Instruct: Classify the given Amazon review as either positive or negative.
Query: Another dead battery!

I bought the set from Costco around 18 months ago and they have all died. Phone will show full charge and a few seconds after being picked up will drop connection and show a dead battery. This happened with two of the handsets and I thought the third was ok, it has hardly ever been used, but now it's showing the issue as well. Even though the handset has never been used, ok maybe two hours in 18mo, it also has the problem! Did Vtech build in a kill timer?? I'm never buying from them again.