The design revision for Talisman V2 includes the ability to replace the rechargeable battery without the need to solder. The Talisman V2 uses a plug in connector between the battery and the main circuit board.
This will allow the installation of a replacement battery without the need to solder the two battery wires. The actual ability to replace the battery will depend on the case encapsulation used and choosen by the various artists.
In theory it should be possible to cut and peel away any silicon rubber case from Sugru. The actual reality of being able to remove whatever case is used is questionable. However assuming the artist’s case can be removed, the use of a connector removes the earlier requirement for soldering the battery.
The images show the battery with the plug on the end of the battery wires, and the white socket that is soldered onto the main electronic circuit board.