I've only used factory batteries (FNB-80LI is $63 at http://www.hamcity.com
). I have heard Batteries America stuff is fine. I've always just used the Yaesu NC-72B to charge our HTs and my FT-817 in the radio, but that drop-in CD-15 desk charger would be really nice. This will work with the battery alone or mounted to the radio.