These little servos are great and for the price who cares if you break one or two. They are rated 4.8v~6v. So I think they are great for 4 or Hobby Kings new 1.6 rechargeable. Why would you need 4 x 9 KG servos? So the size of battery really depends on what you are doing. What PLANE, Crawler or Car they go in.
Allison yes that is true it has metal gears. It seem not possible that you could buy a metal gear servo for only $6.06. This is why it is on back order. The listing does say Features: Metal Gears Dual Ball-race. I hope this helps.
Try the HK15298 High Voltage Coreless Digital Servo. It will operate on normal voltage (5V) & up to 7.4V if you wish. Much faster than the HK15288A and worth the extra price. You could use it all round as well if on a budget, but best to find a high-end servo for the tail (sub .10sec), but no high end servos stocked in AUS warehouse though.
These are great servos, but there is a small risk they can short inside.To ensure they dont just drop the bottom off of the case and add a small foam insert between the control pot and the circuit board . Easy fix :)
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brought 2 of these servos. I am very impressed with them for the price. They center well and have plenty of power. I would buy more.