Thanks for starting this thread Katy!

I've been looking into 6S2P configurations using two groups of 30A 18650 in parallel so 60A on paper. Theoretically it should work right?

Here is an easy to make spot welder.

I will be soldering up a 4S lion pack this weekend. I was looking through videos of my more mellow flights with The Japalura and it appears that it will be working fine as long as I keep the throttle under control.

I am considering duplicating the profile in the Q7x and then limiting the throttle to about 60% or so. I usually fly at around 35% throttle, so that gives me plenty of range for mellow flight while safely staying under 13A draw. It will at least give me an idea of what I can expect

(10-Jan-2020, 06:17 PM)voodoo614 Wrote: Here is an easy to make spot welder.

I bought a motorcycle battery to make one with.  The video makes it look so simple!

Spot welding is how all the cool peeps do it!   Look forward to your review, Kaity!

Sick. Been studying this a lot lately. Looking forward to see your custom li-ion packs!!

A cool idea I saw to get 60A is to make 2 separate 6S1P 30A packs then plug them in parallel. One up top and one down below.

The car battery spot weld method is far easier than my MOT spot welder. Especially if you are just using it for batteries spot welding.

So after spot welding, you just add the balance leads to the nickel strips with normal soldering?
Edit: I used to make my own packs with A123 cells by hand soldering. A123 are similar to Li-ion.

(11-Jan-2020, 10:16 PM)sloscotty Wrote: So after spot welding, you just add the balance leads to the nickel strips with normal soldering?
Edit: I used to make my own packs with A123 cells by hand soldering. A123 are similar to Li-ion.

I usually add the balance wire prior to spot welding. Otherwise, it defeats the purpose of spot welding. Check out my thread on making a Fatshark pack.

https://intofpv.com/t-big-better-fatshark-pack

Okay, am soldering. Will mess with creating the spot welder later. For now, lead and copper will have to do!

A lot of videos I've seen including Pavel "Trust Me I'm An Enginner" Spekowlski (sp?) just use soldering so I'm sure you'll be ok.

Are you doing a 4S1P with 20A 18650s?

Yes...



Between gardening sessions

(12-Jan-2020, 10:39 PM)kaitylynn Wrote: Yes...

Between gardening sessions

This is looking quite good!
I've got a whole bunch of 18650's lying around, i've been working on an idea i've had that has a LiPo bank and a Li-Ion bank, the lipo is what powers the quad and the li-ion uses a constant slow discharge through the use of a charge controller into the Lipo. The power setup would be similar to the Solar Plane that rctestflight did except instead of solar panels it would have a li-ion bank.
The plan would be to run off of the lipo until it gets to a threshold, then a mosfet turns on the charge controller and it just keeps the lipo at say 16V (except under heavy load) until the li-ions are depleted and then run off of the lipo until its flat.
Theoretically this could give up to 30-50% more capacity with the same weight with not much performance disadvantage. Not really practical for your small build though

(12-Jan-2020, 07:33 PM)the.ronin Wrote: A lot of videos I've seen including Pavel "Trust Me I'm An Enginner" Spekowlski (sp?) j

Oh, be careful, Pavel is Snow's love muffin.  

LOLLL I wanna ask so badly but I won't.