Spark battery has two black grips on the side of the battery. These grips slide foward under finger pressure to release the locking tabs on the battery. If these lock tab don't completely release the battery, they may become worn or broken when the battery is removed. the DANGER is the battery may not become completely locked onto spark and could fall off in flight as mentioned on several threads. Operators should pay close attention that grips have slide first, then remove battery.

Thanks for sharing with us. A fully pre-flight checklist is always recommended before take-off.

I wish I had read this thread BEFORE it happened to me! (Fortunately my drone was not injured in the least )

That sounds like a POST flight checklist item.

My Dji Spark drone locking button not work and battery does not remove and drone password not remember to me so how i connect wifi and fly