You'll need something that puts out at least 10amps (servos need a lot of juice)... A variable one so you can choose your voltage... 7.2V or so would work well... Still, to be honest rechargeable batteries are still the better way to go...

I agree the recharges are great, but when working on the bench i like to keep going and not stop and recharge ever so often.. I do the same with my Robotis, and other bots.. just want be able to do the same with a hexapod I'm building.. I only use rechargeable off the bench.. but if 7.2v will work I have a few of those laying round that might suit situation I just didn't want to blow the EZ-b4.

The servos are good with 7.4V and the ezb can handle up 17v or so,...so I think you're good...

Thx Richard

You're welcome.... Just don't put 17V through your ezb4 and expect your servos to like it.... :P

what if i put 10V or 11V is it ok with the servos ?

@Ahmed.Aranda 10V is too much for these hobby servos... They won't last long at that voltage...

i modified a power supply with 5k ohm pot and i got 8.15V, is this ok ?

8v or so might be ok, but is your setup able to supply enough current that your servos will need?

it supplied the needed current on 9V and i tried the servos and it worked ok