Low battery warning light failure - macbook pro early 2011

Hi folks. When our battery indicator (Menu Bar) shows that roughly 20% of its charge remains, the 'puter basically shuts down. It won't revive from sleep mode no matter how many keys, incantations or trackpad touches we try. We have to hold the power button down for 30 seconds or more before the thing decides to reboot. Once it does restart, it doesn't recognize its network, it's clock goes back to 2000. To get back online requires a tour of Network settings, passwords, etc. Any suggestion as to what might be going on here?

First try a SMC reset:
http://support.apple.com/kb/HT3964
You may have a faulty battery.  Open System Information>Hardware>Power>Battery Information.  Post a copy of yours here like this from mine:
Ciao.

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