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