Guys my mac air show no indication of battery before yesterday, yesterday was fine, today same problem no battery and PC working very slow . ***?

Guys need help. Evrything started 3 days ago, at first my mac saying no batteries available, power source: power adapter. However after googling the issue I turned PC and went to bed, next morning I turned on Mac and evrything was fine battery was present good charge and I wasn't charging mac  before it runs out off charge. This morning, problems has returned, accompanied with very slow performance of mac . Any advice?

Try resetting SMC.
If resetting SMC does not help, you may have to contact Apple to gave the power system checked out.
Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
For more info about battery:
Click  in the menu bar.
About This Mac > More Info.. > System Report > Hardware > Power > Battery Information
Best.

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