The device is much more than just a charger. All essential parameters that are relevant for the battery mode, the diagnostic and last but not least for loading are determined, and are set by the user. Those who are familiar with battery technology is the perfect system for an amazingly affordable price here. Who wants his charge batteries "just", is overwhelmed with the device and can do more harm in the worst case its batteries, as that he was "good" doing them. Man or woman should already know what C-rate, charge voltage, capacity, etc. are open circuit voltage. Then you can also display and adjustable mA, V, mAh interpret them correctly and only the selection of good and bad batteries is possible. All negative reviews (which I have read) were all written by people who were overwhelmed with the possibilities. Although I had only "caught" a copy of which had a defect, I forgive perfect score because it is the instrument for me, what I've always wanted. The exchange service from Amazon was (once again) exemplary: I had a replacement device within two days.