[TowerTalk] zero RFI float charger for 12V battery

[jimlux]

I'm putting some remote gear (tuner & relay boxes) at the antenna base 
that runs off a standard 12V-7Ah battery (control is via WiFi) that runs 
the microcontroller and energizes the relays, etc.  Average load is low, 
peak load is high.

I've got a nice inexpensive powersonic wallwart fast/float charger, but 
it's a switcher, and noisy.

I'm looking for a inexpensive, wall wart style charger that has *some* 
regulation (AC line voltage will vary, temperature varies, etc.), and 
I'm not looking to build something. I just want to plug it in and have 
it work.

Has anyone run across such a thing? (countless items in catalogs, but 
nothing talks about RFI.. maybe there's a key term to look for?)