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.
cheers,
Hugues
Comments
needless to say Li-Ion 18650GA cells give excellent performance.
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.
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.
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.
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.
Oh great link to a diy spot welder, very nifty, thx
Tom, thx. Cool link to this 3D printed case.
@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.
@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!
The final cover weights a lot!
Also welding is better approach.
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