Save $12 on the Standard Capacity batteries by buying a 3 pack. In our tests, a fresh one powered a handset II for 10 hours, and is less than 1/3 the size and weight of the original. How? It's Lithium Ion technology, much more powerful than the old school stuff. As any rechargeable battery gets older, it's capacity dwindles, and its run time gets shorter. Our batteries are so inexpensive, that you can afford to replace them more often when they start to poop out. They are expendables, after all...