> some water seems not to have enough electrolyte content to be registered by the Steripen
Known, albeit rare, problem for the Adventurer. That's why the Adventurer Opti is a better choice.
> It would occasionally just not light up at all, and often light up briefly, to be followed
> by an error (red light
> increasingly difficult to turn on (it would turn on and immediately turn off),
That sounds like an inadequate battery to me. Happens all the time with cheaper batteries. What brand were you using?