Like the title says, this thing is a battery charger on steroids. This thing will charge (duh), discharge, recondition, test, slice, dice...wait forget those last two. Back on topic, this is so much more than just a battery charger. I've only been able to "play" with it a little bit but I think it's really cool. First off I've never seen a battery charger with a real display like this thing has. It sure blows the typical green light for charged and red light for charging that most other chargers have out of the water. It shows you so much information about the batteries it makes my inner geek jump with joy.To test it out I took some old AAA rechargables I had laying around and put this thing through the wringer. Since the batteries had been laying around for a good while, I just let it charge them. About 5 or so minutes later, two of the batteries said FULL while the others kept charging which took about another 20 minutes on the default amperage. Since it appears that I had two bad batteries, I decided to see what else this wonderful gizmo could do. I decided to run a quick test on it. The quick test just checks the internal resistance of the battery. In other words, low resistance good, high resistance bad. After the quick test, I had readings on the awesome display, of about 120 milliohms for the good batteries and around 150 for the bad ones. The manual states that a good battery should be around 20 - 80 milliohms but anything over 500 is a sign that the battery is kaput.Since I was in a testing mood, and because it seems like I had two good batteries and two possibly quasi crappy batteries, I decided to do the full test. This test charges the battery and then discharges is. After the discharge is complete, the display shows you how much juice it sucked out of the batteries. You can then compare this to what the battery is actually rated for. Two of my batteries had a really low mAh rating while the other two were a bit higher. This leads me to believe that two of these batteries are still almost dead.While I haven't done a refresh yet, it's next on the list. I haven't done it yet simply because it can take a long time since it involves multiple charge/discharge cycles. I'm sure though that since these batteries are old, the refresh mode should be able to knock some sense into them and give them a little extra life. I'll try and update the review after I've done that but don't hold your breath. Sorry, just being honest cause it may or may not actually get done.The display is very easy to read and has a back light that comes on at first and then returns later one whenever you push a button. Speaking of buttons, the buttons are nice and big. Not monster huge but they are big enough for a normal human to be able to push them. You can view different...uhm...stats on different batteries too. By pushing the SLOT button, you can cycle through the different well, slots. This makes them blink after which you can push DISPLAY and cycle through the battery voltage, mAh, time since charge/etc started, and the charge/discharge current. While this isn't something that most normal people would do, it can still be done!Basically to make a long story short...or I guess that would be a long review short, this battery charger is the cat's meow. The only gripes I could make myself come up with, are that it doesn't nativly fit C or D batteries. There is however an adapter to make them fit but I honestly don't care because I don't have any rechargeable C or D batteries. Also since this thing is the Albert Einstein, or should it be the Nikola Tesla? Either way, since this thing is the Albert Tesla of battery chargers, it would be nice it played some fancy whimsical melody when it was done doing your battery maintenance deeds.Product was received for no charge in exchange for a review.