Brookstone Speaker Ryobi Battery Conversion

My goal is to print this model to allow a ryobi battery to be swapped into the bottom of the unit rather than 8 D-Batteries. I am using a dc-dc buck converter with adjustable voltage and current to I can meet the 9v 2a of the speaker combined with a Bluetooth module to allow for the deletion of the radio sending unit.

*The Ryobi Battery Socket to Brookstone Plate is the wrong size so I had to significantly cut it down.* It worked just fine after but I would advise grabbing the other Ryobi socket on my page and modifying it.

Legs are made for 4ah batteries and smaller.

I have yet to run out a 4ah with an entire day of playing. And it gets really loud.

Speaker: https://www.amazon.com/Brookstone-Wireless-Weather-resistant-outdoor-Speaker/dp/B003E6NP3G