Amazon is not a great place to buy lipo. Many of the sellers are drop shipping from China, leaving you at risk of not getting your battery because they never accurately declare the contents on the customs form. “Free” shipping usually means the base cost is much higher to pay for it. I get all my lipo from dedicated UK based model shops or Hobbyking’s UK warehouse. UMT 850mah 3s Gens Ace 3s Tattu 3s
All of the above are good quality packs I have personally used , from suppliers I have had multiple orders from. Unmanned UAV in particular have very good quality gear.