Right!

That's a 500mA draw on a single small 5g servo.

A regular size servo can draw 2A ( 2000mA ) at stall, yet many fly with 400mAh packs.

Now we usually never fly with our servos stalled, but the current drain is indicative of how much the servos COULD pull in the air under aerobatic loads.

After I saw what servos can draw under load, I took to upgrading ALL of my battery packs to well over 1600mAh even on my smaller planes.