alexkiritz

That lip is so you can screw a clear plastic endcap on and use it underwater.

Tutorial

https://trontium.com/adapter-cable-tutorial/

This isn't just a simple unidirectional converter. Power must flow in both directions.

We are also using ultra high efficiency parts and may also increase the power to over 100 watts if we can get it approved/ make it safe.

Another member of the team posted this late last night. What questions do you have? One of us will respond when we're not asleep.

You're right. That keyboard is not USB powered. That's why we're making adapter cables. I'll be posting a tutorial on the site later today with pictures, but the general idea is that you can buy an adapter cable for whatever device you have and then set its voltage requirements in an app.

https://trontalk.com/filedata/fetch?photoid=147

It has three high power voltage converter circuits which are needed for it to support USB Power Delivery. Those are more expensive than the batteries and no other device has three of them.

Lithium-ion packs are measured at 3.7 volts, not 5.