Some devices doesn't have indicator that it is already fully charged so my advise is since almost all rechargeable gadgets needs to be charged 4-8 hours depending on the power needed by the device for example a cellphone that uses 37 volts li-ion battery should be charged 3-4 hours to use it in its maximum capacity. so look how much power needed by the device and charge it at least 4 hours for the battery to be full.
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