Lithiums are a no brainer for significant, extended use - they are dependable, lighter, worker better in the cold, and do not leak. With their terrific energy density, they are actually cheaper in use than all but the cheapest alkalines.
Yep, plus their shelf life is excellent. If you keep an eye out there are coupon deals on Energizer lithiums every so often.
I use only lithiums in the field. Sure wish the SPOT-2 used AAs instead of AAAs since my GPS and headlamp use AAs. Oh well, an extra set of lithium AAAs is not a burden.
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