I have an amazon prime card. I posted that I purchased a battery and it failed 10 days out of warranty. DJI would not help out. I contacted Amazon and I was advised that because I paid with my prime card, they will refund the full amount and accept a refund on the battery up to a year from the date of purchase. I did have to show them it had only been charged 13 times but I could not be happier with amazon!