So, if you're wondering how long the batteries last in the NightStar 2x42 Gen-1 Night Vision Monocular, here's the scoop. This monocular runs on CR123A lithium batteries, which are known for being pretty reliable and efficient.
From what we've found, you can expect the batteries to last around 40 to 50 hours if you're using the device continuously. But keep in mind that the actual battery life can change depending on things like how often you use it, environmental conditions, and whether you're using the infrared illuminator.
Using that infrared feature tends to drain the battery faster, so just a heads up for your night adventures. According to the manufacturer's description, the batteries should perform well within this range, but if you're out in the cold, remember that can shorten the battery life too.
Installing the batteries is pretty simple. You just need to remove a small plastic cover, maybe with a screw involved—at least that's what our research says. It's best to turn off the monocular before swapping the batteries.
Just unscrew, pop in the new ones, making sure they face the right direction, and screw the cover back on. If for some reason the device doesn't power on with fresh batteries, it might be worth checking if the battery contacts are clean and free from any obstructions.
A quick cleaning could do the trick. But if you're still having trouble, there might be an internal issue. In that case, contacting the manufacturer or checking the return options could be a good idea.
With normal care and maintenance, the NightStar 2x42 should work just fine for your night viewing. Enjoy your nocturnal explorations!