# eFoil Battery Build: Video Tutorial
**URL:** https://foil.zone/t/efoil-battery-build-video-tutorial/18891
**Category:** Electronics (ESC, remote, batteries)
**Created:** [August 18, 2023, 5:48pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891 "2023-08-18T17:48:02Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [August 18, 2023, 5:48pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/1 "2023-08-18T17:48:02Z")
Hi everybody,
As I am currently building a 2nd battery for one of my eFoils, I thought I might share my way of designing and building such a battery pack. Hoping this may help some of the beginners to get into that (sometimes a bit frightening) topic.
First part:
Feel free to share your thoughts and what you would do differently 🙂
[ ](https://www.youtube.com/watch?v=sgQdSsx1Pwk)
---
### Author:  [@macfly1202](https://foil.zone/u/macfly1202)
#### Post date: [August 19, 2023, 12:26pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/2 "2023-08-19T12:26:07Z")
Excellent video ! thanks for sharing. I realize that I assembled my Li-Ion cell nickel strip first in parallel then in series like you mention. Do you really think I need to remove restart from zero my pack ? I use nickel 0.2 10mm on 21700 (40T3) on 12S8P.
---
### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [August 19, 2023, 2:04pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/3 "2023-08-19T14:04:50Z")
Don’t worry too much about that, keep it in mind for the next pack 🙂
---
### Author:  [@macfly1202](https://foil.zone/u/macfly1202)
#### Post date: [August 20, 2023, 5:00pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/4 "2023-08-20T17:00:34Z")
thanks @ludwig_bre I will share my assembly in few days when finalized. Thanks again for your great video.
---
### Author:  [@th3v3rn](https://foil.zone/u/th3v3rn)
#### Post date: [August 21, 2023, 12:20am UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/5 "2023-08-21T00:20:51Z")
Good watch. Trying to digest as much as I can before building a battery.
So if I build a 12s battery and just want a single pair of cables and not split it into 2 6s packs what are recommended chargers? Just any of the million 50.4v Chinese chargers? What amperage should I look for? I will run a bms for charging, just not discharging.
---
### Author:  [@sat\_be](https://foil.zone/u/sat_be)
#### Post date: [August 21, 2023, 1:42am UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/6 "2023-08-21T01:42:32Z")
A built in bms or a \>=12S Charger, like ISDTx16 (not cheap).
---
### Author:  [@th3v3rn](https://foil.zone/u/th3v3rn)
#### Post date: [August 21, 2023, 1:57am UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/7 "2023-08-21T01:57:56Z")
So use a 50.4v charger with a BMS?
---
### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [August 21, 2023, 10:40am UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/8 "2023-08-21T10:40:11Z")
These questions will be answered in the 2nd video 😛 But already as a teaser:
Option 1: Build charger yourself from PC/Server PSU and a Step-Up regulator (my way)
Option 2: Buy cheap chinese charger
For both 1 and 2 you need a BMS or at least a balancer, either external or internal.
Option 3: Buy a 12S Balance Charger
---
### Author:  [@Roman](https://foil.zone/u/Roman)
#### Post date: [September 25, 2023, 12:25pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/9 "2023-09-25T12:25:54Z")
Guys, sorry for the comment that is just partly related to the topic.
Ludwig, thank you for the video. You seems really experienced in this field. So maybe you know how could I restart the BMS or current settings and memory of the Lift Efoil battery?
Or I need to build mine from scratch and it would be easier? 😅
---
### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [September 25, 2023, 9:44pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/10 "2023-09-25T21:44:44Z")
Sorry, no experience with Lift
There was a topic here about that though, maybe there you find some information:
> [@Cutting open commercial batteries! (Lift, Onean, Flite, etc.)](https://foil.zone/t/cutting-open-commercial-batteries-lift-onean-flite-etc/10490):
>
> I took the gamble on purchasing a dead Lift battery which I am hoping to partially salvage for my efoil build. It is reading 0 volts and would not charge for the prior owner. I am hoping to find some usable cells and just a dead BMS and/or a string or two of bad cells. Worst case scenario, if it is full of salt water inside I have a solid paper weight and might be able to reuse some parts for a new battery build. I have my battery welder at the ready if that’s the case. I have extensive exper…
---
### Author:  [@patfoil](https://foil.zone/u/patfoil)
#### Post date: [October 14, 2023, 7:37pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/11 "2023-10-14T19:37:54Z")
Thank you @ludwig_bre, this was super helpful, finally I understand more lol… looking forward to Part 2!! Could you please share the STLs for the 3d printed holders if you can? thanks again!
