3.75v is good or bad voltage for long term storage Li-Po battery? Is it necessary to go up to 3.80v or can it be maintained? i have this battery https://www.aliexpress.com/i/10050029709...4itemAdapt

A voltage anywhere between 3.7V and 3.85V is generally considered to be an acceptable storage voltage for a cell on a LiPo, so 3.75V will be fine.

^^^^+1

How often should I charge this battery if the temperature where I live is 35C?

Does any reliable study on Li-Po batteries show that the 3.7v to 3.85v range is good for storage?

Hmm. Related: In the fridge or not?

1) no fridge
2) Does any reliable study on Li-Po batteries show that the 3.7v to 3.85v range is good for storage?
3) How often should I charge this battery if the temperature where I live is 35C?

(31-May-2024, 05:57 PM)carlosff2 Wrote: 1) no fridge
2) Does any reliable study on Li-Po batteries show that the 3.7v to 3.85v range is good for storage?
3)  How often should I charge this battery if the temperature where I live is 35C?

Charge them when you fly. Any rechargeable batteries have a limited life span.

Just look at the automobile batteries. They are lead acid and supposed to be trouble free and last a long time but the warranty is getting shorter and shorter. 

So if you don't plan to use your battery leave them on your vendor's shelf. If you buy batteries, use them as much as possible and dispose of them when they go bad.

Storage charge is supposed to be good but only for storage. If you fly everyday why put them in storage. On the other hand if you fly once a month, put them in storage charge and charge them before you go fly.

Lipoly battery does not like cold weather. 35C is not bad unless you leave it out in the sun and the temperature goes higher than that on the battery.

This is a hobby. Don't over think. Enjoy instead.

I'm looking for some study on the suitable voltage range for storing Li-Po batteries

I have backup batteries and they are at 3.75v but I don't know 3.75v will discharge quickly and the battery will die at 0% and how often should I charge this battery at a temperature of 35C, once a month, once a year?

(31-May-2024, 07:40 PM)carlosff2 Wrote: I'm looking for some study on the suitable voltage range for storing Li-Po batteries

I have backup batteries and they are at 3.75v but I don't know 3.75v will discharge quickly and the battery will die at 0% and how often should I charge this battery at a temperature of 35C, once a month, once a year?

Lithium batteries have a very slow self discharge rate. You don't have to constantly charging them to keep them in storage charge.

Whether you charge your battery once a month or once a year is entirely up to your operation. If you plan to store your battery for a year I don't think you want to worry about that battery even if you put that in storage charge. I will not use that battery for anything mission critical like flying. 

Then again for some batteries I have them dated back 3 to 4 years and they are still working fine. I never bother with storage charge when I am using them more than once a month. Then there are brand new packs that puffed up in a week of use. 

So you can look for all the study you want and read all the white paper you can find. The bottom line is none will help you except yourself. You have to figure out how many batteries you plan to have and use and the purpose for their use.

Only buy enough batteries for your immediate use and no more. Don't plan on storing batteries to use in a years time and expect them to still be good.

If you buy spare batteries don't charge them. Leave them in the discharged state as they come.

I use these regularly. Sometimes everyday. I don't put them into storage charge. When they go bad which they will I just discharge them completely with some resistor and throw them away.

What is the minimum voltage and what is the maximum voltage allowed for Li-Po and Li-ion battery storage? Does any study verify this?

If I store the Li-Po battery at 3.75v, how many months do I need to recharge it before self-discharge destroys the battery? Here at home the temperature is 35C

(01-Jun-2024, 04:14 PM)carlosff2 Wrote: What is the minimum voltage and what is the maximum voltage allowed for Li-Po and Li-ion battery storage? Does any study verify this?

If I store the Li-Po battery at 3.75v, how many months do I need to recharge it before self-discharge destroys the battery? Here at home the temperature is 35C

https://intofpv.com/t-lipo-voltage-quick-chart

https://fpvfc.org/beginners-guide-to-lip...20damaged.

If in doubt Google is your friend. 

Did you read the post above or you just didn't like the answer?

Lipos goes bad by time too, its not just the use itself which does decrease their performance, dont tink they will be as good as a year befor.

The storage voltage does guaranty that you dont need to charge them until next use. Storage voltage does guaranty it doesnt self discharge under 3v byitself over time.
If a lipo does self discharge fast, it shouldnt be used anymore.

No fear, you cant do something wrong by just single storage charge and charge or check it when you like to use



I would suggest to mention your battery you like to store as dead and give it a try when the moment of use did come and compare it with a brand new pack.

Am I the only one that still keeps them in the fridge? I seem to recall that was recommended, back when I was dabbling in helis and lipos were somewhat new.

I found a couple 720mah 4s batts I didn't realize I had. They've been in the fridge for over a year, maybe close to two.My original bad luck with Crux35s left me with those unused and forgotten. They're numbered and should see so use this summer.  I'll keep an eye out for any noticeable performance loss or early degradation... I seem to recall GNB lipos coming with a pamphlet about care and storage that was surprisingly detailed.

What is the storage voltage of the 3.7v Li-Po? Is it just store in 3.8v or a voltage range? Any studies on this?

Is storage voltage always the best solution to maximize the useful life of Li-po and Li-Ion batteries that are stored unused?

(01-Jun-2024, 07:23 PM)carlosff2 Wrote: What is the storage voltage of the 3.7v Li-Po? Is it just store in 3.8v or a voltage range? Any studies on this?

Is storage voltage always the best solution to maximize the useful life of Li-po and Li-Ion batteries that are stored unused?

Wow! Did you even read any of the posts answering your questions?

Here is Snow Leopard's answer to you:

"A voltage anywhere between 3.7V and 3.85V is generally considered to be an acceptable storage voltage for a cell on a LiPo, so 3.75V will be fine."

What more do you want? A white paper? Do a Google search for extensive discussion of Lipoly batteries. There is enough information out there to boggle your mind. Over here you will only get simple, tried and true experiences from posters. NO "STUDIES".

You don't have to repost the same questions over and over again when multiple posters already answer you.