I got a great deal on a pair of Group-27 gel cell batteries. This, of course, meant that the existing battery box was not big enough, as the new battery is about 3" longer than the old one. I fabricated an extension to the existing box on starboard, and also added a new battery box on port, for the second battery.
This is the starboard battery...
...and the assembly, epoxy sealing, and installation of the port battery box:
© 2018 Melissa Goudeseune