YDS-120/150 External Battery (New) & Case

This is an external battery and case for the YAMAHA YDS-120/150, created using a home 3D printer.

I used to use the YDS with dry batteries (like eneloop), but recharging them was a hassle, so I created this to have a mobile battery integrated with the YDS.

I wanted to avoid modifying the YDS main unit, so by removing the screw indicated by the red circle in the third photo, you can integrate it into the battery case and make it one with the main unit.
*The YDS main unit, stand, and USB cable shown in the photos are not included in this product. Please prepare a USB cable (Type A ⇔ micro USB) separately.

The product includes a 4000mAh lightweight, ultra-thin, compact [PSE certified] (new) battery.
Regarding the 4000mAh capacity, in my experience, I can play for 2-3 hours on weekends and operate with charging only once or twice a month.

The remaining battery level can be checked during use, as shown in the fifth photo. There is no need to operate the battery separately during use; simply turn on the YDS switch while connected, and it will operate by sharing power from the mobile battery. It can also be operated with eneloop batteries in the YDS main unit's battery compartment.
Furthermore, the battery can be charged from the USB Type-C port on the side of the case.

Note: This case is a personal creation made with a 3D printer and may not have perfect precision.
The battery cover (a thin plate-like object) is designed to snap into the case.
*Depending on usage, the snap-fit may become loose.