I found these two batteries in a drawer while looking for batteries for my wireless mouse. I was surprised to see that they are 4500 mAh, which is much higher than any AA battery I could find on the Internet.
I don't have a way to measure the capacity, but I have a 180mA charger that I used to charge them for 25 hours (25*180 = 4500, half of 9000). Sure enough, when I put them in my wireless mouse, my computer showed that they're about 50% charged.
How is this possible? Do they mean 4500 for both batteries? Is my measuring strategy flawed? What can I use to measure their capacity accurately?