18650 Battery Charger




About: 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 cool, new exciting innovative things!! I've been involved in electroni...

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

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

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

Add the tape on the backs of the TP4056 boards.

Also add tape on the back of the battery holder.

Step 5: Battery Holder

Now place the battery holder onto the piece of wood.

Step 6: TP4056

Now add the TP4056 boards above the battery holder.

Step 7: Negative

Solder the negative wire to the corresponding negative pin.

Step 8: Positive

Solder the positive wire to the corresponding positive pin.

Step 9: Batteries

Put the batteries in the slots.

Step 10: Test

Test each board to make sure it turns on.


You just built your very own 18650 battery charger!

3 People Made This Project!


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36 Discussions


2 years ago

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

3 replies

2 years ago

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!!!!

2 replies

Reply 2 years ago

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


2 years ago

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.

1 reply

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


2 years ago

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


2 years ago

I feel stupider from watching this instructable ;)


Reply 2 years ago

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!


2 years 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 embarrasing.

2 replies

Reply 2 years ago

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


2 years ago

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.