Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dead Battery - Dead Toy - Dead Customer Service

Fortunately, my wife did discover that you needed the $35 flexpak battery when she bought the Terrain Twister before Christmas. She wasn't happy, but she bought it. Unfortunately, the battery pack never worked, and neither has the toy. It's worthless. My wife has been trying to return it through customer service, but was refused - and harrassed - by Tyco who accused her of "burning up the battery by plugging it into the charger wrong or leaving it plugged in longer than 5 hours". First of all, it's possible that we plugged the battery in backwards into the charger, since it will fit both ways. As a degreed technical manager in an electronics field, I'll say "bad design". Second, since when has there been a battery charger that you can only leave in for exactly the amount of time and no more? No more Tyco for our household and for our disappointed son.