I bought this but found that it’s unfortunately no longer sold:

Specell Charging Case for iPhone 6/6s/7/8/SE 2020 Upgraded 3200mAh Slim Portable Battrey Case Rechargeable Extended Battery Pack for Apple iPhone 8/7/ https://www.amazon.com/dp/B08TH9BYGQ/ref=cm_sw_r_cp_apip_h7QhmTcNpxRx2