# Question about cheaper cells
**URL:** https://foil.zone/t/question-about-cheaper-cells/8878
**Category:** Electronics (ESC, remote, batteries)
**Created:** [August 2, 2020, 1:22pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878 "2020-08-02T13:22:55Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@levitater](https://foil.zone/u/levitater)
#### Post date: [August 2, 2020, 1:22pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/1 "2020-08-02T13:22:55Z")
Hi!
I am currently trying to figure out, which cells I should use for my battery pack.
After reading through the forum I saw many successful builds with Samsung 30Q Cells.
The problem for me is, that these cells are really expensive (500€+ for 12s 12p pack)
Due to this I did some research and found a company near to my hometown, who would sell me used ebike cells for a very good price (0,4€ per cell).
The cells are Sanyo 18650 2200mah with a max discharge of 10A.
I already bought 30 cells for testing, and I think they are in a very good condition. Nearly all of them have 2150-2220 mah of capacity and an internal resistance of \<50 mOhm.
Now my Question is, if it is realistic to use these cells for an efoil?
My plan is to use a 63100 motor and a Vesc 6.
As we can see at @V_S build, it is possible to run this setup with 120A motor current.
If I am now building a 12s 15p battery pack, each cell of my pack would have to draw 8A.
Do you think this could be a cheap alternative to all the really expensive battery packs?
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### Author:  [@V\_S](https://foil.zone/u/V_S)
#### Post date: [August 2, 2020, 1:39pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/2 "2020-08-02T13:39:12Z")
I am running 120A Motorcurrent with 85A Batterycurrent 😉
That equals 5,66A each cell with 15p
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### Author:  [@Toto44](https://foil.zone/u/Toto44)
#### Post date: [August 2, 2020, 1:49pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/3 "2020-08-02T13:49:42Z")
50mOhm is quite high this might produce a lot of heat inside your pack
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### Author:  [@V\_S](https://foil.zone/u/V_S)
#### Post date: [August 2, 2020, 1:58pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/4 "2020-08-02T13:58:36Z")
Average current is 30A on battery. Thats 0,2W each cell, or 36W / Pack
All i can say, my 16p 30Q stay cool
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### Author:  [@Toto44](https://foil.zone/u/Toto44)
#### Post date: [August 2, 2020, 5:24pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/5 "2020-08-02T17:24:27Z")
Sure because your 30q cells will be in the sub 3 mOhm area, not 50!
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### Author:  [@Rienk](https://foil.zone/u/Rienk)
#### Post date: [August 2, 2020, 5:57pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/6 "2020-08-02T17:57:45Z")
30Q and VTC6 are around 12mOhm. Lowest internal resistance is the Sony VTC5A with 9-10mOhm.
I personaly would not go for batteries with internal resistance higher than 20mOhm. My 14s11p VTC6 batteries can get 45°C after an average discharge of around 1C (33A)
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### Author:  [@Rienk](https://foil.zone/u/Rienk)
#### Post date: [August 2, 2020, 6:16pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/7 "2020-08-02T18:16:45Z")
Some example with 50mOhm12S12P at 30A discharge:
30A/12 = 2,5A cell
2,5A x 50mOhm = 0,125V voltage drop
2,5A x 0,125V = 0,3125W
0,3125W x 144 = 45W
So the total power in heat is 45W. This is like a medium soldering iron heating up your battery.
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### Author:  [@JvdZ](https://foil.zone/u/JvdZ)
#### Post date: [August 2, 2020, 6:34pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/8 "2020-08-02T18:34:44Z")
I have used a similar cell source, used ebike batteries. All tested and matched up to form an equal pack.
Mine are \<35mOhm, the 12s12p pack does get warm (50degree?) during discharge but all acceptable.
My cells to compare the specs: [LG LGDBMG11865 Cell Specifications | Second Life Storage & Solar](https://secondlifestorage.com/showthread.php?tid=6431)
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### Author:  [@levitater](https://foil.zone/u/levitater)
#### Post date: [August 2, 2020, 8:23pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/9 "2020-08-02T20:23:36Z")
So you already fly with these cells?
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### Author:  [@JvdZ](https://foil.zone/u/JvdZ)
#### Post date: [August 2, 2020, 9:12pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/10 "2020-08-02T21:12:02Z")
Yes, about 35min flight time with inefficient chinese gearbox.
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### Author:  [@Flightjunkie](https://foil.zone/u/Flightjunkie)
#### Post date: [August 2, 2020, 10:38pm UTC](https://foil.zone/t/question-about-cheaper-cells/8878/11 "2020-08-02T22:38:14Z")
Hi.
I wouldn’t do it. It’s so labor intensive building a pack. And the dangers of cell failure in a KWH size battery is quite high.
Those cells will get hot! 70°C is 160°F! Wow…that will practically melt the plastic parts.
Just buy Samsung 30Q or Sony VT6. I prefer the 30Qs.
I pull 200A from my battery. I like to tow foil boards with my e-foil. I need the power.
🤙