davidfor,
"if there are devices that if plugged in for a longer time won't cause wear on the battery. Personally, I think the answer is all devices do this, but maybe some are designed differently"
Yes, a fine way to put it. The issue is to avoid (unnecessary) use of the battery when the unit is on AC power. I was under the impression that out of portable devices only laptops and netbooks were designed with this in mind. The conclusion seems to be, most do it and the proof is in removing the battery if possible and trying it.
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