POWER BANK WITH FLASHLIGHT

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We often find ourselves in situations where the battery of our device (tablet, smartphone, portable speaker, etc.) runs out and, moreover, we are far from the mains. In this case, a power bank can help us, but not everyone can afford expensive devices. I will tell you how to easily and easily make it, and it will also have a fairly powerful flashlight and a small flashlight for fine lighting.
The advantages of this device:

Easy to manufacture.
Inexpensive accessories.
Reliability.
Compactness.
Power.

For manufacturing you will need:
(Active store links)

Charge board for lithium batteries with overcharge protection.
Case (you can do it yourself or, as in my case, just find it).
10 white LEDs with a diameter of 5 mm.
1 red, 1 green and 1 blue LED with a diameter of 3 mm.
3 switches.
3.7V lithium battery (several can be used).
Converter voltage up to 5 volts.
1 resistor with resistance from 100 to 150 Ohms.

Brief explanation:
The charge board provides protection against strong discharge and overcharging the battery. Without a voltage converter, the phone will not charge. If resistors are not included in the circuit, then the LEDs simply do not overheat and burn out (it is better to take a high-power resistor so that it does not overheat). The number of white LEDs may vary or may not be included in the project at all. You can also neglect the green and red LEDs, they only serve for a more convenient charge indication. When choosing a battery, try to find one whose capacity will be greater than the capacity of your phone’s battery, so it can charge up to 100%, but of course you should not forget about the resistance, so you should choose a battery with a capacity of about 10-20 percent more.
Manufacturing process:
First of all, we need to determine the location of the switches, LEDs.
On the body we mark their locations.
Carefully make all the necessary holes with a drill and, if necessary, fix the files.
We solder all components according to the scheme (for a start, determine the rational length of the wires so that everything fits in the case and nothing interferes with anything). Everything is simple on the boards, there are already contact signs (+ and -), the white LEDs are soldered in parallel and connected via a resistor.

We put all the elements in place, for reliability you can glue everything.

PS: All components can be bought in online stores, so they will come out much cheaper. And if you will be assembling from several batteries, make sure that their voltages (V) match. At various values, the voltage will equalize and when connected to the charging modules, a high current will flow, due to which the board may burn. There are also more advanced models of charge modules (2 in

As a result, we have small dimensions and average power, of course you can increase it by choosing other modules.
When the battery is discharged, the red LED will light.