i'm using a rhino 360 2S with a 5V regulador wich make also "model lost alarm" and "low voltage alarm". it works very well.
this LIPO + this BEC is lighter than than the original NIMH battery.
for the weight, it's not really interesting in a ALULA has we need to add (too much!!) weight to have correct CG.
but for the added functions, it's interesting...
for the duration of flights..... i think you can fly about 2 hours with this configuration, but i did not make specific tests.
it depense also of your receiver. a FM receiver consume generally farless current than a 2,4ghz receiver.
i use the servos from dream-flight (excelent servo, except when you break a gear!
) and a spektrum AR6100 receiver