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In general, a battery not holding a charge is a good sign it's time to replace the battery (or device if the battery is not easily replaceable). Batteries do wear out. I've got a mophie for my iPhone 7 plus. When I first got the mophie, it typically still had a charge at the end of the day, my internal iPhone battery was never being used. Now it gives out by mid afternoon. Time to order a new Mophie.
In general, turning off the wifi and bluetooth are the biggest power savings. Battery technology is improving in leaps and bounds. If you have battery problems that are bad enough that you have to really worry about, then maybe look at updating your reading device.
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