I recently got a new pair of Tarah Pro earphones. When I received them they did not turn on (they were out of charge, I guess) which is unusual for many electronic devices.
I have found that after charging them fully (through computer/laptop USB ports) they will lose their charge quite quickly when not in use. After around two days after finishing charging, they will lose around 20%.
I don't think this is expected considering the earphones have a Lithium Ion battery.
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