A RZR smart battery is A smart battery isolator is the simple logic but but perfect technology using voltage to automatically isolates battery . These units can be installed between batteries with a common ground to automatically control the charging process to the batteries but continue to provide isolation when a charging source is unavailable. The small size and rugged construction of these units allow for quick simple installation for even the most novice DIY Isolator is the simple logic but but perfect technology using voltage to automatically isolates battery . These units can be installed between batteries with a common ground to automatically control the charging process to the batteries but continue to provide isolation when a charging source is unavailable. The small size and rugged construction of these units allow for quick simple installation for even the most novice DIYer.