ORIGINAL: JoeAirPort
Yeah I agree, I'd hate to have a connection in the battery pack shake loose. Or worse, the whole battery vibrate off the mount and fall out. The firewall mounts seems like it would be more solid and fool proof. I was trying to get it as far forward as possible to not have to add any more lead but that would be pushing the reliability factor (and increasing the crash factor).
It's not the connection or the physical loss of the battery that's a concern. Batteries are susceptible to internal damage due to excessive vibration.