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Once again Onyx (Boox) confuses the heck out of me with their almost arbitrary spread of products.
TLDR: "Plus" means a 25% bigger battery than the non-plussed. They can probably get that small a jump without increasing the volume of the battery. So they don't even have to change the case.
I would guess that the dividing line between "frugal" and "greedy" battery consumption would be whether the device uses "BSR", the "Boox Super Refresh".
I've speculated before that the Mira displays had to implement a way to take in HDMI video and display it on Eink. That's a bit different than an ereader where you already know that this button changed and there is an rectangular update area. I'm guessing that the BSR in tablets was taken straight from Mira. It should give a performance benefit, but possibly using almost twice as much power. I'd sure like to measure it.
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