If you have a FF and 2 batteries then this is a must. I charged in the FF for over a year before getting this and it is soooo much more convenient. Highly recommend.

This is a perfect accessory if you're looking to charge your FF battery, without having to have place the FF on the dock. Not only is this more stealthy, but it's especially helpful if you have a spare battery. When my battery dies, I simply swap it out with my alternate. The unit itself feels solid and well-made. It's money well spent if you're looking to add more than one battery to your setup.