Originally Posted by
vwdave
How can you legally mail lipos? Mail person always ask about hazards and such and one of the things she ask is lithium batteries
Yes you can legally mail LiPo batteries in the U.S.
Originally Posted by
Shawner85
To the best of my knowledge you can mail them but they have to go ground.
They do not have to go ground.
Applicable rules are in the U.S.P.S. Domestic Mailing Manual ("DMM") Section 601, Exhibit (meaning "table") 10.20.8. This can be found online.
I know this because I went through all this. My new postmaster insisted the LiPo batteries could not be mailed so I contacted the "Mailing Rules" department to clear this up.
To summarize the rules: No more than three "batteries" per package, no more than 20 WH per cell or 100 WH total per battery. That last part is why SMC says they will not offer a 7200mAHr 4S pack: it would exceed 100 WH for the whole battery.
I suggest bringing a printout of that table with you to the post office if you think you will have problems. Just make them do what they are supposed to do and mail your batteries.