Why My Lap is Shutting Down on Battery unexpectedly even it's showing 80-82% remaining....

[Lithin]

My Lap is 1 and half years old. now it just shuts down unexpectedly even though it's remaining with very high percent of Battery charge........
Can you Guys please help me ??
Specs
Win 8
4 GB Mem
1 TB HDD (Almost Full, just Remaing only 18 GB or else)
Intel i5 3230M

 

[moozilbee]

Sounds like a problem with the battery or power supply.

 

[Lithin]

Thanks bro.....