Let's Make Robots!

Questions about my hacked RC car arduino robot

Greetings everyone. I have an old RC car with 6V accumulator. Can I power my arduino board + the l293d motor driver from this accu without using any voltage regualtors? I read that arduino and 3 of the 4 pins on the l293d motor driver require 5V. 

The voltage requlator I have requires 2.5V more ie 7.5V, but the accu is 6V. More stupid questions will follow :D

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Thats funny, because accumulator is an english word from "to accumulate" and is a rechargable battery  - http://en.wikipedia.org/wiki/Accumulator_(energy)

And I want to add another question. In the datasheet of my 7805 voltage regulator it states that the recommended min. voltage should be 7V. I tested it with 6V and it gave sufficient 4.98V. What is the drawback ?

"accumulator" translated funny. No problem, happens all the time. Might just be that I don't recognize it here in the States.

Accumulator has got to be a battery pack? Maybe a voltage regulator or a ESC?