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I could rig something up to only turn the charger on when it drops below a certain level and turn it if off when it reaches 100%
Most 21st Century stuff already has that logic built in to the device or the charger. Not much that's modern even uses NiCd or NiMH cells, which are the ones which are fussy about being on-charge long term.
gbj_tester-
Would it be the case that NiMH cells are happy with an intelligent charger (Technoline BL-700) which supposedly monitors and controls the amount of charge current the cells need?
I have two of these chargers, with batteries in them on a permanent basis. I've had no fires and the batteries have always been fine when I've taken them out to use them.
JurekB
Is it still the case that leaving battery powered stuff plugged in permanently is bad for the battery (a sonos speaker in this case)?
I could rig something up to only turn the charger on when it drops below a certain level and turn it if off when it reaches 100% but don't know whether that is actually required or not.