Flume 2 Wired Battery with tight lid

I purchased this regulated 3V 2A power supply: https://evandesigns.com/products/3-volt-adapter-transformer?variant=6807227990064 .  I also purchased the matching screw thread mount from the same vendor here: https://evandesigns.com/products/power-jack-added-switches?variant=40814292434992 

I also purchased the same battery connectors that were suggested by the original author, but just removed the springs using a plyer.  https://www.amazon.com/dp/B09DSNM1Z5 

I also purchased these wire connectors to make it easy to add/remove the components.  Note this is optional and probably not needed.  https://www.amazon.com/gp/product/B07YKHV46N 

If you do use the wire connectors, I would recommend some heat shrink tubing at the wire connection points.  https://www.amazon.com/gp/product/B07WWWPR2X 

I soldered everything together as shown in the pictures.  I also slightly bent the battery connectors after removing the springs so that it would be a tighter fit in the 3d printed battery case.  I also had to drill a hole through the flume 2 plastic case for the screw thread mount.

The original battery, new, read 3.486V on my multi-meter.  The wired battery that I created read 3.018V on my multi-meter.  Over time, a battery would read lower voltage as the battery is used.  If you look at the battery meter in the Flume app, it shows only 2 bars as shown in my pictures.  I suspect that the device doesn't have logic about being wired to an outlet and just sees this lower voltage as a battery being partially drained.

Note that doing this will likely void your warranty and I don't take any responsibility for any damage you do to your own device.  However, the advantage is that you will get a no-maintenance device.  I'm a bit disappointed that Flume doesn't offer an indoor version that can be plugged into a wall outlet, but I suspect that the constant need to purchase batteries from them is part of their operating model.