---
### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [October 17, 2023, 2:12pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/12 "2023-10-17T14:12:13Z")
Part 2:
Feel free to share your thoughts and what you would do differently 🙂
Sorry for the inconsistent use of “battery” and “cell”. Actually cell is the individual 18650 cell, battery would be a assembly of multiple cells.
[ ](https://www.youtube.com/watch?v=R1BiXBjgxn8)
3D Files of the holder I used:
[https://lbre.de/hp/fs/20S7P.rar](https://lbre.de/hp/fs/20S7P.rar)
---
### Author:  [@patfoil](https://foil.zone/u/patfoil)
#### Post date: [October 17, 2023, 2:21pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/13 "2023-10-17T14:21:00Z")
Thank you @ludwig_bre for the video and the STL files. Your instructional videos are awesome!!
---
### Author:  [@Sleekfoil](https://foil.zone/u/Sleekfoil)
#### Post date: [October 20, 2023, 5:04pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/14 "2023-10-20T17:04:56Z")
Excellent video, thank you
---
### Author:  [@SoEFoil](https://foil.zone/u/SoEFoil)
#### Post date: [October 21, 2023, 11:10am UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/15 "2023-10-21T11:10:06Z")
An excellent complement to your video is this 15 page detailed battery building guide '[Vincent's build - #60 by Vincentbraillard](https://foil.zone/t/vincents-build/2041/60) written by @Vincentbraillard
that is:
> [@Vincent's build](https://foil.zone/t/vincents-build/2041/60):
>
> Hello To help who don’t have skills with battery, I have made a instruction documentation with all the need link to build a 12s10p battery. Please it’s not a official document. Keep in mind battery are dangerous and I’m not responsable for any damage. ENJOY [Battery instruction by Vincent Braillard](https://drive.google.com/file/d/18ZmcA6llRjULramrTwpzx95nAUB91vqZ/view?usp=sharing)[STL files](https://drive.google.com/drive/folders/1UvcnQidLDy9uEY2g6muBOpi8VdhiNEVs?usp=sharing)
---
### Author:  [@Vincentbraillard](https://foil.zone/u/Vincentbraillard)
#### Post date: [October 22, 2023, 9:11pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/16 "2023-10-22T21:11:44Z")
ahahah thanks @SoEFoil
---
### Author:  [@Jokubelis](https://foil.zone/u/Jokubelis)
#### Post date: [April 22, 2024, 5:44pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/17 "2024-04-22T17:44:06Z")
Hello,
Thank you @ludwig_bre, great tutorial !
I am planning to build my 14S10P battery pack from 21700 cells.
Maybe you have made battery pack from 21700 cells with W pattern? 😃
It would be great if someone can share 3D file of holder, trying to draw frame for 3D printer with Fusion360 but it not easy program as paint…
---
### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [April 23, 2024, 7:32am UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/18 "2024-04-23T07:32:10Z")
Hey,
No, I have not done one yet for 21700 cells.
If you dont want to model a holder from scratch, check this SCAD-based parametric holder.
Basically just input the measurements into code, click “update preview” and then export as STL.
I recommend to set “slot\_height” to 0.
Make sure to print a small size/fit check first to ensure tolerances match
> **[GitHub - Addy771/Hex-Cell-Holder: An OpenSCAD project to generate models of...](https://github.com/Addy771/Hex-Cell-Holder)**
>
> An OpenSCAD project to generate models of hexagonal lithium cell holders - Addy771/Hex-Cell-Holder
Also make sure to read the console output, for non-symmetrical packs it will tell you to also export a mirrored version for the other side of the pack
---
### Author:  [@sat\_be](https://foil.zone/u/sat_be)
#### Post date: [April 23, 2024, 7:54am UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/19 "2024-04-23T07:54:50Z")
I used the ones from the link below, they are good quality and work well.
10Piece 10S2P 20X 21700 Battery Holder Bracket 21700 Spacer Assemble for 36V 48V Electric Bike or Escooter Batteries Use
[https://a.aliexpress.com/\_EjISESX](https://a.aliexpress.com/_EjISESX)
Matching 0.2mm nickel strips for this pattern are hard to source and expensive at the moment.
---
### Author:  [@Jokubelis](https://foil.zone/u/Jokubelis)
#### Post date: [April 24, 2024, 2:49pm UTC](https://foil.zone/t/efoil-battery-build-video-tutorial/18891/20 "2024-04-24T14:49:14Z")
Thank you for quick answers 🙂
Somehow managed to draw my pack holder from scratch using @ludwig_bre tips:
