Thanks to a post from 2015 on a different thread, we finally located the reset switch. We had to pull out the bottom drawer beneath the stovetop, and the thingy with the reset switch (hubby could give you the proper technical term) is bolted to the floor under/behind the drawer. Hit the reset button and now we have battery power to the lights again, although it's a little weak. But at least we know where to find the reset button now!