Instruct: Classify Amazon reviews into positive or negative sentiment
Query: very poor charging system life

I purchased two sets of the SONY 925RK headphones less than a year ago. I only used one base station with the two headphones. All was well for about six months when one headphone stopped charging the battery. A month or two later, the base station stopped charging so I put the second base into operation. Recently, I lost the red light indication that this combination was charging the battery. I don't know if it is just a faulty indicator light yet. I had already purchased two new batteries, and charged them, which may keep me going for a short time.I had a chat with a Sony tech and after some discussion, she advised me that both sets needed to be returned for repairs, at my expense, since the wonderful 90 day warranty had expired.I would be happy to use a stand alone battery charger, but have been unable to find one. Any help in this area would be appreciated. Thank you.