Loving the battery meter! You should also add this to the Digitakt internal battery thread so that the information can be easily accessed by future gear modifiers.
Great work! Be advised, the biggest problem is that you will not likely see it again without opening the device back up, and others have found that these types of battery mods are not immune from leaking or swelling.
Might be a good idea to check in on it periodically just to make sure that everything stays in tip top shape.
Cool share, thanks!