Build Flashlight for 18V Bosch Battery

I have been using this type of flashlight for a year, and it is pretty easy to use. That's why I made this video to show you all. This flashlight has 3 modes: very bright, normal light and flashing light. With this battery (20V 6Ah 120WAh), we can use 6 hours with very bright mode, 17 hours with normal light mode and 12 hours with flashing mode. BOSCH 6.0 Ah 20V Li-Ion - Voltage 18V ~ 20V - Capacity 6Ah - 10 cell of lithium-Ion 18650 Lithium-ion battery cell - Brand model: LG INR18650HG2 - Standard capacity: 2800- 3000mAh - Rated voltage: - Charging voltage: 4.2± - Maximum continuous discharge current: 20A - Discharge cut-off voltage: - Weight: - Size: ×65.2 mm - Charge and discharge times: 500 times I hope you find this video useful and enjoy it! Furthermore, I am happy to receive feedback, suggestions to improve myself. !!! I'm sorry for the mistake if I did in this video !&