If the batteries go dead the kids, wife and I will either stop shooting or just switch over to another gun for the rest of the evening. I'll grab a set next time I'm at China-Mart, or carry an extra set so it doesn't interfere with the fun. The specs for new batteries are Max brightness is 120 hours, and Min is 3400. Night vision is 4200, 4600. We're not going to shoot more than an hour tops with the AR...more like 20 minutes maybe 100 rounds.
However.com if I were wanting it for tactical uses, I will be able to co-witness it either 1/3 or fully. But I'm not a LEO and this isn't a serious HD weapon. If this gun turns out to be reliable I may consider keeping it out of the safe and nearby the bed. Time will tell...
The whole purpose in my AR is to make it basically a centerfire family gun. It's only the 5th centerfire rifle I own, still have over twice as many shotguns...LOL Something besides my bolt 22's and 10/22 that the wife and kids enjoy shooting already. One we can all enjoy, I think the red dot would be best for the kids, all I have to explain is "Put the red dot on the target"
That being said, I also don't want to buy an el-cheapo piece of junk, but at the same time I don't want to spring for a optic that's the price of another nice sidearm, or another AR upper (6.8) for hunting (that's really what the AR acquisition was/is really about.)