Uh most LED's in this power range consume about 10mAH per hour. We had an array of 35 running for 6 hours on a 2s li-po pack. Adding one in never dropped my flight times at all, power usage is minimal. If your that worried about 20mah's spread over an hours usage you need to get a bigger batt pack(btw the LEDS in that volt watch are the same thing as this one.... probably a narrower band but the sameconsumption). I took that picture on manual exposure to make it appear brighter than it is. In daylight it's actually less draining that the one in your receiver pack.