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That's not integrated so much as they added "fins" to the downtube to make it look so - it's the exact same external PowerPack battery standard as the Firefly.
As an aside on the Trek Supercommuter: It's like one big echo chamber for brake resonance and rattles. It's one of the cheapest-feeling Bosch bikes I've worked on over the last 3 years.
One of the nicest e-bikes I've seen. Firefly make beautiful stuff. Sure it will be $$$ though!