DrkAngel
1 GW
Prologue:
I believe this method of graphing to be a much preferable representation of battery capacity.
Graph program is a free download from http://www.padowan.dk/graph/.
Li-ion - Lithium Cobalt - LiCo
2600 mAh (laptop recycled cells (Gateway) - unbranded dark red - "China" )
Discharged using iMax B6
Tested at .2C discharge rate, to reduce skewing due to "voltage sag"
Voltage monitored at cell with digital meter
Charged to 4.25V
..V... mAh
4.23V .. 4
4.22V .. 5
4.22V .. 6
4.20V .. 9
4.19V .. 18
4.18V .. 37
4.17V .. 38
4.16V .. 38
4.15V .. 38
4.14V .. 38
4.13V .. 38
4.12V .. 38
4.11V .. 40
4.10V .. 40
4.09V .. 42
4.08V .. 43
4.07V .. 44
4.06V .. 44
4.05V .. 44
4.04V .. 42
4.03V .. 43
4.02V .. 42
4.01V .. 43
4.00V .. 44
3.99V .. 44
3.98V .. 43
3.97V .. 45
3.96V .. 46
3.95V .. 45
3.94V .. 45
3.93V .. 47
3.92V .. 48
3.91V .. 47
3.90V .. 45
3.89V .. 43
3.88V .. 42
3.87V .. 44
3.86V .. 45
3.85V .. 57
3.84V .. 57
3.83V .. 78
3.82V .. 82
3.81V .. 86
3.80V .. 88
3.79V .. 89
3.78V .. 86
3.77V .. 94
3.76V .. 98
3.75V .. 103
3.74V .. 102
3.73V .. 105
3.72V .. 120
3.71V .. 125
3.70V .. 100
3.69V .. 100
3.68V .. 100
3.67V .. 78
3.66V .. 74
3.65V .. 72
3.64V .. 74
3.63V .. 72
3.62V .. 71
3.61V .. 70
3.60V .. 45
3.59V .. 43
3.58V .. 43
3.57V .. 24
3.56V .. 20
3.55V .. 20
3.54V .. 20
3.53V .. 17
3.52V .. 14
3.51V .. 12
3.50V .. 10
Output is reasonably steady from about 4.18V till 4.1V.
Slowly increases from 4.1V till 3.85V
Then increases sharply from 3.85V till it peaks around 3.7V.
Below 3.7V output decreases rapidly till it reaches minimum usable at 3.6V.
Based on these figures:
For Li-ion (LiCo),
Charge-discharge voltages should be,
Maximum 4.18V
Minimum 3.6V
3.85V to 3.65V is the muscle bulge of the discharge curve.
To take full advantage of this "bulge" I would recommend "bottom balancing", at 3.65V.
Charging above is 4.2V is worthless, and unnecessarily damaging.
Same for discharging below 3.6V.
Be aware! These results are for a specific cell type-formulation and might have no relation to other brands-types-formulations!
I believe this method of graphing to be a much preferable representation of battery capacity.
Graph program is a free download from http://www.padowan.dk/graph/.
Li-ion - Lithium Cobalt - LiCo
2600 mAh (laptop recycled cells (Gateway) - unbranded dark red - "China" )
Discharged using iMax B6
Tested at .2C discharge rate, to reduce skewing due to "voltage sag"
Voltage monitored at cell with digital meter
Charged to 4.25V
..V... mAh
4.23V .. 4
4.22V .. 5
4.22V .. 6
4.20V .. 9
4.19V .. 18
4.18V .. 37
4.17V .. 38
4.16V .. 38
4.15V .. 38
4.14V .. 38
4.13V .. 38
4.12V .. 38
4.11V .. 40
4.10V .. 40
4.09V .. 42
4.08V .. 43
4.07V .. 44
4.06V .. 44
4.05V .. 44
4.04V .. 42
4.03V .. 43
4.02V .. 42
4.01V .. 43
4.00V .. 44
3.99V .. 44
3.98V .. 43
3.97V .. 45
3.96V .. 46
3.95V .. 45
3.94V .. 45
3.93V .. 47
3.92V .. 48
3.91V .. 47
3.90V .. 45
3.89V .. 43
3.88V .. 42
3.87V .. 44
3.86V .. 45
3.85V .. 57
3.84V .. 57
3.83V .. 78
3.82V .. 82
3.81V .. 86
3.80V .. 88
3.79V .. 89
3.78V .. 86
3.77V .. 94
3.76V .. 98
3.75V .. 103
3.74V .. 102
3.73V .. 105
3.72V .. 120
3.71V .. 125
3.70V .. 100
3.69V .. 100
3.68V .. 100
3.67V .. 78
3.66V .. 74
3.65V .. 72
3.64V .. 74
3.63V .. 72
3.62V .. 71
3.61V .. 70
3.60V .. 45
3.59V .. 43
3.58V .. 43
3.57V .. 24
3.56V .. 20
3.55V .. 20
3.54V .. 20
3.53V .. 17
3.52V .. 14
3.51V .. 12
3.50V .. 10
Output is reasonably steady from about 4.18V till 4.1V.
Slowly increases from 4.1V till 3.85V
Then increases sharply from 3.85V till it peaks around 3.7V.
Below 3.7V output decreases rapidly till it reaches minimum usable at 3.6V.
Based on these figures:
For Li-ion (LiCo),
Charge-discharge voltages should be,
Maximum 4.18V
Minimum 3.6V
3.85V to 3.65V is the muscle bulge of the discharge curve.
To take full advantage of this "bulge" I would recommend "bottom balancing", at 3.65V.
Charging above is 4.2V is worthless, and unnecessarily damaging.
Same for discharging below 3.6V.
Be aware! These results are for a specific cell type-formulation and might have no relation to other brands-types-formulations!