Hi guys,

Did you know you could build your own Li-Ion battery pack ?

Li-Ion batteries have the highest energy density per unit of mass available to us.

In comparison with LiPo batteries, you get 30% less weight for the same mAh capacity, which translates into direct endurance or increased flight autonomy.

Ready made LiIon batteries for dorne users are not mainstream (they are not sold on hobbyking, nor any other main RC online shops), and are quite expensive.

A DIY assembled pack is a fun project and will get you a much cheaper LiIon battery made to your custom requirements.

You can select individual cells based on their total capacity, based on how many amps they can continuously discharge.

You can then add them up in series to get the tight S voltage, and add them up in parallel to get the right minimum amps continuous discharge rate.

In the video I show how I've built a 4S battery which is able to output 30 amps continuously, with a 10 500 mAh capacity. It will be used on my 300 class folding quadcopter for an endurance test.



Views: 3402

Comment by Jon on October 30, 2017 at 4:52am

Thanks for sharing. I like the use of the copper garden labels. What temp did you set your soldering iron at?

Good luck with the endurance test.

Comment by Johnatan on October 30, 2017 at 6:14am

The final cover weights a lot!

Also welding is better approach.

Comment by Hugues on October 30, 2017 at 10:49am

@Jon, at 400 degrees Celsius. But if I had to suggest an improvement, it would be to use a more massive iron, maybe at lower temp, because my solder iron was barely able to solder quickly on these.

@Jonathan,Yes I lost 46g on cover!

Comment by Tom on October 31, 2017 at 1:14am

@Hugues, thanks for sharing i also built some smaller packs (mostly 2S for equipement) and use a 3D printed Case for protection. if i would build a lot more packs i would buy the "Boss Spot Welder"

Also the 3D printed snap in cases are nice.

Comment by Hugues on November 1, 2017 at 7:11am

Tom, thx. Cool link to this 3D printed case.

Comment by Hugues on November 1, 2017 at 7:12am

Oh great link to a diy spot welder, very nifty, thx

Comment by Bart Theys on November 3, 2017 at 11:26am

Where did you buy the cells? Looks like the solder is not flowing very happily :) . If a stronger soldering iron doesn't work you can try sanding the spots you wish to solder with a fine grain sandpaper first, this works good for me. 

Comment by Hugues on November 5, 2017 at 3:43am

I got the cells at https://eu.nkon.nl/

Yes my iron does not have enough heat capacity for that job. TIG/Spot solder is the way to go.

Comment by Tom on November 5, 2017 at 7:16am

Second nkon.nl, i get my cells also from them. They offer fair priced genuine cells and even add solder tags if you want.

Btw. i uploaded the case on thingiverse.

Comment by Ravi on November 5, 2017 at 7:39am

I had been using custom Li-Ion packs. when I used nickel strips for connections the strip would get hot and the voltage drops by 0.5V per pack or something and also the junction  heats up a little. I use good quality 18AWG wire stripped form silicon wires. that gives better performance. also these pure copper wires are much easier to solder. the solder sticks very easily.


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