For the Dash, surely it can't be that hard to replace the soldered-in battery with a couple of spring terminals so it can be easily replaced in the future..
The outer case is fused together and the battery inside is smothered in cement. From the photo, it looks like trying to remove it also destroys a bit of the plastic cradle. And at $4.99 a piece there are better, cheaper ways to do things.
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?