https://electronics.woot.com/offers/battery-head-strap-compatible-with-quest-2z-1? Yoges 5000mAh Oculus Quest 2 VR Compatible Rechargeable Adjustable Battery Head Strap on sale for $29.99. Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is $6 per order.