Every time I try and teleport a batch it seems to work for a second before displaying "synchronization lost". More than enough power in both bases, so I am not sure what is going on

Synchronization is lost when one teleporter gets more than 2% ahead of the other one. Are you using any mods that affect beacons? Teleporters are not normally affected by beacons but if a mod changes this then it might be getting beaconed and getting out of sync.

For example, I have a mod that changes the behavior of beacons to accept all types of modules. Speed, production, etc. I give everything quality, both beacons, modules, buildings.

I'm also struggling with this synchronization problem. It seems to me that there is absolutely no explanation why it doesn't work. Couldn't a normal message be used for why it doesn't work, other than that the synchronization was lost?

What kind of message would be more useful to you?

For the moment, I've added a debug mode to 1.0.12, which can be enabled via a setting. This will dump some information to the console when a teleport fails. It may be more informative, but even if it doesn't directly help you, you can screenshot it because it will help me figure out what is going wrong.

OK, then I can try.

So I assume that you are setting this message with synchronization. I didn't look at the script, but I would expect an IF and an "error" message. For example, an error (if it is quality problem) that "The receiving teleport does not match the quality of the sending teleport." or similar types of messages.