Well, I should have done it sooner but I bit the bullet and bought several packages of AA & AAA Lithium batteries! I bought a mix of Energizer Advanced Lithium and Energizer Ultimate Lithium. Can anyone advise me what the difference is, aside from price? It seems the Ultimate should last longer and are advertised to work down to -40 F, but does that mean the Advanced aren't good to -40 F, too?
Ultimate and Advanced Lithium both go down to -40 C. Datasheets at
http://data.energizer.com/PDFs/ea91.pdf and
http://data.energizer.com/PDFs/l91.pdf . Ultimate Lithium is significantly better in high-drain devices. For AA and AAA primaries, they're the only ones I buy.
The main reason I bought them was reliability.
They also store a lot longer than alkalines.
I get my CR123A batteries online from many sources (Batteryjunction.com being a favorite).
+1
Generally I pay around $1 each for solid, good quality batteries and maybe $1.50 for the best available (IMOHO that's Panasonic).
Titanium Innovations (batteryjunction.com's house brand) CR123As have been exceptionally reliable for me with 90+% of the observed performance compared to Surefire. Surefire is commonly regarded as the top CR123A primary. Reportedly, Panasonic manufactures Surefire's batteries. I've stopped buying Surefire batteries.
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