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 What's in the box? I lost my charge case, what do I do? How do I get my YEVO 1 repaired? I lost one of my headphones, what do I do?