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Rev 2 is already out and mine has spring terminals and a Duracell battery. But the case must be cracked open

Did you do a successful swap of the battery? Are there any markings on the case that designate it being a Rev1 or Rev2 battery?

Yes and yes https://mpetroff.net/2016/07/new-amazon-dash-button-teardown...

New one also uses 4x less power, cheaper battery lasts twice as long

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