Is there any maintenance necessary to keep the battery functioning like new?

1.To maintain the NOCQUA battery longevity: Most smart phones, action cameras, and other electronics that you come in contact with every day employ Lithium Ion technology. Just as you do not need to cycle your smart phone, you do not need to be concerned about the NOCQUA battery’s “memory” or discharge cycles. For the average user, simply using the provided charger will be enough to ensure a long battery life. 
2.Salt Water Care:
(a) Flush the connection ports with fresh water after EACH use.
(b) Utilize and liberally apply marine grade anti-corrosion or corrosion inhibiting spray/grease on the connections.