Battery Replacement of JBL TUNE750BTNC headphones (how to) - YouTube
Amazon.com: Geekria Shield Headphones Case Compatible with JBL Tour ONE, Tune 750NC, Tune 700BT, Live 650BTNC Case, Replacement Hard Shell Travel Carrying Bag with Accessories Storage (Dark Grey) : Electronics
JBL Tune 750BTNC review: solid headphones, great value | TechRadar