From my understanding, the issue with lithium ion batteries is that the crushing alone isn't enough to cause a fire. The problem is that incorrectly manufactured or damaged lithium cells can actually cause the battery to burst at high altitudes (a cargo hold pressurized to 7000 ft. is still enough to burst a defective lithium battery).
In Hawaii, the only ways to transport via ground are USPS Parcel Post or sea freight. And even then, you still need this label on your packaging:
I'll stop by the post office either tomorrow or Friday and try to get a clear answer from the clerk (they've been really helpful with all the other questions I've had). And if there isn't anyway to send them economically, perhaps I've discovered a new revenue stream for myself!
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