After 6 months one battery seems to die while others die fairly quickly. Batteries are not very high quality, but they are cheap. You get what you pay for. They were used in an Apple trackpad and charged whenever the system reported a low battery, typically with 15% remaining capacity. They have not been subjected to a very large number of charge/discharge cycles. UPDATE: Avoid those batteries, they're junk. I have 15 year old Duracell and Panasonic NiMH batteries that hold a charge and last longer than these.
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