Sounds like the adapter might not be able to provide quite enough power to the laptop when it's under maximum load so it uses the battery a bit. As long as it's not inconvenient it isn't really a problem.
It could be an actual problem with the power adapter (though that seems unlikely to me), or it could be that whatever they do to make it accept 220V isn't as efficient and results in not quite as much power available to the laptop.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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