Energizer L91BP-8 Ultimate Lithium AA Batteries 8-Pack - Long Lasting Power for Digital Cameras, Flashlights & Emergency Kits | Leak Proof & Lightweight

I'm sure too many of us have opened a drawer seldom opened and found a flashlight or other battery operated item, and realized that likely it has been damaged due to lack of use over the passage of time. Alkaline batteries, no matter the brand, still seem to disappoint - and damage - due to chemical leakage. But even if the cells have not leaked, they are likely dead. So if this was your bedside drawer emergency flashlight, you're likely still in the dark.I was fortunate enough to be involved in evaluations of Lithium batteries when they were first developed in 1990. In fact, I salted away a few left-over 4 packs of Energizer's early L91 LithEon AA cells, and I've used one in the ancestor of what is now Gerber's Infinity Ultra AA LED flashlight, and others in toolbox lights. It's now 2011, fully 21 years later, and the remaining cells test "full", and the emergency and toolbox flashlights are damage-free and fully bright.When consumer volume and pricing for these batteries became available, I didn't hesitate to purchase and recommend these for use whenever the item will see long periods of storage (intentional or unintentional) after which like-new operation is necessary. Lithium batteries also are more tolerant of temperature of operation as well, making them a good choice for use in extremes.Energizer Lithium AA and AAA are now available in two capabilities, this one, the L91 AA (and L92 AAA), and the newer EA91 AA (and EA92 AAA). Shelf life of the L91 and L92 products are specified to 15 years retaining 90% of charge, while the E91 and E92 cells are specified to 10 years retaining 80% of charge. Both families will provide about 30 hours of operation at 100mA drain, which is typical for an LED flashlight. The L- family also provides a higher peak demand current drain capability. So, then, if your challenge is having a good, long run time in your every-day use electronics without worry if the item gets put away in a drawer for a time, choose the EA- series; if you're using AA's and AAA's in emergency lights and similar emergency gear, or demand the longest run-time after extended storage between uses, chose the L- series. Relegate your NiMH rechargeables and Alkalines for heavy use, regularly replaced items, but when long periods of storage between uses are possible or intended, use Lithium.The Energizer Lithium AA battery 8-packs are great value. I discovered these batteries as they came with my Apple wireless keyboard and mouse. I was incredibly impressed by the longevity of those particular wireless devices, when powered by these lithium batteries. I went several months without thinking about batteries in them. By comparison, afterwards, I used traditional alkaline AAs and the same devices lasted only a few short weeks.Now I am again enjoying the benefits of these lithium batteries. This 8-pack sold on Amazon is a particularly great value. At first I thought the lithium batteries were too expensive, when I saw a 2-pack in a store, for nearly ten dollars. With this package on Amazon, the batteries usually cost around two dollars each. A great value and not much more than alkaline batteries, for a lot longer lasting power!Lithium batteries also work better in extreme temperatures. If you, for example, have an outside thermostat for a weather station, this will work in the winter, whereas an alkaline battery may not.An interesting tip, when my higher power devices, like bluetooth keyboard, runs low on power. I go ahead and pop one of the used lithium batteries into a clock. I'm not sure how long it will last, but it's a great way to recycle at least a few of your almost drained lithium batteries.Now I've started using these, new, in powered toothbrushes, and I find it's a lot more powerful and longer lasting.I highly recommended these for devices that quickly drain regular alkaline varieties.These are expensive. I only use them for specific purposes where battery life and / or weight are important. In this case I'm using these Lithium Iron Di-sulfide batteries for a headlamp I'm using for backpacking. These are 33% lighter than alkaline batteries and they provide about 25% more life in my headlamp with a voltage curve that is much flatter than alkaline batteries. A flat voltage curve means voltage remains more constant from start to end of battery life. And that means my headlamp doesn't start out bright then steadily degrade to zero. With these lithium batteries, performance remains more consistent right up until they abruptly run out of juice.That translates into 10.6 hours at full power instead of 8.5 hours. Or, 116 hours at low power instead of 93 hours. That means I can carry fewer batteries and less weight. The flat voltage curve also means that Li Iron Di-sulfide batteries also handle a high drain device like a headlamp better than alkaline batteries.They also perform much better in cold weather so winter backpacking is a good use of these batteries. In sub freezing temps the battery life advantage over alkaline batteries can be as much as 4X with a drastically more consistent voltage..Best batteries in the world hands down . Here is 1 fact 1 just purchased a New Swiffer wet jet and put in regular Duracell (new ones ) and the with technology improving so does the demand for power out of batteries , with that said The jets barely sprayed ! Actually 1 slightly sprayed and the other dripped to be exact and I thought oh a crappy Swiffer .NOPE TODAY I received the lithium ex batteries and both jets shoot about 1' NOW THAT A HUGE DIFFERANCEIt is the fact the gears in the Swiffer need a certain amount of power to spin and allow the cleaner to shoot out .This in not the only difference I have noticed . I have been using these for years on electronics such as a Microsoft arc mouse blue track which is very high end but is energy efficient . Well standard batteries about 3 to 4 months the 1 step down from these x4 lithium last 1year 4 months consistently !Don't be a cheap skate and but a 100pack of no brand batteries for 2$ or even regular energizers for 4$ where you can get these for about 9$ for a 4 pack in target etc. and they will last 100x longer than the no brand name batteries and about triple 4 to 10 times the standard energizer / DuracellWell, the claim that they last 9 times longer that alkaline is a stretch. I bought them to use in my hand held hiking GPS. Energizer and Costco alkaline batteries last about 10-12 hours in my GPS. These lasted 40-45 hours. They are great because you don't have to carry as many spare batteries, but in the end you are not getting value for your money. Will not be buying them again.When you need the best and longest lasting batteries on the market which will not leak, and work in below freezing temperatures, accept no substitute.Yes these are the most expensive batteries money can buy but they are worth every penny. I wish they came up with a rechargeable version of these batteries. Did I mention they have a very long shelf life and they are lighter than Alkaline AA batteries? Buy them. You won't regret it.DO NOT BUY THESE. CUSTOMER SERVICE IS THE WORST I HAVE EVER EXPERIENCED. AT LEAST ONE BATTERY IN EACH OF THE PACKS I BOUGHT FAILED WITHIN ONE WEEK. THEY USED TO BE GREAT BATTERIES BUT NOT ANYMORE AND ENERGIZER CUSTOMER SERVICE IS BEYOND TERRIBLEIncredible battery life. I have installed in my electronic front door lock and 9 months later still going strong. To give you an idea, regular batteries in this lock usually only last 4 months then I have to replace them. If they can last more than a year, might be worth the price just to not have to keep changing batteries.The batteries died in my Nest Protect. After trying various replacement batteries, I pulled out the Nest manual to find out it requires these specific batteries. They came quickly, I popped them in and they did the trick. No more battery warnings. Hopefully they last a long time.