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First of all try to run Laptop without the battery,if it works fine then your Adapter is OK.
Second make sure the battery is fitted well.
Third try using it with some other Laptop if it runs OK there then probably it's your Motherboard Problem otherwise you need to change the battery.
Fourth battery's average lifespan is 1-2 yrs after that it gradually starts decreasing,if it's that old then again might be a battery problem.
Fifth Battery oftens loose it's charge percentage due to overheating.
Try all the steps and it will help.