Hey guys i need help selecting a battery that would work most efficiently. The battery is powering a 200mW laser. Currently i'm using a 12v battery with a lm1117 voltage regulator. the laser runs on 3v so the voltage regulator gets very hot because there is a huge voltage difference.
So would it work better if i buy a 6v battery? my only concern is then the dropout voltage of the voltage regulator. the data sheet says its 1.15 v so (6v - 1.15v = 4.85v). so i have very little room for the battery to get flat. for example when the battery voltage goes down to 4.15v then the voltage to the laser will start dropping below 3v
My other option is to keep the 12v battery and get a buck voltage regulator like this one https://www.robotics.org.za/index.php?route=product/product&path=59_146&product_id=256 Although im not sure which is my best option. My goal is for the battery to last as long as possible