Do the earpieces fit into the case? Not all the earpieces fit. The ear buds and the ear speakers will fit nicely. How long do we need to charge the rechargeable batteries when we first get them? Charge the batteries two full cycles (13 hours each) before use. Is the 16 unit the largest charging case you offer? Yes. Can you ship the case without packaging it up? No, shipping cases without external packaging, the cases can be easily damaged and equipment lost. Always use additional packaging when shipping cases.