Introduction: 18650 Battery Charger

Picture of 18650 Battery Charger

Hey guys Kester here! Today I'll be showing you guys how to make a 18650 battery charger! Without further a do, let's get started!

Step 1: Patreon

Picture of Patreon

As you may or may not know, I am Kester. I have a YouTube channel that is based on making electronics videos and diy videos and tutorials. As me making lots of videos and putting time and lots of effort and money into producing products and videos, I would like to get some support from my fellow fans to help me keep up with producing more content and projects for you guys. So on behalf, I would like to show you guys Patreon. Patreon helps support fellow DIY'ers and people who need help from the fans and supporters to keep content flowing for their fans to enjoy. So what I'm asking for is a donation from you guys to keep my content going and to make my fans happy by producing more content! Thanks again for all of your support. Be sure to check out my YouTube channel and my Patreon account! Thanks guys!



Step 2: Video

Step 3: Components Needed

Picture of Components Needed

You will need the following components:

- 3.5 Inches by 4.5 Inches Piece of Wood
- (4) 18650 Batteries
- (4) TP4056 Charging Modules
- 18650 Battery Holder
- Double Sided Tape

Step 4: Tape

Picture of Tape

Add the tape on the backs of the TP4056 boards.

Also add tape on the back of the battery holder.

Step 5: Battery Holder

Picture of Battery Holder

Now place the battery holder onto the piece of wood.

Step 6: TP4056

Picture of TP4056

Now add the TP4056 boards above the battery holder.

Step 7: Negative

Picture of Negative

Solder the negative wire to the corresponding negative pin.

Step 8: Positive

Picture of Positive

Solder the positive wire to the corresponding positive pin.

Step 9: Batteries

Picture of Batteries

Put the batteries in the slots.

Step 10: Test

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Test each board to make sure it turns on.



You just built your very own 18650 battery charger!


sergeike made it! (author)2016-12-25

Did it my way.

Tinker_001 (author)2016-10-23

It's just a different version of this one ->

from more than a year ago. User

has a better explanation of the mighty TP4056 Charger.

pepy (author)2016-10-18

the TP4056 have no battery protection/over charge protection???

Julian's video does a good job reviewing the TP4056

tp4056 with battery protection

thanks dude, i'll check it out ,,,,,,

i have made the charger like so, a year ago anyway...

WarHawk-AVG (author)2016-10-16

Nice those TP4056 boards don't have reverse polarity protection, so if
the batteries are put in backwards it destroys the chip, there are newer
boards out (for dirt cheap to) that have a battery protection chip on
it DW01-G that prevent damage if batteries are put in backwards, also you can
daisy chain the input + and - and use an old ATX powersupply 5vdc output
to run the entire thing at one time (or use a USB cable but with 4
boards the current draw of 4 chargers running can be too much for the
cord) There is also 3d printable battery holders in different sizes you
can print, and if you change the rprog resistor to 2.2K ohm you can get
500mA charge rate instead of 1A. Very cool build!!!!

Thanks for the tip on the DW01-G. And those 3d printable battery holders look slick.

mrandle (author)WarHawk-AVG2016-10-16

You could maybe just add a diode to the end that would prevent reverse polarity breaking the boards.

Teletwanger (author)2016-10-17

18650's are individual cells, not batteries. All you did was to solder 2 wires to attach a cell holder to an existing charger. Those cells have to be charged with extreme care. Make a simple mistake and an 18650 could quickly overheat, resulting in an intense fire or explosion. Here's a scenario to consider: one of the cells gets mistakenly inserted backwards, or something causes a short on the cell or the board, quickly melting the adhesive in that tape, causing everything to become unattached from the wood. Those cells and the charging circuits can get quite hot while charging. When they do catch fire or explode, it happens violently, usually without warning. Chemical fires can be difficult to extinguish. Then to top it off, you taped everything to a piece of wood, which adds another fuel to the fire. Let's not forget about the plastic holder, which will melt and burn the fastest, maybe it's metal parts falling off and causing another cell to short out With 4 separate charging circuits, the risk of fire or explosion is now 4 times greater. If one of those cells catches fire, it would be difficult to extinguish it before the resulting heat causes one, or all of the other cells to ignite or explode. Think about it dude. Please read some datasheets from those 18650 cells. The warnings about charging them are there for a reason.

I've made the mistake of putting a cell into the holder backwards and the module fried very quickly but there was no fire at all.

