The critical level of my battery is 7%. But recently, the laptop shuts down at 17% although I have set to hibernate from the Power options when the battery reaches 7%. Any ideas?
Answer
This is a very common failure mode with "smart" lithium-ion batteries.
Basically, as a battery ages, its internal resistance increases. This means that under load, its voltage drops more. This throws off the battery's fuel gauge. From one of my previous answers (which assumes a battery with three cells in series):
A battery at 11.1V may have about 40% charge when new but the same voltage may indicate a less than 10% SoC on an old battery.
You might be able to calibrate the fuel gauge by discharging the battery fully, then charging it fully again. However, considering how old the battery is, you should consider replacing it.
Your images indicate that this is a PR09 battery, which is now discontinued. You might still be able to find limited supplies of the genuine OEM battery, but they're going to be limited, and third-party replacements may be easier to get. Before you buy a replacement, be sure to check the reviews, since third-party batteries can be less reliable than OEM batteries.
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