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on November 27, 2013
Lithium Cells are rapidly becoming the new gold standard for many household uses, from simple flashlights to sophisticated hybrid vehicles. These lithium-ion batteries are now ubiquitous in the retail arena and their popularity has steadily increased because of their power efficiency compared to more traditional delivery technologies far surpassing carbon-zinc, nickel-cadmium, nickel-metal hydride and alkaline.

Here Is my Assessment of The Energizer "Ultimate" Lithium AA Cells:

PROS:

1. Superior in overall power efficiency compared to traditional battery technologies. Lithium cells retain their charge longer and become superior performers in retaining their charge. When stored properly (in a cool, dry and dark environment), these cells self-discharge rates are substantially slower compared with previous generations of batteries.

2. Unlike nickel-cadmium cells, lithium-ion batteries have no (or a very negligible) "memory" effect.

3. Lithium-Ion cells also perform better at lower ambient temperatures than their predecessors.

4. Lithium-Ion batteries are noticeably about 33% lighter than previous types of cells making it an additional plus in heavier types of equipment such as larger flashlights, power equipment, etc.

5. Energizer lithium cells (and all lithium-ion batteries in general), have expiration dates considerably longer because they discharge much more slowly compared to previous generations of batteries.

6. Lithium cells are more environmentally-compliant and friendly compared to previous generations, particularly those cells which contain toxic, heavy metals such as cadmium and mercury.

CONS:

1. My rating on these particular cells is 4.5 stars due to the perceived steep price points of the Energizer brand. However, if you do the math, as another conscientious reviewer has, you will find that lithium cells are actually a more cost-effective choice when compared to an equivalent-sized alkaline battery. Nevertheless, you are still likely to pay more for a name brand such as Energizer, in order for the company to recoup their research and development costs. By the way, the AAA and 9V platforms still tend to be more expensive compared to their AA, C and D counterparts-This appears to be valid regardless of the type of battery technology (e.g. alkaline, carbon-zinc, NiMh).

2. Lithium cells may be a safety hazard, particularly when exposed to high temperatures for sustained periods of time. For this reason, the federal government has imposed transport restrictions on lithium batteries. Although these restrictions have recently been relaxed, lithium cells can and do explode because they contain a pressurized, flammable electrolyte. For this reason, it is advisable to store these cells in a temperature-stable environment.

3. Energizer currently has several different "quality tiers" of Lithium batteries on the retail market-each with a different price point and different retention claim (i.e. "Lasts up to....x longer). For example, Energizer currently has three discrete lines within lithium cells: Energizer "Advanced" (retention claims "up to 4X longer" in selected devices); Energizer "Max" (retention claims up to 8X longer" in selected devices) and Energizer "Ultimate" (retention claims up to 9X longer" in selected devices). For the relatively modest difference in price and at more than twice the retention claim, my choice would be Energizer Ultimate.

Be careful to select the latest available expiration date card(s) to avoid purchasing an earlier production lot of the product. Each cell also has a production/ lot code embossed on it; however, they are not at present, user-identifiable without assistance from Energizer.

BOTTOM LINE:

1. These are excellent batteries when used properly and in the correct equipment. In consideration of the longer storage and discharge interval, my recommendation would be to use lithium cells for those appliances and equipment requiring longer replacement intervals such as fire, smoke and CO2 detectors; water sensors, outdoor sensors, digital cameras and remote controls to name just a few.

2. Avoid storing these cells in extreme temperatures-cool, dark and dry is recommended for maximum shelf life and safety. Avoid storing lithium cells in the refrigerator or freezer.

3. Energizer's lithiums are, in my opinion, no better than those manufactured by other reputable companies. As such, price shop. If store (generic) lithiums are available, shop prudently with your wallet. This is an excellent technology but there are deals available on these cells if you shop patiently-both online and in-store.
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VINE VOICEon May 14, 2016
I use these in my hardwired battery back-up smoke alarm. Most battery back-ups are 9V, but the First Alert dual ionization alarm I own takes AA batteries. This sure beats climbing up to change out the batteries once a year.

These must be imported from Canada as all package printing is in both English and French. The reason for one star deduction is because of no "Best if used by" date. However, since the bottom of the package has a copyright date of 2015, I can assume that's close to the date these were manufactured.

I expect to get at least 5 years out of them to be on the safe side since it's a smoke alarm and not something else less serious.
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on December 14, 2014
Almost 100% of our AA and AAA battery use is with Eneloop rechargeables. But for the few cases where we want a light weight disposable (hiking), this is the only one we buy. In very high load gear, they can last as much as 10 times as long as the best alkaline though for a very light load, they have about the same life.
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on February 28, 2017
Lithium are the best. Long lasting and great shelf life.
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on November 29, 2016
The only batteries I even bother using anymore, I prefer these.
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on February 26, 2016
I installed on battery in my outdoor thermometer sensor, and I will keep track of whether it actually lasts longer than a conventional battery. The temperature range where installed ranges from 15 F to 90 F at the extreme.
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on June 18, 2017
great
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on April 20, 2016
These batteries lasted about 2 months and a half, in a digital clock. Regular Alkaline Batteries last about 2 months, this says in the packaging it should last 9X of a regular battery (Alkaline??) defective? Maybe... I am just not satisfied about the performance of these batteries.
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on December 7, 2012
This is the battery to buy for use in those applications where you want to "set it and forget it." Or where you don't want to be having to change batteries at inopportune moments (like a digital camera). My particular use is for a indoor/outdoor digital thermometer. The outdoor sending unit is subjected to heat extremes and need to function even in subzero temps.These batteries will last several years there with no problem. Easily woth the extra money.
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on November 17, 2012
I use these batteries in my digital camera, and I never imagined that batteries could last so long. I've faithfully purchased these for the last couple years and ill continue to purchase them! and I take a moderate amount of pictures, maybe using the camera 2-4 times a month, but with young kids, I sometimes take 20+pictures (or many more!) trying to get a good one. And on average these batteries last me 6-12 months!
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