Instruct: Classify Amazon reviews into positive or negative sentiment
Query: short of battery life

Their genius wireless fencing system allows for a new battery type that I cannot purchase in bulk on the internet. I am writing about the battery itself; not the elaborate plastic screw-in system. The main complaint is that the batteries never last the six months as advertised. This alone accounts for fraud in that the battteries last on average 2 to 3 months, if ever that long. PetSafe sees themselves as an HP printer company, making their profits on ink in HP's case, and non-enduring batteries in the PetSafe case. It is sad to see such great inventions dirtied by off-setting devious and untrue testimonials. Amazon should be more careful of product claims.If you tell me my Standard Schnauzer continually test the boundary line, I will tell you this is nonsense. He is smarter than his Master and PetSafe in this matter, and continually shows how he remembers his first sting many years ago when he was young, I was younger, batteries were inexpensive, and PetSafe was most honest.