There was a recent debate about shipping in this thread:
AMP20M1HD-A Prismatic Cell group buy feeler failed attempt. There apparently is no consistency among folks calling or among various representatives of the shipping industry. To get some clarity, I decided I'd attempt shipping my dead A123 AMP20 cells to a recycling program and see what happens. For those following the question, you'll know my previous experience was dismal, but one can always hope. wb9k had said the rules are evolving and may have recently been relaxed.
So, today I packed up my 5 dead cells and took them to the USPS post office. I declared them as "LiFePO4 battery cells". I asked about hazmat, certification - all that. They said just ship it
GROUND - that's it. So I did and off the package went.