[Elecraft] KX3/P3 external power source

[Matthew MacRoberts]

I need to work up a reliable external power source for my KX3 and P3. I also have RC aircraft and cars… So a LiPo or LiFe battery is an easy solution for me. 

The battery would offer substantial weight savings and I already have the chargers and other equipment necessary to build the connections.

Is there anything that I need to be aware of? Would a 4S 14.8V 5200mAh 50C be workable?

What other advice would you have?