I would stay away from those tupperware type containers, they're not as waterproof as they appear to be. Don't be cheap or you'll be replacing things every few trips, buy quality marine grade products and save yourself the headache. I have my ff/gps battery in a pelican case, three years later the inside is still dry.
Second thing.........although those crimps are not below the water line I can guarantee they are going to corrode on you after the first few trips. You can goop them but even then they'll still corrode.
