That's a shame to hear, I don't understand why it wouldn't be possible to manufacture an empty cage for users to put their own batteries in. Even if it resulted in reduced burning time (due to imperfectly balanced cells), it would put the D630 way ahead of your competitors (such as Halcyon or Light Monkey) as it would allow users to very quickly change the batteries, using readily available 18650 cells.
If a empty battery cage (based on the current D630 powerbank/battery pack format) was released as an optional extra, I am 100% sure you would gain a substantially larger amount of interest from the technical diving community (especially the expedition/caving communities).
The D620 has already proven a massive success in the technical community, and the D630 could be so much more if it kept the same ability to change batteries.
Either way, I am very much looking forward to this torch being released and I cannot wait to dive it!