After he stripped the N64 of its original hardware, he installed a Raspberry Pi 3 and an RC battery eliminator circuit (BEC) to get 5V out of the internal 6200 mAh 7.4V battery. [Le Nerdarto] says ...

Take for example this absolutely incredible clamshell N64 built by [GMan ... charging the handheld’s 4250 mAh battery, and providing digital audio over I2S. It’s a fantastically professional ...