[4x AA] We use these batteries every week for wireless mics and ear packs for singers. We run them for about 3 hours straight without problems.

[0.25 lb] These blow away alkalines in so many ways that it makes me wonder why they are not more popular. Low self discharge so last years when not used, do not leak acid like old alkalins tend to do, recharge over 1,000 times, keeps nasty alkalines out of the landfill, puts out more current than Duracell which is why these are popular with the flashlight crowd. Spend a few $ up front and save a fortune in the long run.

[2000 mAh] I've used these all over since they first came out and have never had one be defective or die prematurely. Very reliable.

[0.25 lb] Over the years the eneloop rechargeable batteries have proven to be the most reliable. They hold their charge really well. I can leave them in my older Nikon speedlights without worrying about leakage -- though it is still best to remove any battery from a device that is not used for years. And when I need the speedlights there is enough charge while I am charging others. The Panasonic chargers included in some SKU's are highly recommended. They provide the best current regulation for these batteries.

[0.25 lb] I love this brand of rechargeable batteries. Unfortunately, so does my husband, who keeps stealing them from me! Thanks B&H for making these affordable and available!

[0.25 lb] I've been using eneloop batteries since 2006 and it wasn't until last year that a few of the oldest ones started dying. I used keep a few spare alkaline batteries around as backups, only to have them self-corrode on the shelf long before their expiration date. I don't bother with that anymore since the eneloops maintain charge in storage well enough that they are more reliable than alkaline even for emergency backups.

[NiMH] The principal of using batteries over and over is a good one. I did notice that when fully charged, they read only 1.42 volts or so, instead of the full 1.5. When testing brand new standard batteries, you can often get 1.6. But my tester is not very sophisticated and so I would chalk this up to a relative reading. The charger and the batteries are still worthwhile.

[0.25 lb] Easy to charge, reliable

[NiMH] I've been using these forever, they are the best.

[4x AA] The batteries work fine.