The Sony NWZ-B172F is a legendary device in the portable music player world. Released as part of Sony’s iconic B170 series, this tiny, clip-on MP3 player was famous for its "ZAPPIN" technology, bass boost, and incredible battery life—up to 18 hours on a single charge. However, if you are reading this article, chances are your beloved Walkman now dies after 20 minutes, refuses to turn on unless plugged in, or simply shows a black screen.
You will see a small black or silver pouch—that is the battery. Follow its red and black wires to the motherboard. You will find a (JST connector). sony nwz-b172f battery replacement