Stay alert, stay alive isn't just a clever slogan, it's a good way to go thru life.
Any battery powered device or gear needs to be checked often. Heat, cold, rain, water, muck, sand, sunlight, fog, etc could have a - impact.
I'd get night sights(tritium type) as a back-up.
In the early 1990s, the NRC was all touchy about tritium & how it was used in firearms/weapons but they aren't as strict now.
I prefer Li batteries over regular AA types. I do however use the Li AA type batteries now offered. Li batteries hold up better in extreme cold.
CF