# Diy battery 18650 pack or buy one?
**URL:** https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017
**Category:** Electronics (ESC, remote, batteries)
**Created:** [July 17, 2019, 6:31pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017 "2019-07-17T18:31:32Z")
**Posts on this page:** 20
**Page:** 2
### Author:  [@Shaun](https://foil.zone/u/Shaun)
#### Post date: [July 19, 2019, 8:48am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/21 "2019-07-19T08:48:12Z")
I’ve no experience of Sony cells, only Samsung 30Q. From what I’ve read they are a good cell.
Just make sure you buy from a reputable source to avoid buying fake/dodgy cells.
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### Author:  [@tinp123](https://foil.zone/u/tinp123)
#### Post date: [July 19, 2019, 8:53am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/22 "2019-07-19T08:53:34Z")
if you are 100% sure that they are original, go for it! it is a great price for a great cell
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [July 19, 2019, 8:53am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/23 "2019-07-19T08:53:35Z")
One of the batteries I built for a mate got a little water on the one side when his hatch leaked.
I was quite impressed to see that the batteries kept their voltage and didn’t discharge.
But it has lead me to start a hunt for a decent DIY waterproof solution that is not too bulky.
I might try vacuum form an abs enclosure or use polycarbonate sheets. Any other thoughts on solutions?
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### Author:  [@Nibbler](https://foil.zone/u/Nibbler)
#### Post date: [July 19, 2019, 9:10am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/24 "2019-07-19T09:10:01Z")
If you have no salt water the you won’t have a short circuit when water is around the contacts or battery’s. I measured a resistance of 500kohm for 5mm water. So the current will be very very very low. Pls correct me if I’m wrong.
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### Author:  [@Rienk](https://foil.zone/u/Rienk)
#### Post date: [July 19, 2019, 11:05am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/25 "2019-07-19T11:05:34Z")
I have used the sony vtc6 and I think it is better then the 30q because of the higher discharge, so you lose less power to heat.
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### Author:  [@Felixfoiler](https://foil.zone/u/Felixfoiler)
#### Post date: [July 19, 2019, 11:30am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/26 "2019-07-19T11:30:24Z")
Ok thanks and they cost me 3,8 so I still think it’s a good price and I will ask him if they are 100% not fake. But thanks and waterproofing the battery is the next step. A waterproof box?
Any suggestions?
Felix
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### Author:  [@tinp123](https://foil.zone/u/tinp123)
#### Post date: [July 19, 2019, 12:07pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/27 "2019-07-19T12:07:56Z")
30Q you can get for 2,99 eur.
if you go with 7p or less, vtc6 will be better choice. for bigger batteries, like 8+ parallel cells, 30Q is better choice because of price.
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### Author:  [@Felixfoiler](https://foil.zone/u/Felixfoiler)
#### Post date: [July 19, 2019, 1:17pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/28 "2019-07-19T13:17:07Z")
Thanks i will go dir 14s 7p
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### Author:  [@Toto44](https://foil.zone/u/Toto44)
#### Post date: [July 19, 2019, 1:39pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/29 "2019-07-19T13:39:18Z")
This is 21 Ah i think it will give you Max 20-25 minutes ridetime
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### Author:  [@Felixfoiler](https://foil.zone/u/Felixfoiler)
#### Post date: [July 19, 2019, 2:25pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/30 "2019-07-19T14:25:04Z")
It’s ok I just don’t want a 20kg battery and it should be under 500€ and the lift foil goes with 2kwh 2h (drove it 2 weeks ago was so cool)
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [July 19, 2019, 3:27pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/31 "2019-07-19T15:27:06Z")
The Lift e-foil has a 14S14P battery with Samsung 30Q cells. That’s 42000Ah.
If you want to go slightly smaller, go 14S10P.
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### Author:  [@MikeL](https://foil.zone/u/MikeL)
#### Post date: [July 19, 2019, 4:04pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/32 "2019-07-19T16:04:16Z")
[http://e-greenmotion.com/index.php?route=product/product&product\_id=269](http://e-greenmotion.com/index.php?route=product/product&product_id=269)
this might work for some
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### Author:  [@Felixfoiler](https://foil.zone/u/Felixfoiler)
#### Post date: [July 19, 2019, 5:01pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/33 "2019-07-19T17:01:17Z")
Really I read 2kwh on It ok but thanks
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### Author:  [@tinp123](https://foil.zone/u/tinp123)
#### Post date: [July 19, 2019, 5:22pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/34 "2019-07-19T17:22:14Z")
Cont discharge 50 amps only…
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### Author:  [@Buildshit\_gijs](https://foil.zone/u/Buildshit_gijs)
#### Post date: [July 19, 2019, 11:07pm UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/35 "2019-07-19T23:07:56Z")
hey,
500 is quite a tight budget, don’t forget the price of the charger and bms
my battery is 700 euros (16S10P) excluding buying a spot welder
. btw don’t cheap out on testing and isolation, I see a lot of guys not using cell isolator rings with a bit of heat the stock isolator that’s on the cell will melt a way, for like 3 euros u can get 200 isolator rings (these will help to prolong the lifetime of your battery by a lot!)
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### Author:  [@Felixfoiler](https://foil.zone/u/Felixfoiler)
#### Post date: [July 20, 2019, 3:44am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/36 "2019-07-20T03:44:13Z")
Thanks can you tell me which spotwelder heatschrink ni strip and cells you are using.
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### Author:  [@Buildshit\_gijs](https://foil.zone/u/Buildshit_gijs)
#### Post date: [July 20, 2019, 8:30am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/37 "2019-07-20T08:30:25Z")
Vtc6 cells and 10mm×0.15 nilkelstrip, 3 layers
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### Author:  [@tinp123](https://foil.zone/u/tinp123)
#### Post date: [July 20, 2019, 9:10am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/38 "2019-07-20T09:10:26Z")
Where will you put 3 layers? On series connection? That is way too weak, it will be enough for only 35-40 amp cont. On parallel connection? That is overkill, current between parallel cells is minimal. What I want to say, number of layers depends only about design of your battery.
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### Author:  [@Felixfoiler](https://foil.zone/u/Felixfoiler)
#### Post date: [July 20, 2019, 9:11am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/39 "2019-07-20T09:11:58Z")
Can you make me a battery plan for 14s7p that I don’t melt the ni strips?
Thanks
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### Author:  [@tinp123](https://foil.zone/u/tinp123)
#### Post date: [July 20, 2019, 9:16am UTC](https://foil.zone/t/diy-battery-18650-pack-or-buy-one/5017/40 "2019-07-20T09:16:45Z")
Do you have any specific box where you want to put your battery? Or any other dimensional restrictions?
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