My experience has been that as long as they are under the output rating (which steadicube is) and are attached to a piece of equipment, charger, camera, etc. It is not a challenge. We also don't call attention to and just say media cases. We spread them out when we can so that if a case misses we don't miss all the batteries, but we don't deviate much from our normal pack.
In all of the flying that I do, I have only had cases not make it once. The one time it happened, none of the gear made it. We figured they didn't check the oversize line or the skycap was slow. They all arrived the next flight in only a couple hours later. We didn't need everything until the next day.
We are fortunate that we don't take last flight, plan time if we can in case something doesn't make it, etc.
For international we always plan an extra day if possible. It can sometimes take a minute to get through "the process", delays, etc. on the other end. I am also sure you are flying with a Carne like we do so it should be simple.
If production is working a broker for everyone, it should be very simple.
Anytime you need a second, let me know I will come schlep cases to be able to learn from you!