ZOLO Liberty left earbud not turning on at all (dead led)

Despite a ridiculous amount of time troubleshooting and fixing a pairing issue between the buds, several months ago I started using my ZOLO Liberty product.

I use them for workout, and I keep them inside their charging case correctly plugged within a bag pocket together with a locker, clean clothes and my gym digital access key.

After a month without going to the gym, I come back, turn on the bluetooth but only the right earbud behaves normally. As title suggests, left bud looks completely dead for no reason. Pressing the button does nothing at all, putting it back into the case doesnt even make the led blink.

What the devil happened?
How do I fix this?

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I would check the contact points on the earbuds and case to make sure they are clean, if that didn’t work I would plug the case into a charger and then put the earbuds in it.

Plug the case into a charger and leave it to charge overnight. Sometimes when these batteries get drained for long periods of time it takes even.longer for them to revive and charge

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I definitely agree with @Tank, I have had devices do this type of thing before and a good overnight charge fixed it.