The Bose Soundlink Mini II, one of the best bang-for-the-buck purchases I’ve ever made (along with the Dyson V8 Absolute) finally started to show its age.
I got the dreaded charging warning!
The battery should last far longer than a year, so my issue was likely with the firmware. It was the latest version, so I had to experiment.
What ultimately seemed to fix the charging issue was to downgrade the firmware, reset and reboot the Mini, then upgrade the firmware again!
1, Connect to http://btu.bose.com
You might have to download the little updater software which will then prompt you to connect the speaker.
2, Once your speaker is connected and it shows you what firmware you have installed, and eventual updates, press the following keys in sequence on the keyboard
[a] , [d] , [v] , [up arrow] , [down arrow].
This will unlock the “advanced menu” which allows you to downgrade your firmware.
At this point, try to charge the speaker fully overnight and see if that worked.
This worked for me. Once the speaker was charged, I updated to the latest firmware again and it’s been good ever since.
If it does NOT work, then update the firmware to the latest version and try again and that should do the trick.