Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: I think the batteries don't work for more than 1 rat

When I purchased this device I sat it outside with dog food inside. After a few days I did catch a rat. Unfortunately after that, the rats simply went inside, ate the food, and left. I tried changing the batteries (4 D batteries) and caught another rat. Now, again, the rats simply go inside and have a feast. I think that with the cost of batteries, there must be a cheaper way!