Widex M-DEX User Instructions page 12

It takes approximately 6 hours to charge the battery
the first time . allow the battery to charge for the full six
hours, even if the "battery full" icon appears .
recharging takes approx . 3 hours, depending on
whether the device is turned on or off .
warnIng
Do not attempt to change the battery yourself . contact your
hearing care professional if the battery needs replacement .
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