Introduction
In some cases the battery block / stuck extreme hard inside. You can push it out, with a appropriate tool.
guide "JBL Flip 4 Battery Replacement" for blocked (swollen) battery.
A precise study the of the guide JBL Flip 4 Battery Replacement is required before starting (there are lot of useful comments). _
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Unscrew the USB-Modul.
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Tilting the USB-Modul a bit (example: around 30 degrees)
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The battery should be more visible now (image without battery).
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or alternative remove the whole USB-Modul.
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black flat flex / ribbon cable (here in image white) directly behind the USB-Modul,
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black flat flex / ribbon cable (here in image white) across the flat,
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thin microfon-cable, which rip off easily. Pull adhesive tape careful down.
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Put the tool carefully on right side of the USB-Modul in. It's not allowed to be blocked by something. Nor on the side or down side.
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The image shows the tool, after the battery was pressed out.
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Maybe you can use a alcohol liquid to improve gliding properties. It will evaporation residue-free (in opposite of oil). If there are some glue remains from before, that can be also removed more easier.
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The old battery are mounted by sponge rubber. By the bloat / expansion of the battery it's to big to push / pull out the old battery.
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To improve mount, you may can add some rubber band to the battery. That will results the same like sponge rubber. It may also prevent too much heat at the battery.
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The new battery is perfect centered in position.
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Sort the battery cables: None of the cables inside should be upon the other.
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Put the cap back.
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If you have bad luck: The cable to the button may be damaged, while working. Follow this guide to replace that cables.
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To reassemble your device, follow these instructions in reverse order.
