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The manufacturer of mobile devices promise a battery life of up to eight hours with notebooks, cell phones with more than ten days and a lifespan of about three years. In general, the cells provide energy but after half a year less dramatic or even unusable.

In the mobile business use laptops, PDAs and cell phones are indispensable helpers. You should go to work long and reliable service. Therefore, the decisive criterion for buying such a device, the Dell Inspiron 1520 battery time. Manufacturers shall not mince words and outdo each other with a running time information.

After the acquisition of a mobile device may be the buyer with the running time of the battery still satisfied. But after a few months, followed by disillusionment – the full-bodied propagated term of the manufacturer is no longer approximated. The help-seeking handle for manual turns out to be generally unsuccessful. In the User Manual takes the user only rudimentary care instructions for the Dell Inspiron 1545 battery, often followed by a terse note: “the battery life remains after full load remains low, the battery has reached the end of its life and should be replaced.” Additionally, discloses a further look into the warranty that the battery is excluded after six or twelve months from the guarantee. The subsequent transition to the dealer pulls depending on battery type a big hole in your wallet.

The question is rightly irritated users, whether the good reputation of the lithium-ion Dell Inspiron 1564 Battery is justified. The producers talk about the lithium-ion battery has a lifespan of more than three years. In addition to the energy supplier to withstand well over 500 charge cycles without damage. We explain what the manufacturers conceal and what the user must pay for lithium-ion batteries.

Cycles / life in theory and practice
Nearly all lithium-ion Dell Vostro 1500 battery manufacturers say their energy-promoting a lifetime of about 500 to 800 charging and discharging cycles to. Some notebook manufacturers such as Fujitsu Siemens are slightly more conservative and give about 300 cycles of “proper care”, while others conceal the statement completely – and not without intention.

The achievement of the nominal load cycles is dependent on many factors. The most important parameters are the discharge current or the electrical load and temperature. Under ideal conditions, ie at 20 degrees Celsius ambient temperature and a load of 1 / 5 of rated current (0.2 C), more than 500, the battery charging and discharging cycles to reach the battery capacity limit of 80 percent. If you change the exposure value on a C, so the Dell Inspiron 1720 battery is only about half the number of loading cycles.

In addition, the difference between the nominal battery capacity is greater, the higher the battery is charged. Ideally, therefore, a lithium-ion battery that can be loaded in the notebook, mobile phone or PDA, with 20 percent of the rated current to achieve the optimal performance in terms of the charge and discharge cycles. For example, a DELL Studio 1555 battery with a capacity of 4320 mA / hr (11.1 volts), ideally operated at 864 mA load current. In reality, the notebook this value (0.2 C) is achieved only with extremely preferred power-saving options – if at all. Under maximum operating conditions such as a high utilization of CPU, graphics, display and hard disk are electrical loads up to rated current specification (1 C). Thus while the operating temperature of the battery increases dramatically, which further accelerate the aging process and the performance deterioration of the lithium-ion cell.

Temperature Effects
The temperature of the DELL Latitude D620 battery cell during the discharge process has a serious influence on the achievable overall battery capacity. The lithium-ion batteries tolerate neither too high nor too low temperatures. The ideal “working temperature” is, according to the battery manufacturers between 20 and 40 degrees Celsius. Even at an ambient temperature of 60 degrees centigrade, the energy source is only about 95 percent of their total capacity. The same is true for low temperatures. Thus, a lithium-ion battery provides at a temperature of zero degrees Celsius, only about 90 percent of the nominal power.

In practice these numbers mean that the DELL Latitude D630 battery work at normal ambient temperature at the most effective and longest. However, such ideal conditions are almost never reached. In general, the individual battery cells are housed in an enclosure with a corresponding control electronics. This battery pack sits mostly inside the notebook. Through the “Working discharge” the battery and the heat generated by the other components in the laptop like processor, graphics chip, chipset, hard disk, and voltage regulator can heat up the battery cells to temperatures exceeding 50 degrees Celsius. In addition, inadequate ventilation increases the “hotspots” on the underside of the notebook on the internal temperatures in the device. Thus, even at “normal” operation of the notebook full capacity due to excessive thermal load on the DELL XPS M1530 battery elements never used. With cell phones and PDAs, the burden of high operating temperatures usually is not given. In these devices, a storage location with strong sunlight affects adversely as on a desk or in a car, the electrical properties.