[Jon Stratis]

For our battery terminals, we use locking nuts to help ensure they won't come loose, and some heat shrink. These get checked multiple times per season (beginning of the season and before every competition) to make sure they haven't come loose. If any do (we've only had a couple that have over the past 6 years), we cut away the heat shrink and completely redo the connection (with new heat shrink as well!).

Our feeling is that heat shrink is slightly safer, as it's harder to accidentally remove than electrical tape. That said, there's nothing wrong with using electrical tape, so long as you ensure everything is covered and make sure the tape doesn't start pulling up!