I had these batteries for an R/C car here, so thought I might use them. They are 7.2 V, 3800mAh, Ni-MH. (see Pic)

Quick question. What size is the barrel jack on the EZ-B pwr in? I attempted to add a pic of the batteries I want to use. The add image asks for a URL. Do I have to post my pic on an online album somewhere to get an URL? Tried using my file name on my computer. Don"t work. Thanks, Lloyd

Those 7.2s will work fine. I have nearly the same size packs and they work good.

I can't remember what that plug is called. What i did is if you look at the top of the board between the jack and the voltage regulator you will see a tiny Gnd and below that a Vin + I just soldered some jumper wires there with the same style plug as all my battery's have.

If you change the battery pack plug to that barrel plug... you will most likely need to change the plug on whatever charger your using also.

You will need to upload the picture to a site then link it here.

Anyways If your RC car's battery plug is common a hobby store may have one for your ezb... If its really common i may have some here ill give you for free (i cut the plugs off of everything) all my battery's have whats called deans plugs.

Good, glad to hear that I can use those battery packs. I'd like to make an adapter cable so I can plug in the barrel. If you have any of the barrel plugs like the ones on DJ's batt pack; that would great. Thanks for the offer. Let me know and I'll send you my address. Lloyd

What if I ran 2 of the original style omnibot batteries (6V) and used one for the board and other for periferals (like my high torque servos)? Could that work? Or do I really need 7.2V for the board to be optimal?

Can anybody tell me the size of the barrel plug used on the battery pack? Is it neg. outside/pos. inside, or other way around? Thanks.

sorry Loyd i have none of the barrel plugs but DJ is selling some on the buy page Alternate Power Adapter $3.84

Bret I would think just one of the omnibot batterys would work just fine all by itself.

Well ,thanks anyway Ron. Guess I'll order a couple from DJ. OK. I checked the manual before I asked this question. I want to supply a seperate battery pack for the servos. There is a reference in the manual to V.2 of the EZ-B but not for V.3. I checked carefully. If I missed it I gotta get better glasses! So, can anyone get me up to speed on wiring the servo power supply? Next: On the SparkFun motor controller. I got the positive hookup ( I think) which is "VM". This positive should come from a seperate battery( per one of DJ's posts.) That being true basic electronics says that to complete the circuit it must return to ground on that seperate batt.pack. Right??? so, should I connect the battery neg. to the last (or bottom) ground on the output side of the motor controller? Since I will be using a seperate batt.pack for the servos, can"t I use that same batt for "VM"? Should I install a seperate bus terminal ( inside my bot) for the seperate batt. pack? Hope I didn't make that confusing.