Hi Kevin,
It's possible that either your battery is dead or your laptop charger does not function properly.
As batteries age, the repeated charging and depletion naturally lessens the battery's ability to hold a charge. If you need to learn how to replace the battery, you can do so with the guide Lenovo Yoga 3 14 Battery Replacement.
If your battery is not dead or dying, you may need to replace your laptop charger. It may no longer function due to natural wear and tear.
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