It's important to note that Energizer has discontinued the "e^2 (e squared)" line of Lithium batteries, and the item shipping now is named "Energizer Ultimate Lithium." As other customers have mentioned, it is important to note that the TSA has banned *spare* primary lithium and lithium-ion batteries from *checked* baggage - you can still take them as carry-on items though. Other than that, like many people my experience with Lithium batteries has been mixed. I wish Energizer would release a line of rechargeable Lithium batteries to supplement these disposable ones. That being said however, for "high-tech" items that I use frequently (like my bluetooth mouse) and LED flashlight, I find that using Lithium batteries saves me from having to swap in new batteries all the time and that, in general, the devices seem to work better, brighter, etc. One last, notable, advantage I've found using Lithium batteries is that they also send to work better in the cold. Especially up here in New England when it's below zero outside and you're trying to find something in the dark :-)
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