What type of battery does the YEVO 1 use? The YEVO 1 headphones are fitted with a 55mAh Li-Ion battery. The Charge case is fitted with a 600mAh Li-Ion battery. Related articles My YEVO stopped working, what do I do? How long is the warranty valid? How do I get my YEVO 1 repaired? How to fit your YEVOs in your ears I lost my charge case, what do I do?