First, How to calculate laptop battery endurance time?

Battery capacity refers to the size of the battery storage capacity. The unit of battery capacity is the “mAh”.

Suppose the battery rated capacity is 1300mAh, if 0.1C (C is the battery capacity) that is use 130mA of current to discharge the battery, then the battery can continue to work for 10 hours (1300mAh/130mA = 10h).If the discharge current is1300mA, and that for the electric time only 1 hour (there are some differences that the actual working time due to the individual differences of the battery’s actual capacity). This is the ideal state analysis,  the current of digital equipment actual work is not always constant at a value (take digital cameras as an example, because of the LCD display, flash and other components on or off can occur the work current large change), so a device’s battery life is  not a sure values, and this value is only through hands-on experience to estimate.

Laptop Rated Voltage:

General laptop rated voltages are 10.8V (11.1V) or 14.4V. A lithium-ion battery voltage is 3.6V, which surely can not reach the need of laptop voltage, so commonly used in series approach. If the rated voltage is 10.8V, it is a series of three, four series voltage becomes 14.4V, but some of the secondary battery in the factory calibration of single-cell lithium-ion battery voltage is 3.7V, so the voltage to string together three to 11.1V.
A lithium-ion battery voltage range between 3.0 ~ 4.0V. The voltage with full power (charge termination voltage) is usually 4.2 ± 0.05V, the termination of discharge voltage is 2.5 ~ 2.75V.

Clear from the foregoing, laptop battery rated voltage is basically unchanged, and the battery rated capacity multiplied by the rated voltage, that is the battery power, such as the battery rated capacity of 4400mAh, a rated voltage of 11.1V, the battery power 48.8Wh.

Specific to the actual can be How long will primarily use the laptop on all parts of consumption, such as the ATOM CPU average TDP only 2.5W, general office use, then the machine power consumption of around 20W, so 48.8Wh/20W = 2.4 hours, that life was about 2.5 hours .

Second, the whereabouts of laptop batteries main consumption
1, LCD: This is the most important aspects of power consumption, rather than many of my friends think of the CPU. LCD’s power consumption is mainly derived from the backlight lamp, that is, with the increase in brightness, its power consumption has risen sharply.

In general, LCD backlight lamp power consumption accounted for 75% of total electricity consumption; Secondly, the screen size and resolution also affects the power consumption, display the greater resolution, the higher the power consumption of the more impressive. The average total electricity consumption accounts for about laptop LCD’s 1 / 3.
2, Graphics card: An independent graphics card power consumption even higher than integrated graphics card.
3, CPU: Different from the LCD’s power consumption is relatively constant, CPU power consumption increases with the increase in work pressure. In the general office applications, accounting for 8% -15% total electricity consumption.

4, Motherboard and Chipset: PCI Express introduced, the improved performance while also increasing power consumption.
5, Hard disk and CD-ROM/DCD-ROM: An average of 10% of the total electricity consumption.

6, Cooling system: With the CPU and the graphics workload increased, that is a corresponding increase in its heat, cooling system also consume more power.
7, Network and peripheral interfaces: The power consumption of wireless network card can not be ignored. Others such as USB port, when its connected equipment, power consumption is generally around 5 watts, it is very impressive; sound in games and DVD players in the power consumption increase is obvious.

Third: Power consumption Comparison in different applications

As the computer workload increases, a corresponding increase in notebook power consumption, not only reflected in the increase in CPU power consumption, also reflected in other components, such as graphics cards, motherboards, cooling systems, hard disk drives.

Fourth, Laptop endurance evaluation software

MoblieMark 2007: Regular business office operations without interruption throughout life, and DVD drive playing endurance.
BatterMon: Laptop battery monitor, shows the design capacity of the battery discharge curve, discharge voltage and other data;
BatteryMark: The authority of notebook battery life test software to test laptop batteries in the general load and the maximum load of the use of time.