Most modern multifunctional gadgets have one annoying drawback - they are quickly discharged, especially in multitasking. Therefore, many owners of smartphones have already acquired a lifesaver in the form of a portable recharging device away from power sources. We will tell you in detail how to build such a power bank with your own hands.
What is Power Bank?
Power Bank is a portable battery with a capacity of 2 to 15 thousand mAh. The more such an indicator, the longer the device will be able to power your gadget. It is easy to use, having connected a turn-bank and a phone, a tablet - with a USB cable. It is quite easy to make such a power bank with your own hands from improvised materials.
These devices come in the following varieties:
- Lithium-ion - light, with no charge memory, high energy density, low k self-charging.
- Lithium-polymer - overtake the first type in energy density per unit volume, by weight.
- Equipped with a solar battery - the charge power depends on its area.
Some models are equipped with two or even several USB outputs for charging several gadgets at the same time, LED (light) indication or LCD display for displaying service information about the level and charging process, as well as an LED flashlight.
Power Bank from old telephone batteries
In order to make such a device, you will need from six to nine unnecessary, but working batteries from phones (it is advisable to select their capacity from 1200 mAh). A do-it-yourself power bank of telephone batteries is done according to this simple algorithm:
- Gently roll three batteries with tape - you will get two or three piles. Make sure that the terminals of all batteries look in one direction and do not cover with adhesive tape.
- Choose a suitable case for the device - a plastic box, a soap box.
- Soldering together the extreme terminals of all batteries is “plus” with “plus”, “minus” with minus. The middle terminal is a temperature sensor that allows you to find out the remaining capacity level. You can not touch it.
- Inside the case, draw the controller’s place from the edge, make a hole for the USB connector.
- Connect the batteries to the controller, then attach all the elements to the case with hot-melt adhesive.
- Close the case with a lid or glue the soap dish halves together - the pot-bank is ready! The device is enough for 4-5 recharges of a medium-power gadget.
DIY do-it-yourself power bank
To create such a mechanism you will need:
- eight lithium-ion finger batteries 18650 (3.6 V, 2200 mAh);
- automobile s / a for a mobile phone;
- housing from the vehicle relay unit;
- USB connector
Such a do-it-yourself bank (the connection diagram of the elements is presented above) is done according to the following instructions:
- Mark and drill holes for the USB output and future switch in the housing from the unit.
- According to the attached scheme, solder the batteries together in two blocks of 4 pieces.
- Place the elements in the case, attach them for reliability with hot melt adhesive.
- Solder the batteries to the on / off unit.
- Then connect the switch to the USB connector, relying on the notation in the diagram.
A power bank can fully charge a phone’s battery once or twice with a cable. To start the charging cycle, flip the switch to the "on" position, at the end do not forget to turn off the Power bank.
Finger-battery power bank
Necessary materials:
- several wiring;
- USB connector
- a box in which films are sold;
- a small plastic bottle (for drugs, vitamins);
- staples;
- spray can of deodorant or air freshener;
- wire;
- 2 matchboxes;
- 4 AA finger batteries.
How to make a do-it-yourself bank:
- Bending the top wall of each box from under the matches, glue them together with their bases, put two batteries inside each.
- Using the brackets, create a contact between the batteries from the two boxes, attach them with wire.
- Pack the device compactly in a film box.
- In the bottom of the plastic jar, make a hole for the USB output. Fix it inside the jar, solder the wires to it.
- Connect the USB connector to the batteries.
- Cut off the top of the can, fix the structure inside with hot-melt adhesive. The bottom will be the bottom of the jar with a USB output.
Power bank from a screwdriver battery
Such a do-it-yourself bank is made of:
- a suitable housing for the future device;
- s / a for the phone;
- toggle buttons;
- voltmeter;
- USB connector
- screwdriver battery (Li-ion 2000 mAh, 10 pieces of batteries 1865).
The idea is implemented as follows:
- Fasten three blocks of three batteries with electrical tape.
- Three are connected in series, three in parallel.
- In the case, make holes for the toggle switch and for the USB connector. Fasten these elements inside.
- The switch button here performs two tasks: one position - charging the device itself, the second - smartphone.
- Attach a voltmeter. Its function is to show the input current when recharging and display information about the device’s charge level.
Power Bank from a flashlight
To convert a flashlight into a Power bank, you will need:
- the lamp itself with a 3.7 volt battery;
- controller;
- a voltage converter with a USB output (so that 3.7 volts reach the desired 5).
DIY power bank:
- Remove the flashlight resistor to which the LED is attached - to change the "bright light" mode to the power bank.
- Remove the plug with which the flashlight was charged, replace it with a USB output with a current converter.
- Solder the "+" and "-" batteries of the flashlight to the controller.
- Locate the “OUT +” and “OUT-” pins on the controller. They need to connect a 5-volt converter.
- Before working with the switch, release one of its contacts. Then solder the converter directly to it.
- Perform a check of the inverter operation. If the result is unsatisfactory, you can re-solder the contacts at this stage.
- Upon successful testing with epoxy glue, carefully attach both the controller and the converter to the body of the former flashlight.
- Assemble the design - you now have a power bank of an unusual shape.
The purchase of a power bank sometimes becomes necessary when buying a gadget, especially with a large screen that “eats” the lion's share of the charge. However, with a minimum level of skills, this useful device is quite possible to assemble yourself. We hope that our advice helped you in the latter.