at the time we started developing the LiGo batteries the regulations were pretty clear allowing up to 20pcs of <100 Wh battery packs to be shipped without going as dangerous goods. In April of 2016 the rules got adjusted down to just 2 batteries, and since January 2017 most of the couriers (like Fedex, UPS) have an internal policy that they will not accept any lithium battery only shipment without it going as Class 9 Dangerous Goods cargo.
However, there is another category of batteries packed with equipment (not even packed in equipment) which they are happy to ship, and so lately we've been including a cosmetic defect ebike light, DC-DC converter, or other small items that can be powered off the LiGo battery. If they see that we are shipping a bike light with a couple spare battery packs all <100 Wh, then that is no problem. But without the light in there and just batteries only it has to go as Dangerous Goods (with the $60 DG surcharge, packed in vermiculite, and all that).