HP Pavilion g6 Notebook - Sudden shutdowns without warning when battery is low

My notebook is only ten months old. Within the last week, it started shutting down unexpectedly when the battery was low (but not at a critical level). If I try to restart it, there won't be a response until I plug in the adaptor cord. Usually there will be around 20% of my battery left when my computer is booted up after such a shutdown, so I don't think it's because of my battery being low. (Besides, when I've accidentally used my laptop until it has to hibernate, the light next to the port for the adapter cord usually blinks to tell me it's the battery.)
Initially I thought it was a problem with overheating, so I cleaned my vents and bought an external laptop cooler when it first shut down unexpectedly two weeks ago. However, the shutdowns have become more frequent since then. I've run the Memory Diagnostic Tool, the HP Battery Check, and updated my BIOS. No problems have come up; in fact, everything seems to be running perfectly. I also ran AVG and Malwarebytes Anti-Malware. No problems there either.
What could be the problem? Thanks for any help!
Product name: HP Pavilion g6 Notebook PC
Product number: A1J18AV
Windows 7 Home Premium 64-bit Service Pack 1

Mines started doing exactly the same! Its just 12 months old though and hardly ever gives me a low battery warning. Then it will turn off without shutting down the proper way. When I plug in and turn back on, the battery says its at 20-25%
Is there actually a solution to this and whats causing it?..because if it's the battery then **bleep**..they don't last long.

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Hi @timotius ,
Thank you for visiting the HP Support Forums and Welcome. I have looked into your issue about your HP Notebook and having it shut down without warning. Here is a link to restore the BIOS. Please note remove any and all USB devices, and remove memory cards from the card reader slot. Disconnect all non-essential devices.
Can get to safe mode with command prompt? sfc /scannow would scan your system for errors at the command prompt. You could check this Microsoft document on system recovery options.
Here is a link to the HP Support Assistant. Just download and run the application and it will help with the software and drivers on your system. If you needed an update this could cause what you have installed.
Did you install any software or hardware?
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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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HP Pavilion g6 Notebook - Sudden shutdowns without warning when battery is low

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