Is it safe to connect RC helicopter battary to arduino

Projects General Guidance
1

Hey, I have seen that it safe to connect 7V-12V to the arduino over here: http://arduino.cc/en/Main/ArduinoBoardUno
Although my RC battary is 8.4V, I am sure it is capable to provide higher current rather then 9V battery.
So, my question: Would it be safe to connect it to arduino uno ( to Vin pin )?

Battery information: Ni-MH 8.4V 28AAA 400mAh P

2

Perfectly safe.

3

In general every piece of electronics that takes a DC power supply expects a voltage source and draws as much current as it wants (assuming the source can provide it). The voltage has to be right and the current capability has to be large enough, but there's no problem if it can provide more current than is needed.

4

KE7GKP:
Yes, as long as you get the + and - connect the right way around, 8.4v is a safe voltage to power Arduino.

However, at 400mAh, it is comparable to a rather low-end 9V battery.
Nine-volt battery - Wikipedia

True, but I'm sure it's instantaneous current draw capacity is higher then those wimpy 9vdc batteries.

Lefty

5

MarkT:
In general every piece of electronics that takes a DC power supply expects a voltage source and draws as much current as it wants (assuming the source can provide it). The voltage has to be right and the current capability has to be large enough, but there's no problem if it can provide more current than is needed.

I was pretty sure about this thing, but I still want absolutely sure.