This.

Only reoccurring warranty "issue" we've seen over the years and it's totally avoidable by people taking the battery out of NV, etc. after each use.

It's frickin light out half the day, so you have time to put the batteries back in before you use your IR laser again.

Lower or higher priced does not change the advice to remove batteries for storage, except for making both manufacturers and end-users more cautious, as there's a higher investment in the product, so replacement and maintenance costs will also be higher.

As others have mentioned, something to understand about most IR laser systems is that if the switch is not turned to "OFF" (almost always 90 degrees to the left, pointing to the 9 o'clock when viewed from the top), the laser is still "ON," even if it's not activated, and thus will continue to drain power, and unlike simple LED "dots" like in many optics, a single battery is simply not going to last that long.

Regardless, the general recommendation holds true for most electronic products--when in storage (not in use long-term), it is best to go ahead and remove the batteries to prevent even the possibility of battery related failures or damage.

What I can say is that there are plenty of examples of batteries that are left in various devices while they are in active use (e.g., military issued batteries in military rifles overseas) with little to no ill effects as long as the user makes sure to switch the devices "OFF" when not being used (i.e., all during the day in most instances).

That being said, no matter what admonitions or warnings that we give end users, there is almost always instances of end users that buy the cheapest possible batteries from Dollar General and sticking it in their devices and leaving them "ON," that they then stick in the safe for the next six months because they only use their night vision/night vision accessories twice a year if that, and then next thing you know, they're pissed off because it ruined the one night shoot they had planned, and they're wanting a warranty repair. Sure, lithium battery leaks are much rarer than alkaline, but is it really worth potentially damaging your device?

Removing the battery guarantees both that you've reduced the chance of cell failure of some sort to zero, AND that you can't have left devices accidentally turned on or anything else that might cause issues, it's a redundant check to make sure your equipment and investments stay in good working order when you really need them.

~Augee