When I refer to "digital servos" I refer to those high precision high power servos that are on many, if not most 3D large scale aircraft. The standard servo, although it may be digital, is not the big current draw that those expensive ones. Note that when a batter is shipped with a tansmitter/receiver are 4.8 volt 600 or 700 mah packs, and those work fine for a few flights and they are just fine with the servos shipped with them. And, when set up properly - no binds and no end-stop issues, their current draw now becomes a matter of how active the pilot is on the sticks. And, another good reason to check before the flying begins on a flying day to make sure that the battery is up where it belongs. Then, upon landing, since it is not practical to dismantle everything to check batteries, the voltwatch 2, for example, obviously there others, do just fine because they do check under the existing load.

CGr.