How do I change the batteries on the Rival 3 Wireless Related Searches Mice SteelSeries Slide the Battery Cover down to remove it. Insert either one or two AAA Batteries (included) into the Battery Compartment(s) with the minus side first. Slide the Battery Cover back onto the mouse Related articles How do I check the battery level on Rival 3 Wireless How do I connect my Rival 3 Wireless using Bluetooth? How do I re-pair the Rival 3 Wireless? How do I optimize the battery life on my Rival 3 Wireless? How do I reset my mouse?