Really tight fit
The batteries, I bought two,have what appears to be a design flaw. They do not fully insert and lock in. Definitely a block of some sort. I have two of the same drone. I contacted support three days ago with no response. I have used this brand on another drone with no problem. REVISED: After consulting experts on my drone, they encouraged me to push a little harder and I did with some reluctance. The batteries did snap in as they should. No flaw detected, just very tight. It is not my nature to force things into place. My apologies to GIFI, I am expecting this product to perform the same as others I have purchased.