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If you have a device in a fridge or freezer or outside where it gets cold/freezing, then these are very useful since alkaline batteries will often fail in cold temperatures. These lithium batteries are great. They are also useful for devices that are inconvenient to change batteries, like clocks or wireless outdoor temperature or motion sensors. They are long lasting, lightweight and work great in freezing temperatures. Their "BEST BY" date is often ten years or more. If you're wealthy, then you might as well use these instead of alkaline or rechargeables, but because of the relatively high cost, I only use these for "special" applications. Otherwise I use alkalines or Sanyo Eneloop rechargeable batteries.
I use 'em in my battery-eating HeadRoom Super Bithead portable headphone amp (4-AAA) along with my iPod Classic and Shure SE-530PTT music rig, and they outlast multiple sets of Duracell copper-top and Energizer Max alkalines. Very pricey (Amazon beats Wal-Mart hands-down), but they last the longest of any battery source. Consumer's just reviewed batteries for power-hungry digital cameras and confirmed same. I carry an extra set in my computer bag so i'm never without my tunes. LOL.
Oops. I didn't realize there are TWO different types of lithium batteries: plain and rechargeable. I bought these, which are the plain type, but I meant to buy rechargeable. Though they're not what I wanted, for non-rechargeables they're pretty good.
These new Lithium batteries does provide much longer power strength and intensity than regular alkaline batteries. However, effective January 1, 2008, the Department of Transportation prohibits loose lithium batteries in checked baggage. This type of primary AA / AAA sized Lithium battery is within the ban.Basically, if by any reason this type of battery caught on fire (AKA lithium fire), few regular fire extinguisher would work to put off the fire. So make sure those batteries are packed into the electronics and put them into the carry-on luggages with you.SEE http://www.tsa.gov/travelers/airtravel/assistant/batteries.shtm
I've gone through a couple packs of these in my GPS unit. They don't hold nearly as long as it seems they should considering the higher price compared to alkaline. Rechargeable NIMH batteries are much more enviro-friendly, cost-effective and hold up in the long run far better than these lithiums and alkalines that you just have to throw away.
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