Kobo have tweeted that the battery life is "improved". Obviously no numbers and we will need to wait for a teardown, or the FCC to publish photos of the internals, to know if the battery size is increased.
The CPU's different, and may also be more efficient.
FWIW on the ppi front, I upgraded from an Aura @ 217ppi to an Aura One @ 300ppi, and the difference was noticeable. However I might hold an ereader closer to my eyes than I'd hold a tablet, so possibly the 227ppi on the Elipsa 2E is not relevant. Possibly.
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