I also wondered about polarity issues. It seems that the LEDs light up the same way regardless as to which way I put the battery in. I only assumed that the outside leads are positive and negative… I guess I was right because the 2 batteries that I tested with this charger both charged by connected the outside leads and leaving the center one open. One thing though… since posting this, I found another battery in my collection that as more than 3 contacts… hmmmm…

Also, I had emailed Joe at usbgeek.com after receiving this product to ask him for some instructions. He didn’t reply to my email…

• Battery chargers are large because they need to regulate the flow of the electricity (besides converting from AC to DC). Not only that, some chargers are smart enough to cut off the flow when the batteries become full. I doubt this little device can do that flow regulation trick.
• I wonder how the device know which lead is positive and which is negative? More importantly, how do you know which two leads on your battery are for charging? Are they always the outer ones?
• What’s the point of being compact when you will probably need an extension USB cord in many cases?
• Julie was right on the money for the practicality side of it: you have to remove the battery to charge.

Thank you for the review. It is interesting to see what products across the pond look like.