Eastmall has a 5 volt passthrough for their Indulgence mod. *see quote below*
"with the usb passthrough plus our manual switch for indulgence and the end caps, you could make it compatible with dse801 ,dse901, joye510, 302, kr808d-1, and the 901 cartomizer, 510 cartomizer at 5V."
Note: I...