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Excellent, good to know it works with the H300 series. Getting 24+ hours would be sweet.
One concern - Juergen you say there is no room left in the player between back panel and the new battery. Would that create an issue with heat?
If the original battery left an air gap would that be there to help keep the battery cooler than if there is no gap.
I've read that heat from long recharges is what kills batteries of this type, so that's why I'm asking.
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