Repairing Humminbird Smartcast RF15e Fish Finder

Humminbird "Advanced RSS" Sonar modules got a CR2032 battery inside, just in case you need to repair one.

The case is sealed by ultrasonic, so you need to cut the plastic with a sharp knife and glue the case shut when done.

The water sensor terminals need to be de-soldered
It's pretty easy, once opened.
Glued together