Instruct: Classify Amazon reviews into positive or negative sentiment
Query: AVOID THIS BATTERY

I ordered six of these replacement batteries based on the positive reviews here. However, all six of these batteries FAIL to hold a charge for more than an hour. I replaced my phone batteries with the old originals, and the phones work fine, so it's not a phone problem.I've left several messages for customer service, and no one has returned a call. AVOID THESE BATTERIES!