6 X AAA Rechargeable batteries 550mAh NiMh Philips SBC HB550S Head phones $12.46 - PicClick AU
Amazon.com: Customer reviews: Philips Wireless Headphones for TV Watching with Home Cinema Sound and Low Latency, Wireless TV Headphones with Bluetooth USB Transmitter Over The Ear Bluetooth Headphone Easy to use, 18h
Philips Rechargeable Battery AAA - 700mAh (4 Batteries): Amazon.co.uk: Health & Personal Care