I am now a strongly committed believer in this brand that outperforms by wide margins, over the 2 brands which deliver the most hype through advertising. I have always been a DuraCell customer and decided to purchase in quantity, for all of the devices I have at home. And I do a lot of traveling which requires the use of AAA batteries in mobile devices (outside of typical smartphones, etc). I stumbled upon a review for ACDelco batteries, which was done by a consumer who had battery discharge test equipment to measure the actual load and capacity of multiple brands of batteries, ignoring all of the advertising hype, which motivates people to buy one over another, This reviewer. tested all of the major brands, taking brand new batteries of each and putting them through a regimen of uses to see how quickly they drained, under various loads. He had a battery discharge measuring device (Opus), which draws specific levels of power, from light to heavy loads, and yields the results in a measurable way. I love it when someone posts a review which peels back the skin of an onion, to see what is really going on "under the hood". In case you can't find his review, I am quoting it in parentheses below, after my comments. At first, I was a bit bit surprised, being a long time "victim" of DuraCell and EverReady advertising, having never considered ACDelco, but then it made a lot of sense that this General Motors company and brand has always equipped their new cars with their own ACDelco batteries. It certainly makes sense that they might have a deeper brain trust of technology to deliver a superior "small electronics" battery. At any rate, I am extremely pleased that I stumbled upon his review, which means a lot more to me than all of the advertising hype, which does nothing to deliver any actual credible and unbiased information. The reviewer goes by the profile name of just "C" and is an Amazon Top 1000 Reviewer. His review is at the top of reviews for the ACDelco battery page on Amazon with the following link https://www.amazon.com/ACDelco-Batteries-Alkaline-Battery-Performance/dp/B00FF8KQJC/ref=pd_sim_121_4?_encoding=UTF8&refRID=WYRQGK7Z5SQ285XRJ6SS&th=1 Below is his review without the images which he attached, showing his test equipment and charts of his results for 6 Brands tested. C (TOP 1000 REVIEWER) 5.0 out of 5 stars6 Brands Tested: Capacity test results + a clear winner October 31, 2015 I couldn't find a review stating the tested capacity of the leading AAA batteries on Amazon, so I took it upon myself to find out. For each of the 6 types I've tested (ACDelco, AmazonBasics, Duracell Coppertop, Duracell Procell, Energizer, and Rayovac), I discharged 3 batteries in my Opus BT-C2000 battery analyzer at rates of 100 ma, 200 ma, and 400 ma (discharge rate affects usable capacity). These ACDelco batteries were among the top in capacity, and stomped EVERY other battery in terms of value, with AmazonBasics as a runner-up. The capacity at each discharge rate was: Disch Rt | Capacity | Runtime | Sample use case 100 mA | 1005 mAh | 10.1 hrs | Low-power LED flashlight 200 mA | 864 mAh | 4.3 hrs | Electronic toy / medium LED flashlight 400 mA | 670 mAh | 1.7 hrs | Motorized toy / bright LED flashlight I ran the ACDelco batteries first, and my original review I stated that "Though not top-notch, these results are perfectly respectable". Well, since then I've run 5 more brands, and these are pretty close to top-notch. The only other brand that managed to beat them in ANY category was AmazonBasics, but really AmazonBasics and ACDelco were at the top of the stack and the differences were probably within the margin of error. Put simply: these batteries pack a lot of punch, and they're cheap. For the cost (~$10 as of this writing), these are an excellent value -- the power supplied per dollar spent is nearly unbeatable for a non-rechargeable aaa battery, AND the capacity is very nearly the best I've tested. I have not tested shelf life or leak resistance for any of the batteries in my roundup, so it's possible that some of the other batteries may do better in that regard. The one thing I *have* learned is that a battery's marketing has nothing to do with its actual performance for power capacity ... assuming that the same is true for storage, you'll have to wait until somebody runs a thorough leak and storage test to know which brand is best. I have posted reviews for Duracell Procell, Duracell Coppertop, Energizer, and AmazonBasics aaa alkaline batteries with capacity data gathered using the exact same method and equipment. I have attached a graph and table summarizing the results in the images. To find the full reviews for the other brands for comparison purposes, go to the product pages linked below and search for 'mah' under 'all reviews' (or just browse to them on my profile)."" End Quote
