Bests & Worsts Reviews from Amazon

The ratio of amount of energy you get per dollar with these batteries if far superior then any others available. They don't last the longest, but if you can live with replacing them slightly more often, you'll get much more bang for your buck. I bought these for general use for items that cannot use nimh rechargeables (because of their lower voltage). These have an average voltage of 1.58-1.6v. The expiration date on the batteries I got were almost 5 years from date of purchase. After 6months of storage, the few that remain show a voltage drop of less then 0.02v. I tested these in a small black diamond headlamp to compare to other batteries. These lasted roughly 80hrs. Duracell ultra lasted about 90hrs. Amazon's lasted about 75hrs. Harborfreight lasted about 75hrs. Energizer Rechargeables lasted about 40hrs (any rechargeable wouldve had the same result). So as you can see they dont really last as long as others ( I know the duracell's I tested for sure, I'm confident there are others ), but if they aren't critical to last the longest ( IE in a headlamp where you dont want to carry spare batteries around ) then they are a great economical battery. If you are using these for camera flash or something else that drains a lot of power quick - you might want to look into lithiums - they'll server your purpose better. I used subscribe and save to save money on them, definitely made it worth it (even if you only get one shippment).