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

These rechargable batteries and charging unit have saved me untold agrivation from dead or untimely battery failure. One of the worst was needing to take a last picture or two and have the batteries die in the camera and no new ones available.If you take pictures with modern high power consuming cameras with big memories, you will need one of these. This kind of agrivation will be a thing of the past.