We lost our power a week or so ago, and the usual search for a flashlight with good batteries was a pain in the A**.
In researching the Insight subpacks, I had to remove a weak cell from the stick to examine it. That left 5 pretty good D cells, the only problem being that they are welded together. I carefully used a dremmel grinder to grind off the welds, and in the end had 5 nice high rate NIMH cells. A few short pieces of heat shrink, and they were ready to be put to work. I installed them in a cheap LED emergency lamp, and made a small 4 cell solar charger.The solar panel current was passed through a diode so it would not discharge the cells at night. Now I am ready for the next power outage