Question battery storage

[eletroenergy]

I was recommended to store Li-Po or Li-ion smartphone batteries for the long term with a charge between 3.75v and 3.80v, today I measured the voltage of the BM20 and BP-5L batteries and they are with 3.74v at this voltage. do I need to recharge again to 3.80v?

 

[Pommie]

Yes

 

[Pommie]

Probably higher.

 

[Scalamilano]

Yes

 

[eletroenergy]

3,74 is danger for battery?

 

[audioguru]

A storage charge and a sales charge on a lithium battery is 3.7V to 3.8V. How old are the batteries in stores?
Some people say that the voltage on a Lithium battery drops with age. Less than about 3V will shorten its life.
But I have the battery from my daughter's first cell phone that is about 23 or 24 years old and it still measures 3.75V.

 

[eletroenergy]

my batteries is new buy aliexpress xiaomi bm20 nokia bp5l

3,74 is danger for battery?

it's been 2 or 3 months since I charged them to 3.8v and today it's 3.74v is necessary recharger?

 

[Buk]

t's been 2 or 3 months since I charged them to 3.8v and today it's 3.74v is necessary recharger?

No.

 

[audioguru]

Battery university.com talks about battery self-discharge. They say that poor fabrication practices and a protection circuit increase the problem.
Are the batteries you bought from China real or are they counterfeit fakes?

Battery University says, "A quality manufacturer checks the self-discharge of each cell and rejects those that fall outside tolerances." Then I say AliExpress gets and sells the rejects.

 

[rjenkinsgb]

3,74 is danger for battery?

it's been 2 or 3 months since I charged them to 3.8v and today it's 3.74v is necessary recharger?

No and no.

You don't need to check them more than once a year, as long as they are not installed in anything.

[Another one to lock?]

 

[Buk]

Then I say

Proof?

Of course not. Just your prejudicial hobby horse.

 

[eletroenergy]

BM20 and BP-5L batteries are not installed in any device they are stored but checking 1x per year is it safe or can the battery drop dangerous charge before 1 year?

 

[audioguru]

It depends on the quality of the battery. You bought your battery from China so you must guess about its quality.

 

[Pommie]

You bought your battery from China so you must guess about its quality.

Must have missed that bit.

Mike.

 

[shortbus=]

Wire your batteries to the electrolytic caps and all will be protected.

 

[Buk]

Wire your batteries to the electrolytic caps and all will be protected.

More data? Research? Reference?

 

[rjenkinsgb]

More data? Research? Reference?

https://www.electro-tech-online.com/threads/electrolytic-capacitor.162411/

 

[Buk]

https://www.electro-tech-online.com/threads/electrolytic-capacitor.162411/

Ah!

 

[Nigel Goodwin]

He seems nothing but a troll, continually posting stupid pointless questions, he's banned and the thread closed!.