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My experience with the PRS-505 has been that the battery never drops below 3 of its 4 bars. I'm sure it would if I went on a vacation away from a computer, but for me--I wind up plugging it in to the computer at least once every few days, and that's enough to keep it charged.
It reads PDFs natively, but some read better than others. It can rotate to landscape easily, and that's the best solution for most complex PDFs, or image-heavy ones. It doesn't have zoom; it has reflow text--and how well that works depends on how well the PDF was designed. (Or whether you have the ability to edit it. I can use Acrobat Pro to add tags when they're missing; you may not have that ability.)
Reading letter/A4 PDFs will usually require rotating or reflow, unless you have a high tolerance for very small text. (However, skimming without rotating is possible, or checking for a known reference.) Reflow is definitely easier to read--when it works. For PDFs created from Word, and probably from other word-processing programs, it works great. For PDFs made from InDesign, it's hit and miss, depending on what settings the publisher used.
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