I leave one plugged in at the arm rest socket at all times with an iphone plug in it just so its ready to go when i need to charge. Been doing that for 2 years now and never had a battery die. Even after being in winter storage for 4 months with the usb adapter left in it the car started fine so i cant see yours being any diffrent.
You shoudl be good to go!
__________________
2009 370z M/T - straight pipe cut outs / motordyne test pipes & intake manifold / K&N typhoon intake / ACT stage 2 race clutch & flywheel / ZEX wet nitrous / UpRev tune / stillen race oil cooler / 317 WHP N/A - 381 WHP with ZEX
www.youtube.com/danialk ///\\\///\\\ Follow me on Instagram @dankobra