Good afternoon and thx for your time
i need to power some servos (18) from a battery but i cant find a good 6v battery (in Denmark)
so what is the best way to get 6v?
i know i can use serie Resistors but if the battery drops it wont work
what is the best way to do this and what pro/cons will it have for the Amp/h
edit[1]
the servos will use a bit of amp. so 9,6-6v idea needs to stand that
Sounds like you need a Power supply that uses a Switching Regulator, also known as a DC/DC converter.
Here's an example:
You buy from Farnell/Denmark?
thx for the help 
i normaly buy from http://www.let-elektronik.dk/ but i had no luck finding an 6v output. if i use 5v my servos will not be strong enough
but now i know what to look for
thx for the help that have all i need but how can it give 6v from 4.5V to 14V input?? is it just i will get 6v if i give it more then 6v input?
thx again
"how can it give 6v from 4.5V to 14V input?? "
See Note 16 on page 4:
"Vin must be 2V or higher than Vout for 3.3 to 6V outputs: Vin >= (2V + Vout)"
And the Rtrim requirements in the table on the same page for a 6V output.
So you need 8V input, you are using 9.6V so you are good.
For 6V output, Rtrim is calculated to be 218.5V. If you use a 220 ohm, 1% resistor the Vout might be a little under 6V.
Rtrim (Kohm) = 1.182/(Vout - 0.591)
rearrange the equation some:
Vout - 0.591 = 1.182/Rtrim
Vout = 1.182/Rtrim + 0.591 >> 1.182/0.220 + 0.591 = 5.96V for 0.220K (220 ohm) resistor.
thx just to be sure and NOT blow it up when i get it can you tell me what to put on what pin
fx.
pin1 = +out
pin2 = GND
pin3 = resistor xxx
pin4 = +input
just to be sure 
Edit( 1 )
do you think i can run 18 motors on 1000mA/h or do i need like 5000? or even more :s
Connect it up per page 5 of the data sheet
Pin 1 open
Pin 2 Vin
Pin 3 Gnd
Pin 4 Vout
Pin 5 Rtrim to ground.
Pay attention to the notes on Sheet 4 and 9 regarding input & output capacitors.
You haven't provided any info on your servos.
Not yet possible to answer the question "do you think i can run 18 motors on 1000mA/h or do i need like 5000?"
sry for the servos
http://www.servocity.com/html/s3003_servo_standard.html
What is the pin 1 open for, is it like a swith i can use to power on/off?
Pin 1 - Yes. High = on, Low = Off.
"The On/Off Control is normally controlled by a switch or open collector or open drain transistor.
But it may also be driven with external logic or by applying appropriate external
voltages which are referenced to Input Common."
Servo's;
Current Drain (4.8V): 7.2mA/idle
Current Drain (6.0V): 8mA/idle
No info is provided on current needed for different movement situations.
See if you can find a source that tells more.
i am sry but all the datasheets i found says the same info and no more 
http://www.cntl.kyutech.ac.jp/robocar/2010/references/kurolab/datasheet/ET-SERVO-S3003.PDF
and i dont know how to measure it.
the only thing i know is that i can drive it at 5v from my computer supply and that said (5v 30A) so thats is no help
Do you have a multimeter?
Put it in mA mode, connect it in series from your PC supply to the servo.
Let the arduino command it to move with your intended load, see what you get.
thx for the help again i got one but i burn it yesterday and i do not have a new fuse for it, but i will try when i get a new one.
thx for all your help today