K2 battery issue

One of my K2 batteries is behaving oddly today. It’s fully charged but when I press the button to vape, it flashes blue 3 times and doesn’t work. If I take the tank off I get the usual steady blue light when I press the button. The tank is vaping fine on my other K2 battery and on other batteries also. Any ideas on how to fix it or is it destined for the bin?
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