About 4 years ago, I got a set of Apple rechargeable AA-sized batteries. At the time, for 6 batteries and a charger, it was actually a good price at USD $30. Well, 4 years on, I’d been swapping batteries into my wireless keyboard and trackpad quite frequently – usually once a week. The batteries just weren’t holding their charge any longer. So, I needed a replacement.
I really didn’t want to toss my batteries and the charger (I do like the sleek design of it) so after doing some research, I found that Apple’s batteries were simply re-wrapped Sanyo Eneloop rechargeable batteries. Sanyo’s since been acquired by Panasonic, so I ordered a set of 8 from Amazon for a whopping USD $19. They came about 70% charged and have been working just fine.