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I doubt any PD Kobo audiobook exists. The text being PD, or the price being zero, doesn't make an audiobook be Public Domain.
Phones make for better Audiobook players than any eink and battery life / charge isn't an issue as screen blanks. However audiobook or music seriously impacts an eink battery life (and charge duration) seriously as the eink ereader is mostly asleep while you are reading and only takes much power to turn a page. Audio playback uses power continuously.
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