Hello, I would be flying united airlines soon to go on a trip . I was wondering what the rule was with their battery policy for DSLR cameras, I tried looking it up but couldn't find the answer I wanted . What I was wondering is, I have 2 DSLRS , 2 batteries for My canon and 3 batteries for my LUMIX GH4. So could I bring those batteries all in my carry on or do I have to give some to a couple of friends of mine if they have a max amount rule . And also, can I carry Triple A batteries or Double A batteries ? Thanks for the help
I haven't flown United in quite some time...and don't plan on it since I'm not really partial to being on the receiving end of a beatdown. That being said I think most airlines are at least somewhat similar in terms of what they will and won't allow in terms of batteries.
Standard batteries like AAA and AA shouldn't be a problem unless you try to bring a ridiculous amount. Like I think 10-20 would be okay if you can prove you have devices that require them--like my X1T-N, X1R-N, Goxox TT685N, & Nikon SB-500 all together use 10 AA batteries. So, even if you figure spares that's about 20 batteries which I think should be okay unless you run into a TSA agent who hasn't had the opportunity to engage in relations since the Bicentennial

. However, if you bring a gross (144) of batteries, you'll likely raise suspicions. Make sure all of them are in no danger of shorting--like keep them in their pack or tape the terminals with electrical tape.
For the camera batteries, just keep them in your carry-on baggage and protect them from a short circuit; the Nikon batteries I have have a plastic cap that does this--if not a simple piece of electrical tape should accomplish this.
Anything lithium (Li-ion, Lithium metal, LiPoly, etc.) needs to be carry-on. However, I don't think this should be an issue. You're probably going to want to carry-on your cameras anyway, so just make sure your batteries are in the same case/bag/etc.