The most important battery tag

Capacity:
The capacity of a battery is measured in milli-ampere-hours (mAh). 4500 mAh, for example, mean that the battery provides 4500 mA for an hour or three hours, 1.500 mA current. Then he is discharged and the voltage breaks down under stress. NiMH batteries of standardized size "AA", the one usually used in cordless phones and Digitakameras reach, currently has a capacity of 2,500 mAh. bring good lithium Dell XPS M1530 battery in laptops, it mAh to over 6,000.

Some manufacturers state in Li-ion battery, the stored energy in watt hours (Wh) at. This unit, but you can easily convert mAh: If, for example in the electricity dispenser 10 Wh and 7.2 volts, then divide these two values (10 Wh / 7.2 V) - the battery therefore has a capacity of 1,400 mAh .

Sorry, there are not standardized laptop batteries such as NiMH cells (AAA, AA, etc.), but there are a variety of laptop batteries. Therefore you should consider before buying a laptop replacement Dell Inspiron 6400 battery absolutely sure that he really fits well with the laptop.

Battery Laderat e:
This term is used, regardless the size of the loading or discharging of the battery capacity indicated. For example, a 1000 mAh Dell Studio 1537 battery with the charging rate of 3 C is loaded, is 3 times the charge current 1000 mA, or 3 amps.

Impedance or internal resistance:
The lower the internal resistance, the better the current flows. Increases the internal resistance in lithium Dell Inspiron 630m battery due to aging or (especially for nickel batteries) due to incorrect loading, then the powered devices switch after a few minutes of running again. With about 100 milli-Ohm NiCd cells have the lowest resistance, followed by Li-ion (150 milli-ohms) and Li-polymer battery (200 milli-ohms). NiMH cells with more than 200 milli-ohms to the highest internal resistance, which can increase with improper maintenance to over 350 milli-ohms.

Memory and lazy battery effect:
Nickel batteries are acidic when they are not required - then fails on NiCd batteries and the memory of NiMH cells of the lazy battery effect. Both effects caused by frequently to shop with low power (for example, the loading rate 0.1 C) or if you forget to unload batteries from time to time entirely.

It is this form of small crystals on the electrodes. The result: The operating time is reduced by up to 90 percent, because the internal resistance increases and thus breaks down the voltage under load. Except for one difference is similar to both effects: the lazy Dell Studio 1555 battery effect does not occur so abruptly as the memory effect. Modern lithium batteries do not know the memory effect, they suffer, however, among other weaknesses, particularly the limited lifetime.