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DIY 18650 Battery Charger

Electronics / Power supplies
Added 13 comments

Rechargeable batteries of the 18650 type are very popular now. They are used in power banks, powerful flashlights, laser pointers, portable speakers and for various homemade. Sold both with a charger and separately.

In this article I will tell you how to make a simple charger for these batteries.

Assembling and testing the charger for reference.


We will need:
1. Syringe 20ml
2.2 copper wiring
3. A spring from the battery holder (from old equipment or toys)
4. 18650 lithium battery charge module on TP4056 5V 1A with micro USB interface ()
5. Hot melt adhesive
6. Battery type 18650 ()

From the tools:
1. Soldering iron
2. Glue gun
3. Stationery knife

Step 1
We will need a 20ml medical syringe

and a 18650 battery.

The syringe is ideal for the size of the battery.


Step 2
We cut off the tip of the syringe with a clerical knife (where the needle is inserted) so that it does not interfere with us in further operation.


Step 3
We take a spring from the battery holders from old equipment (for example, from the remote control or toys).


Pass the copper wires from below into the hole and fasten it to the coil of the spring as shown in the photo.


Step 4
Next, place the wire with the spring in the inside of the syringe and thread the wire through the hole where the nozzle of the syringe was cut off. We fix the wire in the hole with hot glue.


Step 5
We take a module for charging 18650 lithium batteries on TP4056 5V 1A with a micro USB interface and attach it with hot melt adhesive to the syringe in a convenient place.

Observing the polarity, we bring the wires to the module and solder them with a soldering iron. You can isolate the module from the outside world with transparent tape.

A little about the TP4056 5V 1A module. ()
Designed to charge lithium batteries 3.7V current up to 1A. Due to the size and micro USB connector, this module is easily integrated into various devices and can serve as an alternative replacement for failed lithium battery chargers. It supports various types of lithium batteries, including the popular 18650. The module is not protected from reverse (not polarity-correct) connections, so be careful when connecting batteries.

Step 6
Cut off a small piece from the syringe piston at the base with an elastic band, as shown in the photo. This will fix the battery inside the syringe.


Step 7
We make a hole in the syringe for copper wiring so that it can touch the positive contact of the battery.
The hole must be made at a level when the battery is not fixed by the piston of the syringe. The photo shows that I mistakenly made one bottom hole in the locked position of the battery.



Step 8
After the wire is passed through the hole made and the piston is fixed with a piston, you can start the test of the charger.

The charger is stable. The battery does not heat up while charging.

Thanks to the indication on the module, it is possible to monitor the charging process (red LED) and the completion of the battery charge process (blue LED). The device is relevant due to the low cost of consumables for a homemade charger and not a complicated design.

You can also make 20 ml syringes and holders for this type of battery and use them in various homemade products.
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13 comments
0
Reply To quote A complaint
A module would look prettier inside the tube - the piston is not really needed in this design, and there is a neat cap. What about controversy smiles
Author 0
Reply To quote A complaint
No, not this video. I saw something similar for a long time on the network, but in that case we used such a holder to power a home-made device. I had to remove the battery to charge.
+1
Reply To quote A complaint
Wasn't this inspired by the hour?
Author +4
Reply To quote A complaint
Pissed off? The fact that nothing against you (sorry "you") had? Of course, hurried with insults. Respect for the opponent comes first, not literacy. But I observe the opposite. It's like smiling in the face, but holding a knife behind your back. Slandering a person, not knowing him at all, is low, and as you put it, the act of a "small illiterate child" who is trying to offend a person when he cannot find other arguments for his innocence.
The dispute was formed out of the blue. You expressed an opinion on my "opus", I explained why I did it. Speak out, good! Others may use it, or maybe they will have their own ideas for improvement. I’m not doing it perfectly (and it’s unlikely to work out), but I give the opportunity to move my brains and make my own changes or improvements to homemade work (your first comment).
If you are hurt how I appeal to you, then this is not an indicator of respect for the interlocutor. It's just that I'm used to typing like this. We are not in a lesson in the Great Russian language and no one (so far) obliges us to write according to all the rules.
-6
Reply To quote A complaint
Quote: Mike Ike
I have no complaints about you.

