Can't mail. USPS will not accept a LIPO battery..have to use UPS.Mail the batteries.
And, has to have 'their' LIPO battery sticker. You can't just write it on the box. [Just went though this with 1 of my numerous SOLO's I am selling, that went to Texas.] (Still have 2 more, 1 new/refurb from 3DR, never flown..out of box once to charge battery!) and one used, bird, flown once. I *Think* I have a rev B GPS board for it.)
I'll post in the For Sale topic with pictures of everything I have for sale.