Works flawlessly in all the new toys the boys got for Christmas. Used an existing duracell battery charger and keep them grouped together so we don't have any weird battery issues (ones dying before the others).
I uses these high mAh batteries to power my Nikon camera flash units, and find they are powerful and long lasting, and recharge quickly. While I've only been onto is particular model of battery for a couple years, they seem poised to last for a good long useful life.
Great price for 16 rechargeable batteries! With 3 kids and constantly replacing batteries these are so much more economical. I would have rated it 5 stars but the *free storage box only holds 3 batteries which makes no sense when you order 16.