The new Sony T3 has a fast charge mode that will enable you to read one more book. The device that HarryT mentioned would take care of power failure fears. Most ebook batteries seem to last several years and you would possibly pay more that the cost of a new ereader buying AA or AAA batteries if that is what you want by then, plus the weight. When you are already going to replace a device that still has working batteries, I don't follow your reasoning.
A larger format ereader that does PDF's is going to be expensive and heavier. Sony does a reasonable job, and probably the others as well for library book (fiction) type PDFs.
For organization any of them you have to put a little personal effort into them either by using calibre or the reader software. The kindle does have collections but you must register to use them. The Sony has better collections IMO and no need to register, but it does not magically do it all for you. Using calibre you need to spend time (an hour or so) to set it up and then it is almost magic from then on. Using the reader's software you must do it for each book yourself.
Helen
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