I like the Sirius also. It's all I use. Go to the battery/charger forum of RCU and do a search for Sirius chargers. Even SR Batteries likes them. Heliproz has the best price I've seen. I also have a Sirius battery tester that measures how much capacity a battery has. I use it once or twice a year to check battery performance and it works great. Be aware though that on many transmitters you will have to bypass the diode in the radio charging ciruit to use the Sirius. It's not difficult and the Peak/Sirius web site has easy to follow directions and photos. That's all folks.