For an accurate representation of the charge / discharge characteristics of the cell, similar look up tables must be developed for all the known factors which significantly affect the cell capacity (Ah) and impedance, such as cell temperature, ambient temperature, charge and discharge rates, heat dissipation rates, the cell self discharge rate charge or coulombic efficiency and the capacity degradation over the lifetime of the cell.
ASUS U56E Battery feature:
Battery Type: Li-ion
Capacity: 4400mAh /63Wh / 8Cell
In dynamic applications such as automotive batteries, inputs must be monitored at least once per second to ensure that no significant charge flows or critical events are missed and the SOC prediction for every individual cell in the battery must be completed during the sampling interval. Because of the complexity of the algorithm and the number of inputs involved the system must perform over a million or more floating point calculations per second. This requires a powerful microprocessor. An example of the need for continual updating of SOC estimations in a working system is given in the section on Battery Management Systems.
ASUS U56J Battery Compatible original Battery Code:
4INR18/65 4INR18/65-2 A41-U36 A42-U36
During the cell charge - discharge cycles the composition of the active chemicals in the cell changes as the chemicals are converted between the charged and discharged states, and this will be reflected in changes to the cell impedance. Thus measurements of cell internal impedance can also be used to determine SOC however these are not widely used due to difficulties in measuring the impedance while the cell is active as well as difficulties in interpreting the data since the impedance is also temperature dependent.
The laptop industry experiences an even more astonishing battery return pattern. Nine out of 10 batteries returned under warranty have no problem or can easily be serviced. This is no fault of the manufacturers but they pay a price that is ultimately charged to the user.
ASUS U56JC Battery Fit machine:
ASUS U56 Series
ASUS U56E Series ASUS U56J Series ASUS U56JC Series
The other main factor that can drastically reduce your battery life, is if it is left in a fully discharged state for several weeks or months. If a Lithium-Ion battery becomes too 'flat' it will refuse to be charged up again (even though the battery cells are probably good). If this happens you will need a new battery. For this reason do not store the battery for more than a week or so in a fully discharged state.
The cell voltages on a battery string must be similar, and this is especially important for higher-voltage VRLA batteries. With time, individual cells fall out of line, and applying an equalizing charge every six months or so should theoretically bring the cells back to similar voltage levels. While equalizing will boost the needy cells, the healthy cell get stressed if the equalizing charge is applied carelessly. What makes this service so difficult is the inability to accurately measure the condition of each cell and provide the right dose of remedy. Gel and AGM batteries have lower overcharge acceptance than the flooded version and different equalizing conditions apply. Always refer to the manufacturer’s specifications.
If not using the notebooks during the day on the mains supply, it is best to switch them off (or allow them to timeout and enter standby or hibernate mode), because if you leave them on, they will get slightly warm and this will slightly shorten the battery life. Alternatively, remove the battery if you know you are only going to use the notebook on the mains (and store the ASUS U56 Battery in a cool place with more than 50% charge in it).