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Lithium ion batteries are one of the most common rechargeable batteries in portable electronics. They are known for having one of the best energy densities, no memory effect, and a slow loss of charge when not in use, in comparison with other chemistries of rechargeable batteries. These AAA-sized batteries can be used in a variety of applications where standard AAA cells are called for, but always double check the specs before using a Li-Ion cell in a device you are not sure on. If you have any questions, or can't find what you're looking for, speak with one of our battery specialists using our live chat feature at the top of your screen, or call 860-767-8888 any week day between 9:00 AM and 5:00 PM Eastern Time!