Do I need to buy the battery from IntuBrite?

Not necessarily. Intubrite handles utilize a 3.6v lithium (or 3.7v rechargeable lithium ion) battery, most commonly used in cameras. In addition to their availability through IntuBrite, these batteries can be purchased through most battery retailers, or found online. For proper performance of the IntuBrite proprietary lighting system, a AA size 3.6v battery must be used.