New DOT regs became effective Oct. 1, 2009 regarding the shipment of lithium containing batteries. A detailed explaination is presented at: http://www.ultralifebatteries.com/do...egulations.pdf

(Note: RCU underlines the link - be aware that there is a line between each spaced word in the link if you retype it.)

What appears of importance to pattern is that the batteries we normally use fall into a category that limits lithium equivalence to < 8g / pack (as determined by 0.3 x capacity in amps / cell totaled) and <1.5g / cell This category requires certification (UN T1-T8) that ensures the battery's safe behavior in stress situations that might occur in shipping. Various limits are placed on the number of cells / packs that may be shipped in one container. There are some labeling requirements for the packaging added also. (Larger packs may be shipped (higher Li content), but more stringent requirements must be met.)

Some suppliers have certified batteries in stock and available for shipping (Tower Hobbies notes that they do) while some may be delayed until the manufacturer can complete certifications.

All this is a bit different from and in addition to the previous regulations placed upon carrying LiPo's onboard passenger flights.