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Compact charger with magnetic locks for Li-Ion batteries

Hello dear readers andthe inhabitants of our site!
Surely many of you have devices that use 3.7 V batteries to power, but do not have a built-in charger fixtures.

In this article, the author of the KJDOT YouTube channel will tell you how he made a simple charger with a built-in voltage indicator.

Homemade is very easy to manufacture, and can be easily repeated by you in home conditions. This simple device can not only charge the batteries, but also quickly find out the current charge level.

Materials
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— 
- Flat cable trim
- Round neodymium magnets
- sheet plywood
- PVC tube
- solder
- Second glue
- Sandpaper.

Instruments, used by the author.
- A hot knife for cutting plastic (about its manufacture is described in this article)
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- tweezers
- Marker, knife, wire cutters, compasses.

Manufacturing process.
First of all, the master notes the necessary tube size with an inner diameter of 18 mm for the main body, in which it will be located electronics. He cuts off the tube with a hot knife, and strips the ends of the tube with sandpaper.



Now he needs to mark and cut a hole in the housing for the screen of a digital voltmeter.



The ears of the voltmeter are not required, they can be bitten. Then the screen is installed in its place, and fixed with a second glue on the inside of the case.



Then, having measured the exact diameter of the tube, the master cuts a circle from a piece of plywood. Its external sides are ground.



A hole for the MicroUSB connector and a shallow groove for the board are cut out in the mug. The charge controller board is glued in place. It is important to prevent glue from entering the connector.



To the left of the connector, the master pierced a small hole, and inserted a light-conducting fiber into it. Its edge is fixed with a second glue directly to the LED, which shows the charge mode.Excess fiber is cut off with wire cutters.




As a connecting wire for the response terminal, the author uses a flat cable from old headphones. Makes a slot in the case, and pulls the cable through it.


Now it is necessary to solder the simplest circuit by connecting a voltmeter to the “OUT” terminals, and the contact pads to “B +” and “B-”.

The wires are carefully peeled and soldered into place. It is convenient to use a "third hand" for this.



The charge controller with a plug is inserted into the case, and is fixed with glue.

The wire is stripped and inserted into the prepared disk. Then a magnet is glued, and a contact is formed inside it.





The contact area slides into the body and adheres.

In a similar way, the master made the return terminal.





That's all ready, now, just by inserting the battery, you can check its charge level. The first author to experience the most common 18650.



Then the batteries of other sizes. Namely 18350, 14500, 16340. All of them have the same rated voltage of 3.7 V.



Now you can connect the power supply, or use a computer USB connector.


I thank the author for a simple but useful device for charging batteries!
All good mood, good luck, and interesting ideas!

Author video can be found here.
10
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9.5

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5 comments
Alexey Evgenievich
When polarity reversed TP4056 fades into smoke
I managed to step on this rake several times! yes
Leobrynn
It is very easy to solve.
Not a fact, in most cans "from a laptop" the positive contact does not protrude beyond the plane of the external side of the case. nea
Apparently, neodymium magnets are used.
Quote from the properties of a neodymium magnet: The magnetic properties of a magnet when exposed to high temperature are lost forever. Depending on the current brand of magnet, the heating limit can be in the range of 80-250 degrees Celsius. In the case of heating above the standard temperature, all the properties of the magnet are lost.
Or I'm wrong?
Author
It is very easy to solve. On the positive terminal, it is enough to make a restrictive ring around the contact, which will prevent connecting to the negative terminal of the battery. ok
Alexey Evgenievich
When the polarity reversal TP4056 burns out in smoke, protection is not provided! this is awesome minus design

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