I've been using those little Lion chargers for two years now with no problems. One charger per battery. This is interesting. Thanks for the Ible Kester1

MR_Huns made it! (author)2016-10-22

I used this TP4056 for an Arduino UNO power shield along with a +5 boost board. My senior project leader pointed this out to me today...

gristlehead (author)2016-10-20

For every 10 Instructables, you find 4 that aren't that helpful. This is all 4 rolled into one.

alCHMist (author)2016-10-18

I feel stupider from watching this instructable ;)

petebarchetta (author)2016-10-14

How does this allow for battery balancing?

alCHMist (author)petebarchetta2016-10-18

that question is almost as lame as the guy who posted this instructable! it's 4 separate charging circuits charging 1 cell individually not 1 circuit charging 4 cells where it would need to balance them. I agree with RobAnus very embarrassing!

RobnAus (author)2016-10-16

This instructable is as lame as your huge begging for a tiny you tube channel. I won't repeat what others have said but taking a few off the shelf boards and giving us instructions on how to tape them to a piece of wood is embarrasing.

lsmith34 (author)RobnAus2016-10-18

RobAnus, your instructables are lame,,,,,oh wait

JohnC430 (author)RobnAus2016-10-16

yeah, I agree.

ve3vxy (author)2016-10-17

this is for hobby and please keep it so, I have spent lots of money on the hobby but I don't cry about it. Buy the way your projects don't help me.

LulithaG (author)2016-10-16


MicX1 (author)2016-10-16

A 4x18650 powerbank costs about 2.5€ w/o batteries...

JohnC430 (author)MicX12016-10-16

"A 4x18650 powerbank" what does that mean? and whats the significance of that remark? i did not understand. please explain. Thanks.

Cubbybearks (author)2016-10-16

Should have done the instructable first lost interest with the PBS style of ask for money first then show what you clicked for

JohnC430 (author)Cubbybearks2016-10-16

Yeah! and what you clicked for is just to assemble a few parts together. I thought I would at least see a schematic of a LiPo battery charger.

JohnC430 (author)2016-10-16


6 hours ago

This instructable is as lame as
your huge begging for a tiny you tube channel. I won't repeat what
others have said but taking a few off the shelf boards and giving us
instructions on how to tape them to a piece of wood is embarrassing.

I agree with RobnAus what you did is not nice. well maybe he said it a little more forcefully than I would have, but he conveyed the sentiment quite well.

lathe_makeatio (author)2016-10-15

Do i see it right, that every of the 4 batteries has to be
charged/uncharged separately? Wouldn't it make sense to connect the
micro USB ports parallel? While charging powered with parallel usb ports, every battery will be save and a balancing is not needed because of it's separate electronic.

The only question which stays, is if the batterys will drain each other in standby through the paralell electronics?

JohnC430 (author)lathe_makeatio2016-10-16

why put them in parallel when eventually u are going to charge each battery individually. He did it correctly. no need for balancing since they are being charged individually.

Kester1 (author)lathe_makeatio2016-10-15

I need them to individually charge for a future project that I am doing. You will see! ;)

WannaDuino (author)2016-10-16

sorry but this is just a no no.

its for some people verry unlogic and probebly they also dont get it.

you could only do it with 1 charcher bord and a battery.

yeah you say it for an UPCOMMING project,

but that does not make this a clear IBLE.

its raising a lot of questions becous you just did a 1 project 4 times in this video.

but ok its simple and not usefull.

NTT (author)2016-10-16

You've omitted a VERY important detail in your Instructable here. I'm hoping you've snipped the connecting wires in the battery holder that connect the cells in series.

If you did (and you should have; to allow balancing from the charging units), you need to clearly state it. Otherwise the charging units and/or the cell(s) will fail.

Suraj Bhawal (author)2016-10-14

I don't see any videos on your YouTube channel.....

Kester1 (author)Suraj Bhawal2016-10-15

They are on there. Check again! :)

rbclima (author)2016-10-15

I would put the batteries in parallel and use only one charger

Kester1 (author)rbclima2016-10-15

I need them separately charging for a future project... you will see! ;)

acheide (author)2016-10-13

Looks like tomas.raila.3beat you to the punch.

About This Instructable




Bio: Hey Guys! KESTER here! I have a passion for electronics! I love making videos of me showing you guys how to make electronic gadgets and ... More »
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