Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great Idea

Who wants to be part way through a thrilling movie and experience a dead battery on their DVD player? Just plug this little battery into your DVD player, laptop, etc. and get up to an additional 3 hours of "movie time". The seller was good at their word as the battery came in its original packaging and arrived at my door in super time. All in all, this was a good experience.