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@Dammit
Ah, hadn't seen that- so yep, can be done, Calfee must have either duplicated the correct signal protocol, or just hacked up a Ui2 battery and used the wiring from that.
These instructions are pretty good for Di2 installation: http://www.parktool.com/blog/repair-help/di2-shimano-electronic-intelligent-system-installation-1