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One tool I find very useful is to run the Accubattery app. It will tend to dissappear from the list of running tasks because Onyx is very aggressive at removing anything that is not a system app, BUT if you can make a point of starting it when you fire up your device it will eventually give you a battery health number (as a percentage), which may give you some idea if your battery is knackered. It probably is, based on what you've said. These devices are designed it seems to fail in the power department! Like Markismus I've added/changed batteries on Kindle and Kobo devices and its been fairly easy so far.
Best bet IMHO is to replace your device with a new one when Onyx are in an upgrade cycle, roughly every six months. This means they will be flogging brand new 'last year' models for much less money. There is virtually no difference in everyday performance with anything from a Note Pro up to a Note3. Better to trade up before your device blows up, just don't buy the latest device in the lineup, get the one that Onyx are trying to clear out of their warehouses.... and there is a ready market for people who don't want to spend a lot of money on a big screen eReader new, but who are prepared to buy one secondhand that may be end of life.
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