On average, the earbuds provide 9h of battery life on a single charge and the charging case should hold approximately four full charges to the earbuds.
If you decide to use our ""High Power Mode"", you'll sacrifice about 20% in battery efficiency in return for greater acoustic fidelity, a wider sound stage and a lower noise floor. You'll still get 7h on a single charge, and 40h total with the case! That's enough to fly from London to New York on a single charge, without having to put them in their case.