MrClean
Hardcore RCTalk User
I'm sure this would apply to Li-po batteries also. Looks like it'll be even more expensive to overnight any lithium based batteries and for ground service they even require special markings. I haven't gotten into the electric side yet, so you all might already be aware of this............ or it might not even apply to the batteries used in electrics, in which case, I'd be talking out of my rear (as usual). 
I was checking tracking on a package I sent and found this article on the UPS site: http://www.ups.com/content/us/en/about/news/service_updates/battery.html
I was checking tracking on a package I sent and found this article on the UPS site: http://www.ups.com/content/us/en/about/news/service_updates/battery.html