LED Headlight question?

[Dave Rocks]

My Ebike has a headlight that runs off the 48v battery.
Pushing the + button on the display turns on the display backlight and the headlight.
This headlight has 2 wires + and - (red and black).

I bought this AAA battery LED head light and I was wondering if I could splice the Ebike wires to the
battery headlight to the red and black battery connections?

Thanks.

 

[RunForTheHills]

You would need to step the voltage down first. How many AAA batteries does it have and are they in series or in parallel? The nominal voltage of a AAA battery is 1.5V and two in series is 3V. Look for a DC to DC buck converter to step down from 48V to the voltage of the new headlight.

 

[Dave Rocks]

Thanks man you answered my question. I just wanted to know if I could just splice the Ebike light wires to the battery headlight. I can’t.

 

[mjeds]

in my experience, most e-bike use 6v lights. even though they run off the 48v battery, the controller has a DC stepdown for the lights or other accessories. (like USB, plug for phone charger)


however unless it is a specific e-bike light with the same type plug/adapter that your bike has, I would be hesitant to use or wire anything in for fear of blowing the controller, as you don't really know unless the manufacturer tells you.

for example, on one of my bikes the manufacturer insisted that the headlight was 48v, I bought a e-bike 48v light plug and play right? nope, didn't work and fried the controller.

I have since opted to wire in my own lighting system off its own battery. front, rear, side lights, all LED all off a 12v 8ah portable battery stashed in my rear pack. works for 10+ hours and gives me all the light I need using off the shelf 12v car/off road lights.

 

[ruffruff]

Put a multi-meter on the wires and see what the voltage at the bike's headlight is.

 

[mjeds]

Put a multi-meter on the wires and see what the voltage at the bike's headlight is.

yup what I should have done instead of trusting customer support.

 

[6zfshdb]

I use a light that has a self contained lithium battery. I leave it connected to the USB port on the bike display so no direct wiring or voltage conversion is necessary. The light lasts from 2 to 8 hours depending on the output setting and recharges automatically via the USB when not in use. It also easily removes from the handlebars for use as a portable light. It comes in handy in situations where you need to work on the bike after dark. I chose the 12000 lumen Olight X7 Marauder but there are many similar products available.