I can't get why a little distorsion on the battery case, seems not related to it, but to something else. What happened if you try to squeeze and force pulling or pressing a bit the battery while the anafi is on ?On its own, it switches on.
I Can see that the plastic clipsing part at the top of the battery has some issue.
Any advice to fix it ? (Tried to presse it several Time to "unblock" it).
Yes you're probably right. Will I take the risk to use It however? So far I've used 2 batteries max when I go out never 3. This one will be my 3rd one.Fresh water, as you undoubtedly know, is a lot kinder to electronics than salt water but I still believe that the source if your problem is that water damage has affected the electronics inside the battery.