It is actually dependant on whether you need to use the external power for charging your battery. Battery’s charge cycles have a direct relationship with its life. Usually there are only 450 to 500 Cycle of discharge and charge for the battery. Every time, we charge the battery, the number of chargeable cycles is reduced by one. However, currently a lot of notebook manufactures have taken the battery’s vulnerability into consideration by improving the battery when external power is in place for long time because high temperature is always not good for battery. Laptop can release a certain amout of heat when in operation, thus will cause damage to battery. — upto 500 cycles