W520 sudden shutdown (not the known one)

evenyone experienced this simptum all of a sudden my pc shutsdown and when i restart it it tells me it closed itself because if noticed the battery got to critical level... wierd this is i got 95% left... and i have the pc less than a year so i battery is still good...
i got no idea whats wrong maybe i need to reset the battery stats?

This only happens on battery or also when plugged in?
Usually what the battery gets too low it doesn't just shut down it hibernates. Is your computer hibernating, shutting down, or instantly turning off?
Also, go in to your Windows power settings and see what the settings are for when the battery gets low: what is the low battery threshold and what is the laptop being instructed to do?
W520 i7-2720QM | 32 GB RAM 1333 MHz | FHD 1920x1080 | Quadro 1000M | Windows 7 & Ubuntu 14.04
Crucial M500 480GB mSATA + 2 x 1 TB Hitachi Travelstar 7200 rpm | BIOS 1.38

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