I’m sure the aegis would go all day at any wattage he would set a protank to, I use the aegis 100 with the 26650 battery and a subtank and it will run all day. If you can find one of the old ones, that would work with a single 26650 I’m sure. The two battery legend will last all day for sure though, at least running a protank, and it will go down to 5 watts, so I’m sure it will work.