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It's not got a huge battery* and a frontlight on will use much more power than a 6″ ereader.
Also avoid WiFi and BT.
If the frontlight, WiFi and BT are off it sleeps almost entirely when you are reading and wakes when you turn the page, so disabling cores or messing with CPU performance won't make much difference.
It's also likely it only uses all the cores when using the Advanced Notebook and you are writing.
The battery (cell really) life is much as expected for 8″ (more power to turn page than 6″) with the size of battery and frontlight, WiFi and BT are off. That's how I use it and find no issue with run time at all.
You probably can't run the CPU at a lower voltage. However power is related to clock speed squared, so half clock speed in theory is 1/4 power, but I'd not recommend trying it.
Being able to change the cores in use is unlikely.
[* The battery isn't as big as it ought to be. Possibly they thought that people would buy the power cover, which oddly doesn't work well. A power bank works better. Some of the Oasis (1st is 6″, next 2 are 7″) have the same flaw and also the Oasis was intended to have a power cover]
I reported your other post as a duplicate.
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