Honestly, if you lose your charging case, just buy a new set. You have to place the earbuds in exactly the right position, and god forbid you move (walk, run, sit) and they fall off the sensors and start draining the battery. A couple of times I have to use the headphones on the go and end up with a fully charged case but a completely dead earbud as they won't connect to the sensors. Just terrible quality.
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