DIY - 4S1P Li-Ion 18650 3400mAh Battery

Introduction: DIY - 4S1P Li-Ion 18650 3400mAh Battery

About: I love fly. Im a electronic, robotic and automation technician. I like drawing 3D parts.

I love flying and DIY.

I checked that some people fly a lot of time with wings with these batteries, so I decided to do my own 18650 battery.

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Step 1: What Do You Need?

18650 Li-Ion Batteries -

Solder Station -


Larger Iron tip -

40mm heat shrink tube -

Some silicon wires

4S balance connector, you can get it easily from one bad battery.

Step 2: Prepare Your Batteries to Solder

With one knife scrape both poles, plus and minus.

Step 3:

Join the 4 batteries with a measuring angle square and put some hot glue.

Step 4: Soldering

Put your solder iron at 350/400º degree.

Put iron solder for 2 seconds on the battery pole and put enough solder to wiring.

Step 5: Wiring

Step 6: Heat Shrink Cover

Cut a little piece of heat shrink tube more 20mm than length of 18650 battery.

Almost done!

Step 7: Already Done to Fly.

A comparison with Tattu R-line 1550mAh battery.

I can fly with my Reptile S800 Sky Shadow 40 minutes, important to say at 25% throttle.

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    4 Discussions


    8 weeks ago

    Be very careful, you can't make it like this.
    You must use a BMS to protect your battery from shortcut, overvoltage, current limit....
    Using like this is very dangerous, it there's any problem your battery can burnt and explode.
    Look for BMS and put it on your circuit.


    Reply 5 weeks ago

    Pourquoi un bms?
    Si il a un chargeur avec équilibrage il en a pas besoin?

    Uncle Kudzu
    Uncle Kudzu

    1 year ago

    Nice work! It looks very professional. Thanks for sharing links to the parts.

    That plane looks like it would be fun to fly.


    Reply 1 year ago

    Thank you.