I want to supply power to my Arduino R4 minima and at the same time to 6 MG995 servo motors.
I was thinking of powering my Arduino R4 minima with a 9V battery into the board's power jack (with a converter) and at the same time having an external power supply for my 6 MG995 servo motors with ??? 1.5 V AA batteries. I say ?? because I was thinking of 4 AA 1.5V batteries to get 6V (MG995 operate in the range of 4.8 to 6.6V) but they need 2A so 12A for 6 servos, while 4 batteries would provide only 8A. I am scared that it is not enough but at the same time, 6 batteries (or even 5) would provide too much voltage.
A fresh, alkaline AA battery will provide at most about 2A. For that many servos, most people use 4.8 - 6V NiCD or NiMH battery packs designed for RC vehicles, available from RC hobby shops.
I haved looked into it but 4.8 - 6V NiCD battery packs provide 1800mAh so 1.8A by battery, if I use four of them its the same thing? Enough voltage but not enough A
Usually NiMH battery packs haven even less mAh.
That is the battery capacity, which is rather small. The "C" rating tells you the maximum current draw, so a 10C, 1.8Ah battery supports 18A maximum current.
You batteries in series don't increase your amps. 4,5 or 6, it's still 2A. You have to put them parallel to get more amps. If you need 12A at 6V, so about 70W, you better go with something else than aa batteries.