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Thanks for all this guys. Since I have an existing USB charger in the immediate vicinity with unused outlets, I think I ll stick to the original idea using the diode (got a few of those around too). In its simplest form I can just cut one end off a USB cable, drill a hole in the case and wire it in.
What I don t have is spare mains power outlets for (yet another) unidentifiable, wal-wart.
I already have a (one) lithium power bank, Michael, although I m not sure exactly what it would buy me (in my situation). I ll think about it. I don t need portability (at least right now, though it could happen) It did occur to me though, that some enterprising outfit could make a similar device in the shape of 2, 3 or 4 AA-cells (or AAA) as a drop-in replacement for alkaline batteries in many devices .. rechargeable from the now ubiquitous USB chargers. Sort of a super-Nicad/NiMh pack.