The remaining battery charge varies between the left and right earbuds

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The battery consumption speed of each earbud is a bit different depending on each function setting and under what conditions you use them. It's expected behaviour. The numbers you see in the Headphones Connect app and given by voice guidance, are estimates that can differ a bit. 

To minimise any differences, it's best to keep your earbuds safely tucked away in the charging case when you're not using them.