I'm thinking of building a floatable speaker to float along beside me in a lake or a small river while tubing. I've got some speakers and the following 12V amp:
and I was thinking of using a power bank capable of 12v output to power it, such as this:
I was thinking of putting this all in a waterproof pelican box, drilling holes for the speakers, and putting a thin plastic membrane over the speaker cone to prevent water getting in, and throwing in a silica gel packet to absorb moisture. The speaker cones would also be covered by a metal mesh to protect the plastic membrane, and they would be silicone-sealed to the waterproof box. I'd have this floating along with me in a small river or a lake. Theoretically, no water will get in. So my questions are:
If water does get in, is it going to harm anyone in the water? I can accept damage to the hardware, but I want it to be safe.
I know lithium batteries don't mix well with water, and I think that's what is inside of power banks. I've seen waterproof power banks, but the only ones I can find can only put out 5V. Is there a better and safer power source?
Is this totally unsafe?