1/ Use the earbuds till reaching the 0%
2/ Put earbuds in the charging box until 100%
3/ Leave it charging with the original USB at least for 2 hours
if you have any questions call us on 16852 from 10 Am to 6 Pm or fill in the Support form on https://cardoo.co/support/ you will get a ticket number, Our team will call you within 3 working hours