Battery Pack (Megaphone / CoxBox®)

Battery Pack is a reliable replacement power source designed to keep your CoxBox® and Megaphone running smoothly on the water. Built for durability and consistent performance, it ensures your equipment stays powered throughout training sessions and race days.

Compact and easy to install, the Battery Pack is ideal for maintaining the performance of compatible rowing devices and ensuring you’re always ready for your next session.

Charge Time and Battery Life

A fully flat battery takes about 12 hours to charge to 100%. Partial charges will take less time (can range around 3-4 hours). A full charge gives about 8 hours of typical operation. NK defines this as speaking roughly 35% of the time at volume level 6. A charged battery will retain its charge for up to two months if left in the Blue Ocean Megaphone and six months if stored separately. It is recommended to charge your battery every 2-3 months when not in use to maintain battery life.