Super lamp led DIY open source

This is a versatile flashlight, with a budget of €9 each, you will illuminate 160Lm for 2 hours then less and less up to 2 days continuously, at the end and you will still be able to move widely with the remaining light.
You can add these lamps according to your outdoor activities, in terms of lighting needed and redundancy in the risk taken, night walking, cycling, household appliance repairs, car repair, night skiing, badminton court lighting.

The lamp integrates its own BMS (battery management system) it's up to you to choose it compatible with your phone charger connector. (hot glue the BMS if it too small to stay in place).
For the li ion 18650 battery you can recover batteries from other devices or source a
Or find a quality dealer in your country (But do not import batteries by air if put off by security, they will never arrive). A reduce the height of slide button to prevent the lamp from turning on in your bag.

You have to reform the battery clips with pliers. The led