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Looking for a battery or multiple batterys that will fit into a bic pen tube and still allow travel for wires. I require it to give me 3.3v at the same mah as rs232 standards. Its a project to build a super tiny self contained probe if youre wondering. Anways!
You're not going to find batteries that small that will meat your requirements. Batteries that small can barely put out any current, let alone the voltage and current requirements for RS232, at least not for more than about a minute.
The inside of a bic pen is pretty tiny, not much room in there for anything. What are the running current requirements for your circuit? and what kind of run time to do you need? Considering you're using RS232 for communication why can't you also connect a power cable? Or use the handshake lines to sneak a little bit of power?
I have to assume you're talking about the current popular Bic Round Stik pen family, which has an inner diameter of about 6.5 mm. The smaller hearing aid batteries (520010, 520020) are 5.75 and 5.8 mm respectively.