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The only part of my kit that doesn't require double a batteries is my head lamp. It uses triple a batteries. I want to change this out with my plans for charging power in the middle of nowhere. I'd rather just carry a single solution rather than multiple.
Any recommendations?
I have 2 types of batteries to cover all of my needs, double A and CR123. That being said, I have both types of batteries in rechargable form along with a PV panel to recharge them
I'm trying to only utilize one type of battery size. That really didn't help all that much.
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I use a 4-AA Princeton Tec headlamp like this one:
http://shopping.yahoo.com/761528003-...dlamp-granite/
It is a halogen light and is very bright but has only a 3.5-5 hr burn time but that is long enough to find a place to hunker down until daylight.
Because of that, I also carry a Petzl 3-AAA LED headlamp that, while not as bright, will last longer. It's a small very packable item that I like to have for back up.
I'll trade the short battery life on the Princeton Tec for the brightness, which I like having. I've tried keeping all my batteries the same but can't because the equipment I like and trust the most simply do not run on the same type of batteries.
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Not too crazy about that type of headlamp with the battery pack in the back. The wires can become loose or snag on something.
Nevertheless, I can't argue with the burn time and brightness. I could argue with the price of $75 ( more or less)though.
If you are going with rechargeable batteries, you can by adapters that fill the space of a AA using a AAA, http://www.greenbatteries.com/battery-adapter.html or they have chargers that charge both sizes.
I also prefer electronics that use one type of battery and also prefer AAs since they're so common. I'm sorry I don't have a headlamp recommendation but a Google search came up with some links I think you'd find interesting.
http://www.amazon.com/Energizer-Micr.../dp/B002M3PMCE
http://www.fenixlight.com/viewproduct.asp?id=116
http://www.backpackinglight.com/cgi-...hread_id=27148
Concerning runtime my plan is to get two single AA high lumen tactical lights for my wife and I, mostly to save weight and yet have a lot of light. My current 2 AA updated Maglite puts out 160 Lumens which i have found very helpful hiking down a mountain in foggy, rainy, night. A high lumen single AA might have shorter runtime than a double AA, but who cares? I'll be carrying spares.
Good luck in your search.
There is always the option of changing everything to AAA.