I've asked this in other threads before but have never gotten an answer, so I figured that I would try again. I run 7 cell packs on the SV all day long without a receiver battery pack, yet there are those on the baords that swear that they are a "must-have". Can anyone tell me why? Does the reeceiver not like 16.8 volts as opposed to 14.4? I have been really curious about this for a while now, in regards to the SV and the BJ as well. I have a buddy running 9.6v packs (19.2v total) in the BJ without a receiver battery pack, and I wondered if the same thinking applied to the BJ receiver as well.