Energizer L91BP-8 Lithium AA Photo Battery (8-Pack) by Technuity
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Digital camera reviews of Energizer L91BP-8 Lithium AA Photo Battery (8-Pack)
Digital camera Review: Longest running AA battery
Summary: 5 Stars
When energizer brought the lithium chemistry to a 1.5v (in reality 1.7v) AA battery they gave the consumer a choice. I purchased these for a specific application, allow me to explain.
Earlier I had purchased the honeywell weather station (wireless) which relies on AA batteries - I think I used 28 doing the install. Some locations were a royal pain to get to and I did not want to try and change 4 batteries with 8 tiny screws on my roof very often.
Enter the L91BP. Batteries have a price. There is the cost of acquisition here on amazon, disposal, and the time spent replacing them. Let's say you estimate your time at $40/hr which is reasonable for any engineer.
Assuming a good grade alkaline is $1/cell and these are $2/cell to change 4 batteries I am spending an extra $4. If they last 7 times longer, I've avoided 6 trips up on the roof to change them. If it takes me 1 hour to remove and re-install the batteries, then clearly at $40/hr I have come out ahead buying the more expensive cells, since I saved 6 changes, or $240 worth of my time.
I also put a second temp meter in my deep freeze and set an alarm on it on the receiver. Because alkaline cells dont perform in sub-0 temps, I used the L91-BPs again for that application.
Now the products that are easy to change the battery in did not get the lithium cells, however they may if removing the 8 tiny screws without loss becomes a pain.
Cons:
Because of their 1.7V output, some flashlights may be overvoltaged with 4 of these in series and caution not to use lithium AA cells.
Digital camera 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.
Digital camera Review: No need for words.
Summary: 5 Stars
They are Energizer. They are superior, especially in our camera.
Shipped quickly. Great value.
Digital camera Review: Not thrilled with battery life
Summary: 3 Stars
I used these batteries in a digital camera and I was disappointed with the battery life. I haven't used this camera before, so this review might be premature.Digital camera Review: Nothing to Argue About
Summary: 4 Stars
The Energizer Lithium AA battery 8-packs are great value. I discovered these batteries as they came with my Apple wireless keyboard and mouse. I was incredibly impressed by the longevity of those particular wireless devices, when powered by these lithium batteries. I went several months without thinking about batteries in them. By comparison, afterwards, I used traditional alkaline AAs and the same devices lasted only a few short weeks.
Now I am again enjoying the benefits of these lithium batteries. This 8-pack sold on Amazon is a particularly great value. At first I thought the lithium batteries were too expensive, when I saw a 2-pack in a store, for nearly ten dollars. With this package on Amazon, the batteries usually cost around two dollars each. A great value and not much more than alkaline batteries, for a lot longer lasting power!
Lithium batteries also work better in extreme temperatures. If you, for example, have an outside thermostat for a weather station, this will work in the winter, whereas an alkaline battery may not.
An interesting tip, when my higher power devices, like bluetooth keyboard, runs low on power. I go ahead and pop one of the used lithium batteries into a clock. I'm not sure how long it will last, but it's a great way to recycle at least a few of your almost drained lithium batteries.
Now I've started using these, new, in powered toothbrushes, and I find it's a lot more powerful and longer lasting.
I highly recommended these for devices that quickly drain regular alkaline varieties.