There is only two ways to fix this:
SMC - Static discharge
1. Take out the battery and disconnect MagSafe cord
2. Hold the power button for 30 seconds (static discharge)
3. Plug-in power adapter & MagSafe cord, wait until the cord LED is green
4. Put the battery back in
If that doesn't work ...
'Recalibrate the battery (takes a long time)
1. Charge your battery up to 100% until the MagSafe cord LED is green
2. Disconnect the MagSafe cord and run the system all the way out of batteries
3. Put the computer to sleep (5 hours) to finish discharging the batteries charge
4. Charge it back up all the way
Anything else is pointless, it's the SMC services within your system, it's not a software problem.
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I had the Service battery alert last year on my MBP early 2011, and after a few months the battery died. It even inflated after I noticed it reached 0% of the design capacity (informed by coconut battery).
I took the battery off the MBP and bought another here in iFixit like 6 months ago.
This week this new battery reached 2.5% of the design capacity.
Today I took the MBP to the local apple authorized support.
I'm very pessimistic, and I think they'll charge me even though I think this is a design problem.
Any ideas?
von Mateus Longo
Matt's Static Discharge solution below was the only one that worked for me. Kudos to him!
von Mike Rich