Notebook battery cells arrived

New battery cells arrive! Those Samsung (Made in Korea) cells is manufactured 2008 with code number 844, newest Samsung Li-ion chemical formula reversion E. Litium ion cells have a maximum 3 years cells life in notebook even though it is not been used.

Please note that all the information below is not from internet but the true capacity tested by our equipment.

Rated Capacity: 2400mAH/4800mAH
Real capacity: ~2346mAH/4692mAH
Real Energy Stored: ~8.4WHr per cell (multiply by number of cell) -example 8.4*6=50WHr in 6 cells battery pack, 67.2WHr in 8 cells battery.
Energy Density including battery container: ~175WHr/KG

Test Condition:
Discharge at constant current 2A (~1C) from 4.2V down to 3.0V
Charge at constant current 1A (~1/2C) up to 4.2V.


x-axis, ~165mAH or 5 minutes per unit.
y-axis, 50mV per unit.

Note 1: Good cells usually "n-turned" at around 3.4V. Poor cells may "n-turned" at around 3V to 3.3V. The lower is the "n-turn", the less power it going to deliver. Some people use WHr to represent the real power. Take average of voltage along the curve and multiply with mAH, you will get Whr.

Note 2: Good cells usually have rise back Voltage at around 3.3V after fully discharge to 3.0V. Poor cells will have rise back to more than 3.5V, resulting in less charging capacity after discharge, which will reach 4.2V very fast.

Note 3: Good cells will have same characteristic curve for all cells. This is very important because different characteristic curve when mix up, can shorter the overall life of a battery pack.

http://alternative-battery.blogspot.com/2008/06/notebook-battery-cells-arrived.html

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