This is my Trek Bluetooth speaker and it work great, unfortunately the batteries no longer hold their charge and if I'm lucky I get about 80 to 90 minutes, when new I got over 4 hours continuous use.
I have never had a issue or had to open this speaker, so this is a first for me as I am going to open it up, see what type of batteries are required, source them, and then replace them.
Come along with me for the journey.
