Introduction
I've bought the device in 2017 and it has served me well for quite some time. I really liked the connectivity (USB, Line-In, Bluetooth) and the possibility to simply pop in a micro-SD card and play music anywhere without the need for a second device. All while being sturdy and quite water resistant.
However, after 3 years, the battery barely lasts for 15 minutes, so I had to replace it.
Luckily This turned out to be rather simple
Tools
Parts
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Unplug the battery from the circuit board. You might have to use a knife or some other tool to remove the glue that is on the connector.
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Finally, take the blue cushion-wrapping and somehow try to wrap it around the battery. Then try to attach the battery to the case using the black plastic brace and the two screws.
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Connect the speakers and switch the device on. If everything works, put everything back together.
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Please note that your device is probably not IP66 anymore, but in my case the battery again lasts for many hours.
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Arbeite die Schritte in umgekehrter Reihenfolge ab, um dein Gerät wieder zusammenzubauen.