Hi Luis,

Do the regulators mentioned have diodes in series? A diode is necessary to keep the batteries independent of one another and also ensures the current draw is equal from both packs.

As the others say, creating a single point of dependency is never a good idea. I run two Rx packs with diodes in parallel joining after two HD switches, and then branch off into power for Rx and 3 match boxes. This is still not invincible, but very reliable. Also, you need seperate charge leads to each pack before the diodes (diodes allow one way current).

Hope this helps.

Regards,
Richard