Why do celebrities publicly endorse certain consumer products? Usually, it's because some company gives them a staggering amount of money to do so. But not Jay-Z—he does it because he really believes in the Duracell Powermat battery-charging device:

And that's precisely why the rapper and entrepreneur Jay-Z signed on in January to be an investor and spokesperson.

"I believe in the future of wireless energy and I believe that Duracell Powermat is the company to bring on the revolution," Jay-Z said in a statement. "I'm partnering with Duracell Powermat because they're providing the solutions for the future."

"That's precisely why." Also the huge pile of money.

Hip hop hero!

[Mashable via Byron Crawford. Photo: AP]