How to make full use of lithium batteries

With the development if the science and technoligy,hp nc6000 battery are becoming more and more important in powering our computer and other electronic.Battery research is focusing heavily on lithium chemistries, so much so that one could presume that all portable devices will be powered with laptop batteries in the future. In many ways, laptop is superior to nickel and lead-based chemistries and the applications for laptop batteries are growing as a result.


laptop has not yet fully matured and is being improved continuously. New metal and chemical combinations are being tried every six months to increase energy density and prolong service life. The improvements in longevity after each change will not be known for a few years.


A laptop battery provides 300-500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery. There is no concern of memory when applying unscheduled charges.

Although laptop is memory-free in terms of performance deterioration, batteries with fuel gauges exhibit what engineers refer to as "digital memory". Here is the reason: Short discharges with subsequent recharges do not provide the periodic calibration needed to synchronize the fuel gauge with the battery's state-of-charge. A deliberate full discharge and recharge every 30 charges corrects this problem.


Letting the hp nc8000 battery run down to the cut-off point in the equipment will do this. If ignored, the fuel gauge will become increasingly less accurate. (Read more in 'Choosing the right battery for portable computing', Part Two.)


The speed by which laptop ages is governed by temperature and state-of-charge. Figure 1 illustrates the capacity loss as a function of these two parameters.



The mentioning of limited service life on laptop has caused concern in the battery industry and I will need to add some clarifications. Let me explain:

If someone asks how long we humans live, we would soon find out that the longevity varies according to life style and living conditions that exist in different countries. Similar conditions exist with the batteries, laptop in particular. Since BatteryUniversity bases its information on the feedback from users as opposed to scientific information derived from a research lab, longevity results may differ from manufacturer' specifications. Let's briefly look at the various living conditions of the laptop battery.


The worst condition is keeping a fully charged sony vgp-bps2a battery at elevated temperatures, which is the case with running laptop batteries. If used on main power, the battery inside a laptop will only last for 12-18 months. I must hasten to explain that the pack does not die suddenly but begins with reduced run-times.


The voltage level to which the cells are charged also plays an important role to longevity. For safety reasons, most laptop cannot exceed 4.20 volts per cell. While a higher voltage boosts capacity, the disadvantage is lower cycle life. Figure 2 shows the cycle life as a function of charge voltage.