Einleitung
After about a year of intensive usage, I noticed the battery was swollen. I don't know whether it was caused by lying on it, storing it where it was bumped by other stuff, or just bad luck, but I figured this was repairable.
Werkzeuge
Ersatzteile
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Just like when charging the device, take out the Bluetooth module from the headband and disconnect it from the speakers.
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The back cover is glued in place. It's not a very tough glue, so the cover may have already shifted a bit from its place, and it shouldn't be too hard to remove.
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The module has two compartments, one for the battery and one for the circuit board. Remove both from their rubbery shell.
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You may be able to cleanly remove the two wires from the beige clip, but I wasn't confident I would be able to reconnect them, so I cut them near the battery, so I had plenty of wire to attach the new battery to.
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The original battery is a prismatic LiPo 3.7 V 330mAh with dimensions 4x28x26 mm
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I wasn't able to find one of that exact size, but since it fit even in its swollen state, I figured I could go for a thicker 6x28x23 mm battery
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Solder or twist together the old and new battery wires
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Cover the exposed parts with electrical tape
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You can test your repairs without replacing everything into its protective cover first. This can save you some frustration when it doesn't work on the first try, but requires a bit more caution when handling the circuit board.
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Long press the central button on the circuit board to turn it on. Does the red LED blink on?
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Does it connect to your device?
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Attach the speakers and try to play some audio
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Attach a charger. Does the charging light come on?
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You can look at the opening for the USB port to check the orientation (this is one place where USB-C would be a disadvantage)
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It might take some patience to guide the wires through the opening between the two compartments. In my case it was easier to turn the battery sideways.
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In my case, it remained sticky enough to not require new glue, even after several disassemblies.
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