While Apple’s modern iPhones pack a lot of battery power, some users still have a valid need to both charge and listen to their iPhone at the same time — something that’s been trickier with Apple’s recent removal of the headphone jack. While adapters have been available for a while that split the Lightning port in two or provide a Lightning and 3.5mm audio jack, Vinpok’s new Duo 2 Cable takes a more interesting approach;…