Certain Prototype PS3 controllers actually feature an LED under the PS button when plugged in/on. Model CBEH-1010. : r/PS3
3 Ways to Fix a PS3 Controller - wikiHow
PS3 controller problem (continuous 4 blinking lights) | MacRumors Forums
Amazon.com: DIANVEN for PS3 Controller Wireless for Sony PS3 Remote Controller for Playstation 3 Controller Wireless with Double shock, Motion Sensor, Bluetooth, USB Charger Cable, 2 Pack (Black) : Video Games