ORIGINAL: ameyam
ORIGINAL: BarracudaHockey
I use a single A123 pack with two leads (wrongwayrc.com) to power both the receiver and ignition on 3 50cc planes. Simple, clean, no issues.
No issues with range, not sure why anyone would feel that would limit radio range in any case.
Well, now even the moderator does it!

Seriously, I have been asking this for quite some time. I too have a A123 (LiFe 3200mAh) with 2 leads and I would also like to do this to save weight. But most told me not to do this
Ameyam
Moderator, product reviewer, author, modeler for 25 ish years.
Only to give context because I hate posting "resume" type posts, but to give you the perspective that I'm not talking about my first big plane with no clue whats going on. I did avionics on Navy aircraft for a long time too so when it comes to radio equipment installation, I've got a pretty solid background.
1 2300 pack = 4 flights and charge. JR 921rx, 6x 7955 digital servos, and a DLE 55 ignition with a 42percent scale optical kill switch. Pilot RC Sbach, Pilot RC Yak, and Extreme Flight Extra.
I do step down the voltage going to the ignition with the reducer diode sold by WrongWay
Heck, even at conservative charge rates, they can be fully charged between flights if you want to.