what if to connect several laser modules in parallel to the battery?

[Vitali]

Could I use at once 8-10pcs of 670nm, 5mW laser modules (current consumption 30 mA at 3.2VDC) connected in parallel to the single LiFePO4 battery model 26650, 3.2VDC, 3400 mAh, which has max discharging current 12 Amp? Thanks a lot in advance.

 

[mhemling33]

are you using a driver? a laser connected directly to a battery is a bad idea. lasers need a cc (constant current) driver or you risk killing the diode very quickly.

 

[MikeAusC]

All the cheap tiny Laser modules I've seen use a resistor to control current current, just like a basic LED driver.

Provided the Lasers you have will work over a reasonable voltage range e.g. 3.0 to 4.2 volts, then your scheme will work.