Why does my mac only work when plugged in?

I have a late 2010 macbook air 11 inch. The battery condition is normal and about has 650 cycles. The light on my charger is green and my computer only stays on when the charger is plugged in. When I unplug it the computer just turns off and my battery says its not charging and that the power source is the adapter. Do I need a new one or is this fixable?

Definitely below the 1,000 max cycle count > Mac notebooks: Determining battery cycle count
Reset the SMC > Intel-based Macs: Resetting the System Management Controller (SMC)

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Why does my mac only work when plugged in?

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