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If thelaptop battery is more than 3 - 4 years old then the battery could be worn out.Rechargeable batteries have a finite number of charge and discharge cycles andwill lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up at all. OR Thebattery shows a 100% charge but when the adapter is disconnected the batterydrops off to zero capacity in a very short time. If the battery drops to anunacceptable charge level then the battery needs to be replaced.
fix first the power adapter/ it not charging some problem of your power adpater,, check the charger if it is working properly or not, then follow by dc connector should know that your dc connector has no deffect// if its okay check the motherbaord of your pc maybe som chips need to replace or damage...ic capacitor fause..ech..