Extra Battery for Ultra Custom Mice

Extra Battery compatible with Ultra Custom Wireless Ergo Gaming Mouse.  Please follow the instructions on proper battery removal and replacement guide: https://pwnagesupport.zendesk.com/hc/en-us/articles/360059979534-Battery-Removal-Guide Extra Battery for Symm mice are for experienced modders only.  For experienced modders only if you plan on replacing batteries on any other mice with this battery, you will need to open the mouse to install the battery. Please check jst connector size (PH=1.5mm) for compatibility.