Ditto on the LiPo4/A123 batterey packs. All of my planes are now converted. These cells do not self discharge. They deliver more amps than you can use. I make my own packs. I buy the cells here: http://www.batteryspace.com/LiFePO4-...gle-Cells.aspx No power distribution boxes or regulators are needed or desireable.

I typically use dual packs, and dual switches. I run my ignitions with opto coupled BECs. They are RCEXL brand and are cheap. You can get these from Valley View. This is a big safety advantage since you have a kill switch on the TX and an LED to visually confirm that the ignition is on or off.

Hang time Hobbies webpage will explain how to wire the charge ports. They show you how to charge through you regular charge port switch while balancing the cells. You can do this with a charging plug for your old LiPo4 capable charger.

For me it is peace of mind to know I have a bullet proof power system. I can not see myself using any other type batterey for the foreseable future.