We have some excellent electronics types reading these forums. I think you are probably one too, so I'm not too sure you aren't leading me into something way over my head in this question. I referred this to a good friend who has been working on some issues with his Parallax and is fluent in Electronish.
But isn't the answer that the switched power mode thingy has to do with the AC-DC conversion and not about being an excellent battery charger? My meager understanding is a switched mode power supply has a switching regulator on the load current to keep the output voltage steady. In the case of the battery charger part of the CCD's converter it still lacks, I think, the capability to maintain float charge dynamics for our battery's health.
How about it all you electronics nerd-types? You guys are so great on this stuff -- I just know about life safety codes and stuff and missed out on all this cool (and more useful) tech knowledge. Can you lend a pen onto this question?