: Constant 100% charge cycles while plugged in can wear out lithium-ion batteries. This "Battery Health" toggle in the JBL Portable app would significantly extend the overall lifespan of the device. User Interface
: With the JBL Xtreme turned ON, press and hold the Volume - and JBL Connect buttons simultaneously for 3 seconds. An audible voice will announce the current software version. Summary of Model-Specific Improvements jbl xtreme update firmware
If you aren't sure if you need an update, you can check your current version manually: How can I check the software version on my Xtreme? : Constant 100% charge cycles while plugged in