Energizer L91BP-4 AA Lithium Batteries (4-Pack)
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Customer Reviews of Energizer L91BP-4 AA Lithium Batteries (4-Pack)
Customer Review: Match those batteries with the correct application for best results
Summary: 5 Stars
The Energizer L91 Lithium AA cell is a fantastic power source. For high-drain applications, it offers great advantages over ordinary alkaline cell and rechargeable NiMH cell. However, it is also very expensive as a disposable battery. So it is important to recognize the strength of L91, and use it only in applications that give you the best results. Otherwise you'll be wasting your money.
According to data sheet published by Energizer, the capacity of the Lithium AA cell (L91) is 3000mAh. This number remains nearly constant with load current. In comparison, the ordinary Alkaline battery (such as the Energizer E91 AA) is rated as 2800mAh, but only at a very light load of 25mA. At a heavy load of 1000mA (typical for a digital camera or flash unit), its capacity drops to below 1000mAh. This number gets even worse at low temperature. At zero degree C and 1000mA load, the L91 can provide about seven times more energy compared to the E91. This is where the marketing claim of "Last up to 7 times longer" comes from.
When used in a digital camera at room temperature of 25 degree C, the L91 is more likely to last 3-4 times longer than alkaline. This is enough to justify its price, which is also around 3-4 times higher than alkaline. However, in low-drain applications (such as smoke detector, wireless mouse or remote control) alkaline cells will last just as long at a fraction of the cost.
The L91 also contains much higher energy when compared to an ordinary rechargeable NiMH cell such as the Energizer NH15-2500. This is partially due to its higher terminal voltage of 1.5V, which is 20% higher than that for NiMH.
Energy stored in NH15-2500 : 2.5Ah * 1.25V = 3.125Wh,
Energy stored in L91 : 3Ah * 1.5V = 4.5Wh (44% higher).
Higher terminal voltage for L91 is especially advantageous in digital camera applications, because your camera flash will recharge up to 20% faster. An added benefit is that the L91 weighs only 14.5 grams (0.5 oz) each, compared to 30 grams (1 oz) for NiMH. So your camera becomes much lighter.
The NH15-2500, like all ordinary NiMH cells, suffers from rapid self-discharge problem. If you charge up a set of those cells and leave them in your camera for a few weeks, you're likely to be greeted by 'Low Battery' sign when you try to take a photo. The new generation of 'ready-to-use' NiMH cells such as SANYO eneloop and Rayovac Hybrid solved this problem by having very low self discharge rate. But they have lower capacity of only 2000-2100mAh.
Bottom line: If you need AA batteries for a long hiking trip, then L91 is obviously your best choice. For most other situations, I recommend using low self-discharge NiMH cells for lower operating cost.
Customer Review: They keep going, and going, and going ....
Summary: 5 Stars
Ok, sorry, I couldn't help myself with the title. These batteries are something else. As many other reviewers have said, these batteries last a long time, but who knows just how long? I got these batteries for my Canon A560 camera for a trip to Europe in September. I took approximately 700 pictures on the trip. It's now the end of December, I've taken approximately 150-200 more pictures, and the batteries are still going strong.
So in short I'm closing in on four months and almost a thousand pictures on two batteries that weigh about half as much as regular alkalines. Just incredible.
Customer Review: Side Benefit: Makes Your Device Really Lightweight
Summary: 5 Stars
I'm usually not one to rave about AA batteries. But these are the best. You've probably seen these advertised and on the store rack and have wondered, "Why the heck should I pay anywhere near $10 for four disposable AA's?" These ARE everything the reviewers say, AND they are incredibly lightweight for cameras, mini-flashlights, etc.
I use these in two Canon PowerShot A-series point-and-shoot cameras. The older one uses four AA's and the newer two. It makes a big difference in weight for both cameras. So much so that a friend held one of these cameras and immediately said, "Man, these Canons are so lightweight. . .." They aren't (using normal batteries), but I just let it slide. Her camera is a featherweight "purse-sized" Sony. These batteries are so light I'm thinking they might even imbalance a larger camera with AA's all in the grip (I actually like SLR's with a little heft for stability.).
Like everyone else, I use point-and-shoot cameras sporadically, sometimes going weeks or months without using them. The rechargeables would, of course, drain out and never be ready when I grab them for some moment I wanted to capture. And going back to the old Ni-Cad days, I'm hesitant about plugging in rechargeables for weeks at a time straight. I know charging technology (not to mention the batteries themselves) has improved and moved on, but still. These have to be the perfect batteries for the way I use the cameras.
I like these so much I'm thinking of using them for the remote controls around the house. Overkill, yes, but that's how much I love them. Gotta look for coupons or something. . .
Customer Review: better than rechargeables
Summary: 5 Stars
These work great in my new Nikon L12. I have the rechargeabels, but they would be drained down so quickly in this camera, that it became a pain in the neck all the time. These new lithium are little pricey, but they make taking digital photos a lot easier.Customer Review: Kept my Canon 570IS going strong on a two-month hiking trip
Summary: 5 Stars
I needed a light digital camera for an extended trek in Europe (the Camino de Santiago pilgrimage in Spain), so after much research I purchased a Canon 570IS. One selling point for the Canon was its power source: two AA batteries - lightweight and easy to replace in any country. I was going to go with a cheaper package of AAs, but my photographer friend suggested I buy the Energizer Lithiums. He told me that they lasted longer in digital cameras than regular AAs, and therefore I wouldn't have to carry as many. I took his advice, and he was right on all counts.
During my two months in Spain and France, I took almost 900 pictures. Along the Camino, photo opportunities arose multiple times throughout each day. Over and over again, I'd take my camera out of the case, turn it on, take one or more shots, and then turn it off. During rest stops I'd view the camera's growing stash of pictures on its rear screen for my own pleasure, or to show them off to others. Through it all, the two Energizer Lithium batteries kept my Canon humming along like a charm. I brought along an 8-pack to ensure I had enough, but ended up using only 4 of them (I gave two away to another pilgrim after his camera's batteries suddenly died, and never used the last two).
Bottom line, the Energizer Lithium batteries went way beyond my expectations. I figured I would have to change them every two weeks, but that wasn't the case. Indeed, the first pair was still working fine after 30 days (remembering the above experience with my fellow trekker, I changed them at the 4-week mark just to be proactive). As a newbie digital camera user, I was surprised and pleased with the Energizer Lithiums. I'm glad my friend recommended them to me, and I second his advice to purchase them for whatever point-and-shoot camera you use to document your next journey.