I fly one of my jet on only 5xAAA for the reciver (one reciver) and 1000mA for the pump, I have a battery watch on the reciver battery.
after start i check the batt watch - if it moves from the topmost green while banging the sticks i shut down and charge.
It's as simple as possible - and very few parts that can go wrong - it's as simple tank-start-check-fly, within 5 minues of arriving at the field.

Oh btw, did i mention the plane weighs 1500 grams, and has only 4 miniservos, and a kolibri
the thing is - consider the application before implementing the added complexity

a famous thinker once said " simplicity is the ultimate sofistication"

i see people all around fall for what i call the "bling-bling-effect"
- if it's sofisticated, lots of lights, usb interface, coloured alu, lcd-screen, chrome, lots of wires, then it must be good - right ??

Ali - if you have weighed the alternatives, considered the risks, i have NO problems with you flying with just one pack in your jets.
i trust your abilities to properly weigh the risks against ease of service/simplicity.

Everybody yapping about multi powerboxes, several batterypacks, etc, are just that ... yapping.