This is the same thing as wiring all the main leads in parallel. with the 4 packs in parallel. All of the individual cells need to be wired in parallel too.
i feel like were either speaking diff languages or not on the same page hereā¦ there would be 10 packs in seriesā¦ each pack is a 1s8p ā¦ each packs positive would connect to the next packs negative until all 10 are connected. then the bms would plug into pack #1 negative side. the negative discharge cable on the bms hooks to an xt 90ā¦ and the main positive lead coming off pack 10 connects to same xt 90ā¦ are we all here now? (beside the charge cable and all disconnect connectors)
The conversation shifted to using 20 4s 5000mah lipos in a 12s 20ah battery. Thus all the discussion of parallel balance cables.
I guess its just a matter of time before a major accident involving lithium batteries on a passenger airplane occurs 
Not all airports and security personell know the risks involved.
SO what are you recommending?
I am looking at getting 8 of these and placing them in 10s 20ah config
You canāt make 10s with 4s lipos
THey are 5s 5000mah Edit: Forgot the link. Here it is https://hobbyking.com/en_us/zippy-compact-5000mah-5s-25c-lipo-pack.html
I think all of us are reccommending you donāt take 3 Mega Joules of energy on a plane. Iāve never seen someone experience a lipo fire then go airborne with it. Donāt take this in a disrespectful way or anything all in a safety perspective
I completely understand the concern. I have the same concern as well. The part that provides me with some comfort is that it happened during charging not while at rest. This is why I am not as hesitant to take them on a plane with PROPER SAFETY MEASURES such as pre-built packs and lipo fire bags.
Nope. Iām just down the way in Portland Oregon. I have a battery made by @barajabali thatās been running for 2 years. Still fully charges, still run great, still gives a ton of power. Bara is who I would recommend.
I messaged him and he said he isnāt building packs right now
Maybe I will spend the money on the safer lifepo4. Does anyone have any experience with them on esk8?
These cells look pretty good
Youāll want to make sure those cells fit inside your enclosure. Most are set up to fit 18650ās.
Those cells would make a huge but also cool pack
disregard!
Disregard what?
I had replied to your initial post with something that was already brought up in subsequent posts. Iām on mobile and skipped over it.
I thought it would say that I edited my msg
ah right! moar power already? =P