I've got a 2014 Honda Accord V6. The positive batter terminal has been corroded for several months now. I first noticed it in January but never got around to removing the corrosion until today. I removed the battery and cleaned everything off with baking soda, but now the car won't start. It seems like the battery terminal has corroded too thin to make any contact.
I would remove that terminal and fit a new one - new terminals are available at most auto spares shops.
Do make sure that you get the correct one (positive terminals are larger than negative ones) - the symbol just to the bottom left of the battery post does seem to show negative but as you say it is positive - just make sure...