To charge the battery, plug the charging cable into the charging port located on the left of the headset. Then, connect the other end of the charging cable to a power outlet or your computer. It can take up to two hours to fully charge Insight. However, the length of time it takes to recharge your Insight depends on the remaining capacity of the lithium polymer battery. If your Insight is unused for an extended period, the battery will become heavily depleted of charge. If this happens, you may need to charge your headset for 24-hours.