I received the X3 as a Christmas gift last year (so just under a year old), and they battery seems to not be charging properly anymore, when I turn them on it says "charge me" and when I check the app, the battery is sometimes as low as 1%. Other times, it seems to charge fine but then will die after 40 minutes, and I have also have them give the charge message when I turn them on and then over the following hour or so the battery life will increase (when I checked the app initially it says 1% but then if I go back 20 minutes later it will say 40% and then 75% but still doesn't last as long as it used to). They sometimes also do not turn on the first time, if they don't turn on initially, they usually turn on when I try again 15-20 minutes later.
I know it is not sweat damage to the battery as I rarely use them at the gym and mostly use them for studying or commuting.
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