I think you'll get lots of responses, with good reason, on how Steripen and other electronic devices should always have a back up as electronics tend to go bad at just the wrong time.
I don't recall reading about any Steripen electronics failing. The closest is the one in this thread, where it was faulty when delivered. Personally I have similar anxieties about filters, which can be fragile or become clogged. (The blue dye thing is reassuring for people like me - it's nice when you can see it working.)
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