BOBOVR M1 Plus Head Strap with Battery,Compatible with Meta Quest 2,Elite Strap for Enhanced Support and 5200mah Hot-swappable Battery Pack Design – BOBOVR
Oculus Quest 2 Elite Strap With Battery and Carrying Case Review: Elite and Essential
Amazon.com: KIWI design Comfort Battery Head Strap 6400mAh Compatible with Quest 2 Accessories, Battery Pack Elite Strap Replacement for Enhanced Support : Video Games
Oculus quest 2 elite strap with battery – Games corner
Amazon.com: AUBIKA Head Strap with Battery for Meta/Oculus Quest 2, Extend Playtime&Counter Balance&Fast Charging, Adjustable Elite Strap Replacement Accessories : Video Games
Amazon.com: Head Strap with Battery Pack for Oculus Quest 2, APZDY 5000mAh Fast Charging VR Power,Lightweight with Adjustable Elite Strap for Enhanced Comfort and Playtime in VR, Accessories for Meta Quest2 :
Quest 2 (Oculus) Elite Strap with Battery for Enhanced Comfort and Playtime in Virtual Reality VR - Walmart.com
PSA: It is pretty easy to attach a battery to the elite strap : r/OculusQuest