the 1400ma Intellect cells in 4.8 v is in my book -easily the best setup going
they charge fast - are very light -have extremely deep draw characteristics -(ignitions love this part).
To be blunt -I would not trade one of these for a roomful of liIons and a reg .
HINT-why do you think 3W said do NOTuse reg.?
The designer of Vlach ignitions once was adamant about using only NiCad -simply to get full current required to "loadup" each charge of the circuit.
I checked with an old friend who has designed a number of successful ignitions and asked "what's the poop on this?"
The short answer is that tho the battery size -in amperehours need not be high --
the ability to instantly draw power is very desireable.
You won't see the spike on your voltmeter but a scope will show it
It is funny - the best battery setup is the most simple but some guys always think their high tech stuf is an improvement -
Go figure.
Back to original question-- THAT particular reg is a good one --for helis -but was done to allow seperate use of power in case the BIG one dropped out.
On my electric aerobatic models --I use a small switching reg on the 75amp ESC to supply 5v to the four small servos.
It has become a problem with many BEC's in ESC designs -- to easily overheat under load and drop voltage below the rx operating threshold.
This is a problem that took some careful sluething to pinpoint and even then -some guys still play Russian Roulette with their setups.