Asked
— Edited

Can the ezb4 use a 11.1v 1300 mAh bettery directly?
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Yes you can use 11.1v to power the EZ-B. Anything up to 16v with 20v spike can be used as I understand it. As d.cochran said, you would need to use regulators to power peripherals such as servos ect that are under 11.1v connected to the EZ-B ports, or they will burn out. What ever voltage you power the EZ-B with will come straight through to the digital Vcc Center red pins on each digital port. The battery can be any mAh as it's just a discharge time measurement.
The camera is already voltage regulated so no worries about the camera...
All you have to do is use 7.4V lipo instead of an 11.1 and all your problems are solved.... So except for a ping, you won't need any voltage regulators if you use a 7.4V battery