Energizer Ultimate Lithium AA Size Batteries - 20 Pack (5-4packs)

Items arrived quickly and in good condition.

Good deal on batteries. Works well in Blink cameras

Work great so far!

Reading the comments from many others made me concerned that the Energizer lithium AA batteries sold here might be counterfeits. These are premium batteries and might be an attractive target for cheap substitutes by unscrupulous suppliers. Still, the subjective comments from some that the batteries failed too quickly could be easily erroneous or biased. How would I know?I purchased 20 of these batteries and decided to put one randomly selected specimen to the test. My sample had an etched code of “0716” and a printed origin of Singapore – does that mean it was manufactured in July 2016? I called this sample “0716-01”.I found a product datasheet for the Energizer Ultimate Lithium AA (L91) here -- http://data.energizer.com/PDFs/l91.pdf. One reads that this battery has a designed capacity of about 3300-3500 mAh (milli-Ampere hours) depending on the amount of current being drawn and the ambient temperature. For a current draw of 1000 milli-Amperes at room temperature, this battery is expected to run for about 3.3 hours (3300 mAh/1000 mA) before the voltage drops below 0.8 V.Looking through an assortment of power resistors in my electronics scrap bin, I found a 2.2 Ohm 5 W resistor that would do for a test. According to Ohm’s Law (V=I*R), this resistor will nominally draw about 700 mA dissipating about 1 W of power (P=I*V). At 700 mA, this battery should drive current through the resistor for almost 5 hours (3300 mAh/700 mA).The attached photo shows my experimental setup which used a Fluke multi-meter to measure voltage and a smartphone stopwatch app to measure time. I entered the recorded voltage into an Excel spreadsheet to compute the capacity and to produce the attached plots of voltage vs. time and capacity vs. time.Indeed, my sample Energizer Ultimate Lithium AA delivered a little more than 3100 mAh, near to the capacity stated by Energizer for this battery.Naturally I cannot vouch for the batteries delivered others, but I believe that I received legitimate Energizer batteries.

I’ve always trusted Energizer for my battery needs, and their lithium batteries certainly get the job done. They last a decent amount of time and perform well in high-drain devices like cameras and flashlights. The biggest plus? They’re much lighter than traditional alkaline batteries, which is great for portability, especially in gadgets that you need to carry around.That said, they’re not necessarily mind-blowing. I’ve found that while they last longer than standard batteries, they don’t necessarily outshine other lithium options on the market, especially when you factor in the price. Sure, they work well, but they’re also a little more expensive, and I’ve had comparable performance with other brands.Overall, they’re reliable and efficient, but I wouldn't say they offer anything that makes them stand out from the crowd. If you’re already a fan of Energizer, you’ll like these. If not, you might want to shop around for a better deal.

Convenient packaging

These batteries do great in any devices using lithium, batteries, including my Blink outdoor cameras. Last longer than others I’ve tried.

More than 2 years!