Vintage Japanese Flashlight Restoration

Vintage Japanese Flashlight Restoration Video
Original Flashlight
6 D-batteries 1.2v x 6 = 7.2V
Light bulb 7.2V x 0.55A = 3.96W
Waterproof

New Flashlight
6 Lithium batteries 21700 3.7V 4500mah
Rechargeable Battery pack 10C 12V 9Ah 108Wh
Lamp bead 4.2V 30W 8A
Reflector diameter 11 cm
3.4 hours usage
Waterproof

Battery Information ($8)
Model: 21700
Size: 21 mm in diameter, 70 mm in length
Weight: about 68g
Rated voltage: 3.6V
Capacity: 4300-4500mah
Internal resistance: about 15
Charging voltage: 4.2V
Discharge cut-off voltage: 2.5V
Discharge current: 3C discharge (5C discharge can be achieved instantly)

BMS information ($2)
BMS 3 series 12.6V 20A lithium battery protection board (with recovery function-AUTO Recovery)
This product is an enhanced version: suitable for electric drills with starting current below 60A.
Scope of application: Lithium batteries with nominal voltages of 3.6V and 3.7V (including 18650, 26650, polymer lithium batteries)
Product size: 59*20*3.4 mm
Product weight: 4.3g
Charging voltage: 12.6V-13.0V
Continuous discharge current (upper limit): 20A (If the heat dissipation environment is not good, please reduce the load current to use)
Continuous charging current (upper limit): 10A

DC step-down converter (buck converter, $3)
Input voltage: 7 -32 V (without constant current, 5-32V)
Output voltage: (1) Continuously adjustable (0.8 -28V)
Output current: maximum 12A
Typical application: Adjustable power supply (12A power is large enough), high-power LED drive, LED display drive, lead-acid battery charging, lithium battery charging, car power supply, car laptop power supply (buck), regulated power supply, low-voltage system power supply, (such as children The toy car uses 12V battery to step down to 6V), 24V to 12V 12A \\12V to 5V 12A \\24V to 5V 12A \\24V to 19V20V, etc., the application range is very wide.

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I hope you find this video useful and enjoy it!
Not only that, but I am happy to receive feedback, suggestions to improve myself.
!!! I'm sorry for the mistake if I did in this video !!!
** I still keep some parts, I want to help the world environment **
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Have a nice day
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