I think this is a solid battery; however I received it at 57% instead of the 99% I usually receive, the battery also had damage on it in it of itself. It still works. It's just somewhat disappointing to see that the battery has damage and wasn't at a full capacity. This isn't going to prevent usage of the Taser as it still fires normally. Just know they're not rechargeable. And that means less usage of this battery life in the long run