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Normally the life time of a laptop battery is 300 cycles. that is 300 discharges and charges. Since your laptop is almost 2 years old, the battery could be at the end of its life time, and again depends on how often you use your laptop in a day. Better goto a service center or get a similar battery from any of your friends just to make sure it is not a motherboard issue. Then you can think about which part you've to replace.
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The most common problem is a loose DC connector on the system board. If you plug in the adapter and wiggle it slightly. If you can move it, that means that the DC connector is indeed loose. You have to take the unit apart and resolder the connector.
You either have a bad battery or the connector on the motherboard is bad. Have you tried another battery? Try doing a power drain.
Remove the battery and the AC connector, hold down the power button for 10 sec. Plug the AC connector back in and boot up your machine. Once it's fully booted then shut it down and plug the battery back in and try that out.