The following are the battery types normally used in Lap Tops
Nickel Cadmium (NiCd)
NiCd batteries were the first rechargeable batteries for notebook computers and featured low cost, versatility and high output current capability. NiCd batteries can be charged rapidly and used in a wide range of products. However, they are now being designed out of notebooks in favor of the newer and higher power NiMH and LiON batteries.
Nickel Metal Hydride (NiMH)
NiMH batteries represented a significant improvement over NiCd batteries due to improvements in cost, safety, reliability and capacity. Currently the most widely used notebook battery, the NiMH battery has only one drawback. The "memory effect" of NiMH batteries requires that they be fully discharged prior to recharging for maximum charge effectiveness.
Lithium Ion (LiON)
LiON batteries are now the most popular notebook battery because of improvements over NiMH in the area of memory effect. In addition, for batteries of comparable capacity, LiON batteries are generally somewhat lighter in weight than NiMH batteries. Because the LiON chemistry is the newest in the market and offers these benefits, the market price for LiON batteries is often significantly higher than for NiMH batteries with the same actual capacity.
As majority of the present day laptops use Lithium Ion Batteries, let us limit our discussion on charging/discharing tips on those type
The modern lithium battery can be charged regardless of its current percentage, given that it has absolutely no negative effect in its performance.When fully charged, remove the battery and allow to voltage to revert to a more natural level like relaxing after exercise. Although a properly functioning Li-ion charger will terminate charge when the battery is full, some chargers apply a topping charge if the battery terminal voltage drops to a given level.
Specific to your question - "Plugging in of laptop to AC socket damage the battery“, the answer is necessarily not because once the lithium-ion battery is full the charger discontinues charge and only engages when the battery voltage drops. That is the characterstics of present day 'intelligent chargers'.
Everyone wants to keep the battery as long as possible, but a battery may often operate in environments that are not conducive to optimal service life. Furthermore, the life of a battery may be cut short by an unexpected failure, and in this respect the battery shares human volatility. The performance of a Lithium Ion battery also degrades in higher operating temperatures.
Source:http://forum.electronicsforu.com/forum/technologies-work/software-programming/451-battery-warning
Nickel Cadmium (NiCd)
NiCd batteries were the first rechargeable batteries for notebook computers and featured low cost, versatility and high output current capability. NiCd batteries can be charged rapidly and used in a wide range of products. However, they are now being designed out of notebooks in favor of the newer and higher power NiMH and LiON batteries.
Nickel Metal Hydride (NiMH)
NiMH batteries represented a significant improvement over NiCd batteries due to improvements in cost, safety, reliability and capacity. Currently the most widely used notebook battery, the NiMH battery has only one drawback. The "memory effect" of NiMH batteries requires that they be fully discharged prior to recharging for maximum charge effectiveness.
Lithium Ion (LiON)
LiON batteries are now the most popular notebook battery because of improvements over NiMH in the area of memory effect. In addition, for batteries of comparable capacity, LiON batteries are generally somewhat lighter in weight than NiMH batteries. Because the LiON chemistry is the newest in the market and offers these benefits, the market price for LiON batteries is often significantly higher than for NiMH batteries with the same actual capacity.
As majority of the present day laptops use Lithium Ion Batteries, let us limit our discussion on charging/discharing tips on those type
The modern lithium battery can be charged regardless of its current percentage, given that it has absolutely no negative effect in its performance.When fully charged, remove the battery and allow to voltage to revert to a more natural level like relaxing after exercise. Although a properly functioning Li-ion charger will terminate charge when the battery is full, some chargers apply a topping charge if the battery terminal voltage drops to a given level.
Specific to your question - "Plugging in of laptop to AC socket damage the battery“, the answer is necessarily not because once the lithium-ion battery is full the charger discontinues charge and only engages when the battery voltage drops. That is the characterstics of present day 'intelligent chargers'.
Everyone wants to keep the battery as long as possible, but a battery may often operate in environments that are not conducive to optimal service life. Furthermore, the life of a battery may be cut short by an unexpected failure, and in this respect the battery shares human volatility. The performance of a Lithium Ion battery also degrades in higher operating temperatures.
Source:http://forum.electronicsforu.com/forum/technologies-work/software-programming/451-battery-warning
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