Ladykate - to avoid having your battery slip and fall off...add velcro to the battery and the location where it sits. Using the velcro and the straps assures you that your lipo will not slip off. When my F550 went in for a swim the battery remained snuggly in place...even with the impact of crashing into the water....and that was a pretty hard slam.
[youtube]http://www.youtube.com/watch?v=9dTA5ySzF60[/youtube]
[youtube]http://www.youtube.com/watch?v=9dTA5ySzF60[/youtube]