Even with lithium batteries, the Turbo Flash won't run the 32 hours in solid mode as TScott wishes. I run lithiums on that light, unfortunately, I forget how long they will run but not 32 hours......I seem to recall just over 20 hours in solid mode. I also use a small piece of tape to keep the halves clamshelled together. In 2015 and 2019, I replaced batteries in it once.
I have had four Hotshots. Three failed the same way, somehow they stop turning on. The fourth died unpleasantly when I came bombing down from the sheepery in Rambouillet into the Paris-Roubaix sized cobbles, which launched it off the mount and it smashed spectacularly. The Turbo Flash mount next to it survived the assault. YMMV