On Thu, 12 May 2016 14:42:50 -0000 (UTC), HerHusband
wrote:

I do have an LED lantern that runs off of 4 D-cells though. I haven't
changed the batteries in years and it's still going strong. We also have
a few rechargeable lights that come on automatically when the power goes
out.

I have lots of LED portable lights here and we have the standard
"emergency light" you see in commercial installations in the hall. I
swapped out the sealed beams for smaller LED lights and I imagine they
will run for days on those gel batteries. I do have a switch on them
so they can be turned off. That is handy if the power drops at night
and you are suddenly in the dark.