Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works!

Well, what can I say, it works! Don't know whether it's better, the same, or worse than the stock battery. I just alternated the batteries each day and then used the camera. One didn't seem better than the other. In fact, to be honest, unless you do a TON of diving and recording I'm not 100% sure you'll even need the extra battery. I shot a LOT of underwater video and never got the "low battery" message. But I guess it's not a bad idea to be prepared.