My project is going to be a simply airbrake device for model rocket.
A BMP280 will read the altitude and trigger the three servos to pull open three flaps when it reached a preset altitude threshold.
I read from other posts to learn that I shouldn't power the servos through my Arduino nano and that the servos are operational at 4.8-6V. I also read that a single servo usually draws around 500 to 700 ma when it operates, and only a few ma when it's idled.
I powered it with a 4.8V NiMH 2000mah battery during experiment, and the servos seemed to function just fine. The problem is that the battery is quite heavy for the rocket and I would love to cut weight...
I am exploring options to cut weight and came across a 4.8 NiMH 220mah battery on Amazon during research, which seemed to be much lighter than my 2000mah battery.
Since I only need to supply enough power to the servos to operate for a few seconds and maybe several minutes of standby time before launching it. Three servos will operate at somewhere between 1500-2100 ma, and a 220mah battery should be able to operate the three servos for around 6 mins and idle for hours, which maybe all I need.
I wonder if my assumption is correct and can move forth to get and use the smaller battery.
Any advice or explanation would be appreciate.