I bought this flashlight from Japan recycle shop only 1$. This is vintage Japanese flashlight 3W powered by 4 batteries type D. It is obsolete, but I still find it useful. The flashlight case is designed to be waterproof and it remains good condition. Just make it rechargeable and change the headlights, it will be modern.
Total price for this project is 20$
Vintage Flashlight 1$
Lithium battery 6$
BMS 3S20A 1.5$
Female DC power jack 0.5$
12.6V liion charger 4$
Motorcycle LED headlights 5$
Other 2$

Motorcycle LED headlights
Voltage range 12V90V
Diameter 80mm
Lamp beads 8
Power consumption 18W
Light source 40W
Lumen 3000LM
Range 280m

Lithium battery cell
Model 1865034T
Type 3C
Capacity 3400mAh
Voltage 3.7V

Battery Pack
Voltage 12.6V
Ampere 6.8Ah
Power 80Wh
Charging time ~25min

Before Flashlights 4.5V, 3W
New Flashlights 12V, 40W

I hope you find this video useful and enjoy!
I am happy to receive feedback, suggestions to improve myself.
!!! I'm sorry for the mistake if I did this video !!!
** I still keep some parts, I want to help preserve the world environment **
Thank you very much for your likes, comments and subscribe!
Have a nice day
Gear Show