Does the SRAM Rival AXS E1 Front Derailleur Come With a Battery?

No, and that catches people out. The derailleur ships without an AXS battery, so if this is your first AXS component you need one in the cart alongside it. This version is also a braze-on mount, meaning it bolts to a tab on the frame. If your frame has no braze-on tab, you need a separate clamp, available in 31.8 mm and 34.9 mm. Worth confirming both before you order, because neither is in the box.

What you get for the money is SRAM's Yaw cage movement, which rotates the cage as it swings outboard so the plates stay parallel to the chain instead of dragging against it. Paired with auto trim, that means no rasp in the cross gears and no trim lever to think about. The narrow cage profile is cut to match SRAM's X-Range chainrings and works with 46/33T, 48/35T, and 50/37T combinations. It fits chainstay angles from 61 to 66 degrees, runs a 45 mm chainline, and sets up through the AXS app with the front derailleur setup tool included in the box.