Showing Charging Imbalance Between Cell's

Will This Battery Charge normally In Laptop AFter Getting Discharged To 0 % 

How much Imbalance Between Cell's Voltage Is Apropriate To Pickup Charge in Laptop Easily

Posted by: @r2vbatterytester

Showing Charging Imbalance Between Cell's

Posted by: @r2vbatterytester

Will This Battery Charge normally In Laptop AFter Getting Discharged To 0 % 

 Balance the cells to the minimum value so battery could be charged in laptop normally. 

Posted by: @r2vbatterytester

How much Imbalance Between Cell's Voltage Is Apropriate To Pickup Charge in Laptop Easily

 Value which does not cause Cell OverVoltage event at full charge considered maximum appropriate unbalance. It is typically 50mV for most of the batteries. Say if all cells are at 4200mV at full charge then any cell with 4250mV could cause COV event and chip will raise alarm flag. Charge will be stopped and not reach 100% value. More unbalance is earlier charge is stopped. If you observe for example charge is 93% but laptop says "not charging" it means unbalance is big and some of the cells were overcharged due to this above safety limit. 

 Reverse effect is happened during discharge. Big unbalance could produce some of the cells to be discharged faster and reach Cell UnderVoltage threshold 2.7v first. Then battery chip stop discharge to protect the cells against damage and laptop is shutdown even RSoC percentage is above 0% value. 

@djibattworkshop Thanks To Clarify !    This imbalance cause due to Cell's Resistance Imbalance Right ??

 Not only. Me recommend you to get familiar with unbalance theory to understand potential reasons of unbalance. Unbalance could be caused by following reasons 

- Different SoC of individual cells 

- Different Qmax of individual cells 

- Different IR of individual cells 

- Different temp gradient between cells 

- Different self discharge rate (SDR) 

You could not determine the reason of unbalance from a first look. Its need to carry out several additional tests. For example to let the battery relaxed for several hours ( Relaxation Test). If you observe voltage difference between cells after long enough relax it means they have different individual State of Charge. It is so called Static Unbalance and It could be fixed by balancing the cells manually i.e. injecting some charge into lagging cell or draining some energy from leading cell. It could also be fixed by external balancers plenty presentable on the market. Most typical root cause of Static Unbalance is different SDR of individual cells. After long storage cells with higher Self-Discharge Rate will have less voltage. 

 But if you observe very small unbalance in relaxed state which is increased drastically during charge or discharge it means cells have different internal resistance. If it is increased slowly to the end of discharge it means cells have different individual Qmax so different chemical capacity. Unbalances in charge or discharged are called Dynamic Unbalance and could not be fixed by cells balancers. If Dynamic Unbalance is too big, faulty cells should be replaced.