Home made - Discharge Mavic Mini batteries without running the motors.

[Hegemone]

That’s because DJ I just cut and pasted it from another manual.
There are lithium ion. Read up on them
And by the way if they are Lipo (which they’re not ) don’t let him go 10 days

This info seems to state something else about li-ion storage. I learned a lot.How to Prolong Lithium-based Batteries - Battery University

 

[Deleted member 114292]

This info seems to state something else about li-ion storage. I learned a lot.How to Prolong Lithium-based Batteries - Battery University

Thank you I hope everybody reads that

 

[RogerDH]

This info seems to state something else about li-ion storage. I learned a lot.How to Prolong Lithium-based Batteries - Battery University

That article doesn't seem to distinguish between Li-ion and Li-polymer, e.g. it says "Figure 1 illustrates the capacity drop of 11 Li-polymer batteries," but the caption for Figure 1 says "Eleven new Li-ion were tested..." I'm afraid that's just adding to the confusion.

 

[Hegemone]

That article doesn't seem to distinguish between Li-ion and Li-polymer, e.g. it says "Figure 1 illustrates the capacity drop of 11 Li-polymer batteries," but the caption for Figure 1 says "Eleven new Li-ion were tested..." I'm afraid that's just adding to the confusion.

Look to figure 3. The info is corroborated a number of additional sources.

"Lithium-ion suffers from stress when exposed to heat, so does keeping a cell at a high charge voltage. A battery dwelling above 30°C (86°F) is considered elevated temperature and for most Li-ion a voltage above 4.10V/cell is deemed as high voltage. Exposing the battery to high temperature and dwelling in a full state-of-charge for an extended time can be more stressful than cycling. Table 3 demonstrates capacity loss as a function of temperature and SoC."

Corroborated here:

18650 Battery Storage - How to properly store your lithium ion batteries

Proper 18650 Battery Storage Have you ever wondered if just putting your batteries in the fridge is the proper way to store them and extend their usability? We can answer that. The recommend storage temperature for most batteries is indeed 15 degrees Celsius (hence your fridge). The lowest they...

blog.18650batterystore.com

Lithium-ion battery - Wikipedia

en.m.wikipedia.org

Derating Guidelines for Lithium-Ion Batteries

Derating is widely applied to electronic components and products to ensure or extend their operational life for the targeted application. However, there are currently no derating guidelines for Li-ion batteries. This paper presents derating methodology and guidelines for Li-ion batteries using...

www.mdpi.com

Redirect Notice

www.google.com

 

[RogerDH]

Look to figure 3. The info is corroborated a number of additional sources.

"Lithium-ion suffers from stress when exposed to heat, so does keeping a cell at a high charge voltage. A battery dwelling above 30°C (86°F) is considered elevated temperature and for most Li-ion a voltage above 4.10V/cell is deemed as high voltage. Exposing the battery to high temperature and dwelling in a full state-of-charge for an extended time can be more stressful than cycling. Table 3 demonstrates capacity loss as a function of temperature and SoC."

My point is, that article seems to consider Li-polymer to be a Li-ion cell, so it isn't clear that what was tested and what was found actually applies to 18650 cells, which is the issue that has been raised.

 

[Hegemone]

My point is, that article seems to consider Li-polymer to be a Li-ion cell, so it isn't clear that what was tested and what was found actually applies to 18650 cells, which is the issue that has been raised.

It seems more like a typo. It's constant the rest of the article. It's also constantly similar info to numerous other sources. I guess I would just need to see anything anywhere that suggest that storing at full charge is considered best practice.

 

[RogerDH]

It seems more like a typo. It's constant the rest of the article. It's also constantly similar info to numerous other sources. I guess I would just need to see anything anywhere that suggest that storing at full charge is considered best practice.

But I don't see anywhere in that article (or elsewhere on that site under the same heading) that distinguishes between Li-po and Li-ion, specifically 18650s. Treating them as the same thing is exactly the issue, and I believe the specific claim is just that storing 18650s at full charge is not as damaging as it is to Li-pos.

 

[Hegemone]

But I don't see anywhere in that article (or elsewhere on that site under the same heading) that distinguishes between Li-po and Li-ion, specifically 18650s. Treating them as the same thing is exactly the issue, and I believe the specific claim is just that storing 18650s at full charge is not as damaging as it is to Li-pos.

I added more sources to my previous post. One specifically mentions the Samsung 18650 and corroborated the article. I think they mentioned lithium polymer by mistake. They are specially referring to Cobalt based lithium ion batteries (same as Samsung 18650s) as stated in several places.

I am not trying to convince you of anything. I just can't find info that supports your position. Which was in fact the same as mine until I started to do some digging.

This is just diluting the OPs thread so I will let others decide for themselves now
that I have shared what I dug up.

 

[Dbez1]

My Nikon D7100 DSLR uses Li-Ion batteries and I keep them fully charged all the time. After 4-5 years, they’re as good as new. For convenience, I’m keeping my MM batteries fully charged.

 

[Deleted member 114292]

My Nikon D7100 DSLR uses Li-Ion batteries and I keep them fully charged all the time. After 4-5 years, they’re as good as new. For convenience, I’m keeping my MM batteries fully charged.

Same here leave them fully charged on my Nikon always

 

[Mr. Rocketman]

When 18650s are used in battery packs, they're usually spot welded. What I'd really like to see would be a battery mod that allowed you to easily pop in a fresh pair of cells. I have several DIY power banks that hold 18650s just using clips similar to those used for AA batteries.

Silver solder