I’m quite disappointed about how fast my LED flashlight drains its battery. This mod will reduce the current consumption and hopefully still give enough light for cycling.
Current draw before: 1.6A at 1.2V at full power.
The trick is to replace the current measurement resistor. The larger the value, the lower the current through the LED. The unmodified controller board has a 0.27 ohm resistor. Let’s replace it by 4 times larger value 1.0 ohm resistor.
Current after the mod is as expected, 4 times lower: 0.37A at full power, 0.2A in blinking mode and 0.1A in low power.
Tools needed: hot air soldering station, tweezers, replacement resistor (0805 package)