Laptop battery terminology

Many people use laptop for a long time, but do you know the laptop battery really? I think it is useful for you to know some terminology about laptop battery.

Primary battery: The laptop battery can only discharge. The battery can not be charged when the electric power is burning up. The alkaline batteries on the market, manganese dry cell, mercury batteries, they are all non-rechargeable batteries.
Rechargeable battery: The laptop battery can charge repeatability after the electric power off. For example, lead acid, nimh, lithium ion battery, etc.
Nominal Capacity: Generally, the storage battery power will mAh hour or AH ampere hour to says when battery full after power, voltage, discharge to deadline to take it out of power, it is this of your battery capacity. A battery capacity, and it related with its load, so usually do not try to mark.
Nominal Voltage: Because the materials of the positive and negative charges, for chemical reaction, creates the erps height, using this relationship, the resulting voltage, called the rated voltage. Different is anode materials, the resulting voltage is different, such as: lead-acid batteries - 2V/cell, nimh batteries 1.2 V/cell, lithium ion battery 3.6 V/cell.
Internal resistance: The battery is made of chemical material composition, has certain impedance, the discretion of the internal battery charging and discharging characteristics influence often.
Positive Electrode: Symbol for +.
Negative Electrode: Symbol for -.
Cut-off discharge voltage: The battery in discharge test, to cross the finish line voltage. General Ni mh battery set to 1.0 V, Li - IO battery set in 3.0 V or 2.7 V.
Depth of discharge: Compare with the nominal capacity, the ratio of discharge power.

Over charge: When the laptop battery reach full filling state, continue to the extent of the ize, excessive rechargeable battery may cause damage.
Memory effect: In the case of the battery is not put finish electric, if charge the battery, it may not be returned to the original level, but if compulsory depth discharge capacity in charge, the capacity will return to normal, the situation usually happen on the ni cd battery.