Posted by: @djibattworkshop

Connect black crocodile to 8.42v electrode of Cell 3. 

Connect red crocodile to 11.78v electrode of Cell 3. 

No need any extra wires. 

 

Hi

I do as your description, it charges it (see the photo)

I should charge first group 3 cell for how long ?

Then I will charge second cell of group 3 for how long ?

Thanks

 You did not follow recommendations about current limiting and charging the cell in CV mode what is not safe for lithium cells. Switch the power supply to CC mode and set current to 0.5A. 

Posted by: @macfix-fr

I should charge first group 3 cell for how long ?

Until current drops to 0.05A. 

Posted by: @macfix-fr

Then I will charge second cell of group 3 for how long ?

No. It is connected in parallel with main cell and charged simultaneously. 

@djibattworkshop 

Hi

I set CC mode

I charged the battery it displays 517 A and CC LED lights up

Is this correct ?

THANKS

Posted by: @macfix-fr

Is this correct ?

yes. Continue charging untill current drops to 0.05 A. 

@djibattworkshop Hi After 2 hours of charging, power supply LED displays C.V (see photo). It's normal ?

Yes. Lithium cells use CV-CC charge method. After CC stage is completed CV stage begins. Charge considered finished when CV stage continued untill Taper current is reached. 

@djibattworkshop

Hi
I finished charging up to 0.5A, tested the battery with NLBA (see photo), it marks Cells Balance: Poor Balance. I managed to charge the battery 100%.

I can put the battery on the Macbook Pro 13 A1502 to check, if it sees the battery ?

I have a question, how do we know how to charge the battery up to 0.5A?

THANKS

Posted by: @macfix-fr

I finished charging up to 0.5A,

there is misunderstanding about charge current and taper current 

me recommend you to visit Battery University portal to get familiar with lithium cells basics 

Posted by: @macfix-fr

it marks Cells Balance: Poor Balance. 

because balance was not finished 

also you did not check self discharge rate like was adviced 

ignoring these steps could cause battery issues later on 

Posted by: @macfix-fr

I can put the battery on the Macbook Pro 13 A1502 to check, if it sees the battery ?

it is recommended to complete balancing first 

Posted by: @macfix-fr

I have a question, how do we know how to charge the battery up to 0.5A?

by ammeter observation 

@djibattworkshop 

Hi 
After 2 days charging with 0.50 A, the battery has completed balancing.

Thank you very much djibattworkshop

Posted by: @macfix-fr

After 2 days charging with 0.50 A,

normally there is no need to balance so long 

another tip to make balance much faster is to charge lagging cell slightly higher that other. 

in this example Voltage trimmer should be set to 4210...4230 mV instead of 4200, especially if the cell has increased self discharge rate 

@djibattworkshop Hi

I set DC power supply 4.23 vol to charge group 3.

Thanks for information

Posted by: @macfix-fr

@djibattworkshop 

Hi 
After 2 days charging with 0.50 A, the battery has completed balancing.

Thank you very much djibattworkshop

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