Replacing the headlight

[astroem1983]

I'm looking t replace the headlight on my Fiido M1 Pro 2025.
I found a headlight that I like and it has the correct connection plug.
It's the headlight from Duotts S26 e-bike and I can buy it from their store.
The problem is they seem to be convinced that it won't work with my bike.

If it's the same voltage (48V) on the bikes and the connection plug is the same as on my bike why wouldn't it work?
Do I need to consider something else?

I've seen the same headlight on eBay and it says universal and for 36V/48V.

 

[Atavar]

I would start by measuring the voltage at the headlight plug under load. Many bikes supply a lower voltage to the headlight. My Magicycle for example sources 6v to the headlight and taillights

 

[biknut]

I'm looking t replace the headlight on my Fiido M1 Pro 2025.
I found a headlight that I like and it has the correct connection plug.
It's the headlight from Duotts S26 e-bike and I can buy it from their store.
The problem is they seem to be convinced that it won't work with my bike.

If it's the same voltage (48V) on the bikes and the connection plug is the same as on my bike why wouldn't it work?
Do I need to consider something else?

I've seen the same headlight on eBay and it says universal and for 36V/48V.

The only reason I can think of why it wouldn't work if it the polarity is reversed on the plug.