If you have kids (0-5 yrs) in your house you would know how many AA or AAA batteries you would need to fulfil their toy needs. I had so many toys as gifts for my kids first birthday and all of them needed atleast 2 cells. Initially I used to get a big pack from Costco, but after hearing about this product I thought I would give it a try. So went online to my favorite geek store and bought them. They were little pricey. 20$ a pack of 2 cells. I bought 2 packs.
Other than my kids toys, there are 2 other devices that I use everyday, that need a single AA battery. One is my wireless mouse and the other is the pager. The pager is on always and the mouse is on during the working hours. I charged them using a regular usb port. I just plugged them before going to bed and started using them the next morning.
I am pretty happy with the buy till now. The one that I used for the wireless mouse is yet to be recharged again. It has been 5 weeks since I first charged it fully. But the one I used for the pager which is powered on 24/7, I had to recharge it in 3 weeks, which I felt was ok.
I will be testing the other 2 that I bought on my kid’s toy and give it to him to play. Lets see how long would the charge last.

