If it's a flex drive, would using two 18350 batteries damage it or just cause it to produce more heat?
It would damage it if it is much more than 5.5 volts total input...
See documentation here:
http://hacylon.case.edu/ebay/laser_diode/MicroFlexDrive_V5_manual.pdf
Helllo i want to order something from you. how do i do it.