I bought this charger read the recommendations on Amazon, and it is without regret. Some positive comments were published here, and it is true that the "recovery" of batteries that were thought good for recycling is very effective. This is however not miraculous: the best batteries that have been abused by a bad charger (overheating) can often operate satisfactorily once refreshed by the BC-700, but some damage is still reversible. This charger and some games good battery low self-discharge (like Sanyo Eneloop - Best), and you will not need to buy AA or AAA batteries. For those who read the English / American, I highly recommend going to read the thoughtful comments of "NLee the engineer" at Amazon.com. You will find a lot of useful information and very well done and FAQ constantly updated. A must! Here is the link to this wealth of information: