Aux power questions

[SDG]

Was looking for some replacement cigarette lighters to swap them over to USB chargers, and this popped up. Thought it may be applicable to what you are looking at doing, and its pretty cheap.

https://www.amazon.com/gp/product/B077XF3H8B/ref=ox_sc_act_image_1?smid=AXLVUUCJK6134&psc=1