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Shocking Performance (2009-05-30)
The 3 Volt CR-123A batteries I purchased were the correct dimensions, were properly polarized (one end was positive and the other negative), also known as the cathode and anode, had attractive art work on the outside, were not excessively heavy and came filled up with freely mobile electrons. The cylindrical structure was more than capable of containing the electron flux until instructed by the camera device to release a flow. These were not rechargeable and I want to say that when the electron flux had dissipated below a useful level, due to the dimensions and exterior geometry of the flux container I was able to propel them quite rapidly with a slingshot. To those of you who are crazy into recycling I point out that there were no prohibitions on either the flux canister or the packaging that prohibited slingshot disposal methods. I used a really, really think rubber band and unless the atmospheric friction incinerated the flux canister, it now resides in low earth orbit. As for the packaging material, it is now in adump.

Good cheap batteries (2009-04-07)
They work! What more can be said? This is a great price for a reputable brand name, especially for CR123 size batteries, which can be hard to find and expensive. I've been using these for a remote control blimp and just one of them has lasted for hours of use so far.

just plain lousy batteries... (2009-03-12)
I bought several packages of these to use in a smoke detector. I was tired of running out to the store for a new Duracell every few months, and at half the price, I figured, if they don't last quite as long, what's the harm?

As opposed to the Duracell, which lasted six months in my smoke detector, I have had to change these batteries once every 3-4 WEEKS. Judging from the number of positive reviews, perhaps other devices are better matched to these batteries, or possibly there's just really poor quality control. Either way, I wouldn't recommend these to anyone for any critical application.

THE SAME FOR LESS (2009-02-19)
This type of battery is hard to find and can be expensive. It's worth buying a couple of packs. The shelf life is over 8 years. They don't leak like alkaline, so you don't have to take out of their equipment,

I use these for several flashlights that I own. They work EXACTLY the same as a Duracell or Energizer for 1/3 the price. Don't think you're getting more or less by buying a certain brand.

Although, I can say from my experience that the Radio Shack brand of batteries are of less quality and reliability. Example: My father bought a couple of packs of this type from R.S. for over $12 and they barely worked at all.

Same price, worse performance (2009-02-03)
I bought the Ultralast 2-pack as a filler item. Out of the box, one cell measured 100% on my ZTS tester and the other one measured 80%. Not acceptable, AND hazardous to use in 2-cell lights (the weaker battery can burst and start a fire).

It is not hard to find Energizer, Duracell, Panasonic, or Rayovac CR123A batteries online for about $2.00 each. Or even off-brand Titanium or Battery Station for $1.00 each. But every cell from these manufacturers shows 100%, in my experience.