Sir, Mike ike, you angered me seriously. What claims can you have to me. I gave you practical advice on how to improve your homemade trinket, and you still have some complaints to me? You are nothing more than a small, illiterate, narcissistic child who does not even understand (or does not know) that an appeal to an opponent (you, you, you, etc.) is written with a capital letter.
I will never comment on your "opus" again, and I urge other site members to do so. Put yourself the "pros" yourself, I'm sure you know how to do it.
Author 0
Reply To quote A complaint
I have no complaints about you. I replied why I refused full contact on the piston. From the side, someone else’s homemade product I always want to modify for myself or have thoughts on how to make it better, I myself am. I show how to do it. And already relying on this, you can connect your imagination and do as you want or as best for yourself.
0
Reply To quote A complaint
Quote: Mike Ike
Those who need it will modify it to their needs. Comments on this matter are useless.

But this is the wrong attitude. They are trying to help you, suggest, advise, teach you how to do it better. But, if you are so self-confident in your opinion and in your technical literacy, then excuse us "fools" for treating your homemade product with interest.
Author +1
Reply To quote A complaint
Well, yes, on the one hand.

Well, it’s not customary to put springs on both sides)

Your assurances - the argument is insufficient ("mother Klyanus, Harosha Mandaryn"), since there is no normal fixation from the open end of the syringe.

Without testing and not being convinced of working capacity, I would not write similar.

From hopelessness - yes, it can be applied as a last resort, but only if the clip is finalized.

If for use as a holder, then yes, it is better to modify it. I made a charger and mentioned that a holder can be made from a syringe separately.

In this article I will tell you how to make a simple charger for these batteries.

The emphasis was on the simple execution of the design and using a minimum of components, which anyone can repeat. Those who need it will modify it to their needs. Comments on this matter are useless.
Author 0
Reply To quote A complaint
Initially, he planned to make a full contact, even picked up by size. But soldering the wire to the contact on the moving part there is a risk that the wire comes off or breaks from frequent manipulations (the piston sits tight enough). This made it easier through the hole at the plus level of the battery (it does not accidentally come off, simple connection and disconnection). I show one of the options for implementation.
0
Reply To quote A complaint
Quote: Mike Ike
There is a spring.
Well, yes, on the one hand.
Quote: Mike Ike
I can assure you that in the work it is not inferior to the purchased holder and everything is fixed securely.

Your assurances - the argument is insufficient ("mother Klyanus, Harosha Mandaryn"), since there is no normal fixation from the open end of the syringe.
Quote: Mike Ike
This homemade product in case there are no holders available.
From hopelessness - yes, it can be applied as a last resort, but only subject to finalization of the clamp. Therefore no need to offer in this performance
use them in various fakes.
0
Reply To quote A complaint
Quote: Mike Ike
There is a spring.

Ivan_Pokhmelev explains to you that the positive contact in your homemade product is not very reliable, because made "on snot".
Tip: take our five-penny coin, irradiate it with tin using a soldering iron (preferably on both sides) and solder it as a positive contact of your memory (it will fit perfectly in size). So it will be more reliable.
Author +1
Reply To quote A complaint
There is a spring. The design is simple, at first glance it seems not reliable. I can assure you that in the work it is not inferior to the purchased holder and everything is fixed securely. This homemade product in case there are no holders available.
+1
Reply To quote A complaint
If you already bought a charge module and a battery, then it was logical and correct to buy a holder for the battery. A “snotty” connection with a non-spring loaded wiring will not provide normal contact, the current of 1 A, of course, is not gigantic, but not so small as to completely neglect the transition resistance.

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