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original H2O is glued all around. battery itself is glued as well.
there is a risk of breaking the replace when doing either (open the device, and again when removing battery)
if the device is working then I would not do it unnecessarily. keep it on the charger overnights and read and see if it lasts you or not. if it does there's not much reason to do anything, and even then you could consider using a powerbank instead of risking it
IMHO the video shows completely wrong method of opening it (the front bezel can be taken off as one piece, without separating it in bezel+IRguide)
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