What type of battery do the Findster modules use? Jane Jonson Updated November 14, 2017 15:39 Follow Findster Duo's Guardian and Pet modules use lithium rechargeable batteries. To recharge them, simply connect them to a Findster Duo charger (included in each pack)! ▶ Useful articles: Charging Guardian and Pet modules Charging problems Battery life problems Related articles What is the battery life of the Findster Duo modules? How many Pet modules can I connect to a single Guardian? Is Findster Duo waterproof? Turning the Guardian module off How do I change the modules’ clip? 🎥 Have more questions? Submit a Request Comments 0 comments Article is closed for comments.