacity is irrelevant for me because they vary from battery to battery. I just pay attention to voltage.

For cells that will be used again within a couple weeks, I charge them to 4.2V when they’re empty. They then stay with my flashlight stuff until I need to swap in a fresh cell.

For cells I don’t plan on using for more than a few weeks I (dis)charge them to 3.65V because I heard that’s best practice somewhere, lol.

This is pretty much what I do too.

For storage, I am only concern by voltage and don’t care about capacity and % of capacity.

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This is a good question, as I know I’m pretty bad about this.

I tend to keep a bunch my lights fully gassed up and ready go, north of 4 v. Darkness might strike at any moment. This means the batteries in lights I use frequently get topped off a lot. I know this is a bad habit, as this is more than twenty lights and some don’t get turned on for weeks, but this is not always about being rational.

I keep a just couple of batteries fully charged outside of lights, just if I need to take a spare 16340 or 18650 with me somewhere. Batteries that I’m storing are south of 3.8 volts.

Storing all spares in the fridge is something I should probably think about. Good idea!

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Whenever I get any new cells (discrete or included with lights) I always cap-test them, so they typically go back up to 4.2V, as I don’t stay up all night babysitting them.

I might give ‘em a blast on turbo to burn off a fractional-volt or so, but that’s it.

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I just bought an EXTAR VC8 + 8 bay charger and it has a storage setting. It will discharge or charge to get to 3.7 volts. I have several chargers but I am kinda digging this one as it does it all. Hope this helps

Lots of lights ........................

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Azirine wrote:
Are there any chargers that can charge/discharge to a specified voltage?

Not sure if any others already mentioned, but the SkyRC MC3000 specifically allows to do that, even allowing other charging parameters (like the charge current and end-charge/termination current, which also affects the charged voltage a bit). Although the MC3000 is a much more expensive charger.

One can set up to what voltage the battery gets charged to, or when discharging, up to what voltage (in 0.01v increments)
Or when set to “storage” mode, the charger will then charge or discharge up to the user-specified voltage.

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Usually around half charge. I only usually fully charge cells if I am going to be using a light for a few hours. Otherwise its a quick charge at my desk.

Would you mind keeping the wrong flashlight?
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86250rrippin wrote:
I just bought an EXTAR VC8 + 8 bay charger and it has a storage setting. It will discharge or charge to get to 3.7 volts. I have several chargers but I am kinda digging this one as it does it all. Hope this helps

Are you sure it has a storage setting, I cannot find that anywhere.
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gottawearshades wrote:

Storing all spares in the fridge is something I should probably think about. Good idea!

yeah you could spend hours doing that and save 23 cents when the light lasts 3.3 weeks longer than otherwise

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Lots of interesting replies.
I try to make my batteries last as long as possible since i can’t afford to replace them.
I guess if that was not a concern i could just store everything fully charged. It would certainly be easier/less work to do that.

I try to store batteries around 4V or 80%. Though with my new EDC (Wurkkos FC11) with integrated charging i am just fully charging it then recharging when empty a week or two later and considering it a throwaway battery when its toast.

The Journal of Alternative Facts

"It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

 

Bort
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d_t_a wrote:
Azirine wrote:
Are there any chargers that can charge/discharge to a specified voltage?

Not sure if any others already mentioned, but the SkyRC MC3000 specifically allows to do that, even allowing other charging parameters (like the charge current and end-charge/termination current, which also affects the charged voltage a bit). Although the MC3000 is a much more expensive charger.

One can set up to what voltage the battery gets charged to, or when discharging, up to what voltage (in 0.01v increments)
Or when set to “storage” mode, the charger will then charge or discharge up to the user-specified voltage.


So you can set this charger to charge to exactly 4.0V for example?

The Journal of Alternative Facts

"It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

 

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usually you cannot set charger termination voltage

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wle wrote:
usually you cannot set charger termination voltage

I knew this already Wink

The Journal of Alternative Facts

"It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

 

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% is a weird symbol to use for volts.
I only charge mine to 4.2 volts. I don’t recommend any of those other options unless you have a bunch in series.

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zoulas wrote:
86250rrippin wrote:
I just bought an EXTAR VC8 + 8 bay charger and it has a storage setting. It will discharge or charge to get to 3.7 volts. I have several chargers but I am kinda digging this one as it does it all. Hope this helps
Are you sure it has a storage setting, I cannot find that anywhere.

100% positive , I have been using this function. Its the 8 bay plus model . You must use the first 4 bays and must hold the mode button down until GRAD comes up. Then you push it one more time and STORE lights up . Will do 4 at a time for those 2 functions. All 8 bays will do IR ,CUR, CAP.

Lots of lights ........................

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