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I think it is a sad fact of life, at least at the moment, that Android e-ink devices simply cannot compete with Kindle's, Kobo's and other e-ink devices using operating systems (usually Linux based) highly optimised for e-reading. Android e-ink readers are basically e-ink tablets, and you should expect the battery life of a tablet. Whilst there are some improvements you can make by shutting down some Android Services, installing CPU throttling apps etc, the improvements are usually marginal. There is I think some talk of this in the Onyx T68 and Boyue/Icarus Illumina threads.
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