Depends on the application. Any device with a motor or that provides any movement, like a miniature player/recorder/or similar, will last longer with the Energizer battery, whether a AAA or a AA. A straight resistive load, like a flashlight/or similar, are just as reliable with regular batteries. Hope this helps!
The basic unit of electric current adopted under the Systeme International d'Unites is the ampere.
Battery capacity is measured in mAh (milliamp hours), that's how much electricity can be delivered for how long (depending on consumption). The best AA NIMH (nickel-metal hydride) rechargeable batteries rate at around 2100 mAh - at 1.2volts. And regular (off the shelf) alkalines anywhere from 1500 - 3000 mAh at 1.5 to 1.7 volts
I purchased the Energizer Ultimate L91BP-4 Lithium AA Batteries, 4-Pack. Package labeling says "Holds Power up to 20 Years". Each individual battery is stamped "3/2033" near the top of positive (+) side. I wouldn't put a lot of faith in these claims but it does indicate that my supplier (National Deals) is selling fresh merchandise, and not rotating old stuff through this distribution channel. The problem is that there is no easy/fast way of tracking sellers who disappoint versus satisfying customers unless you have lots of time to waste lining up a reviewer and date to see if it can be matched up to seller feedback that may or may not have been left. Definite room for Amazon to improve tracking which would help stop sellers dumping garbage when having 100's of sellers to hide among (210 sellers in this case).