How do I change the batteries on the Rival 3 Wireless Products 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 What kind of batteries does the Rival 3 Wireless use What is high efficiency mode on Rival 3 Wireless I lost / damaged my Rival 3 Wireless Dongle Rival 650 Setup