Uhh $50 dollars? Wow...I bought a generic one off amazon for $8 that charges all kinds of different sized batteries and can also charge phones using a usb cable. Guess it's namebrand that's why it was so expensive.

This is the one I bought: http://www.amazon.com/EC-TECHNOLOGY%C2%AE-Multi-Purpose-Universal-Charger/dp/B007WARRKM