Have there been studies on which manufacturer's battery lasts better for the long term? I'm thinking of a comparison like they do with hard drive wear-and-tear.
I'm not after who could give me the longest "unplug time", but rather "service life". I'm not very mobile---I almost only unplug when I'm at conferences/meet-ups---but I'd like to know which one could keep up the same amount of unplug time for the longest number of years.
(I specified PC because because, for laptops in general, I think Macbooks is a no-brainer answer. Impressed as I am with Apple battery, I still prefer to work with PCs.)