One thing I've come across is that DOT regulates shipment of lithium batteries and is quite particular about shipped weights being less than 66lbs.
Also, different states have procedures about the labeling of Universal Waste in transit. But all of this is probably elsewhere on the forum.
I'd be concerned that, with regards to third-party shipping, there might not be an adequate way to cover the shipping of multiple, smaller loads in the sale of the material. Plus, you pretty much have to tape/bag every single battery contact before anyone will buy from you and allow it to be shipped to them, in the first place (though maybe one of the forum buyers will find separation by cardboard an adequate measure, but your shipper likely won't).
I think you could stuff about 15-20 pounds into a large USPS Flat Rate box. But that's going to cost you nearly $20 and I don't know anyone paying over a dollar per pound of those batteries.
Not meaning to discourage you but shipping Li batts has never been easy for me. And with pricing between $.25-.80/#, that I've seen, it's hard to make a case for it unless you have a very favorable shipping arrangement, send more lucrative/less intensive material you can include in the load, or connect to a local yard with a healthy appetite for them.
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