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So the much bigger capacity (39% more) likely more than compensates for the extra front light power needed for most people.
My newest phone achieves ereader reading time performance by having a 5000 mAh cell! Most of the insides must be battery. I had a 10" tablet with only 4,800 mAH, though my Lenovo Yoga with the bulge was 10,000mAh! The replacement 10.9" tablet is faster, longer run time and only 8,000 mAh. So it's not just about battery (cell) capacity but many factors.
The big advantage of a mono eink is being able to use ambient light, so colour temperature always matches and no unexpected brightness changes. Without a front light it's most like reading on paper. Also with no front light, no WiFi and no BT on eink the total power consumption is almost at sleep / off levels while you read a page.
I'd like to see a new Sage with no power cover magnets and a new Libra, both with bigger batteries so you could read for nearly a week at 8 hours a day. Right now some phones and tablets are catching up with eink ereaders if you have front light, BT and WiFi on. Certainly the phones win on run time for audio books or music as they power down screen and backlight and the eink ereader is using about as much power to do audio (which needs BT earbuds / headset). My newest phone still has the power saving and higher audio quality 3.5mm jack (and good €12 wired earphones can beat €70 BT and don't need charged).
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