How to make your own 4s 18650 Lithium-Ion battery pack.

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This is how I built a 4s 18650 Lithium-Ion pack for my 4" long range quads
I know this isn't the perfect way to build a battery pack but this gets the job done and is safe enough for what we do with these quads.
List of the parts I used (and some that I didn't):
Molicell p26a bit.ly/3qdw9Em
Xt30 amzn.to/3kKbtCP
4s balance lead amzn.to/3uPbWsb
Heat shrink 85mm amzn.to/3qdOEZb
Nickle strip 0.2mm amzn.to/2NKGvi1
Kapton Tape 5.89 amzn.to/3q7Pu9Z
Fish tape rings amzn.to/3kBtovo
Spot welder amzn.to/3bSM85N
If you just wanted to purchase a pre-built 18650 pack you can get one here at RDQ: bit.ly/2NMjHhX
If you really want to support me, head over to my web page www.tweetfpv.com to see all the ways you can support me and my work in the FPV community.
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Tools:
Wera Kraftform Plus 354 Hex-Plus 2.5mm Hexagon Professional Screwdriver: amzn.to/2Wd6K1z
Wera Kraftform Plus 354 Hex-Plus 2mm Hexagon Professional Screwdriver: amzn.to/38MN0Xz
Wera Screwdriver Hex-Plus, 1.5 mm x 60 mm: amzn.to/2Cu9LDn
Pocket Multimeter: amzn.to/3elmd5Q
RDQ prop Tool: www.racedayquads.com/products...
TS80: amzn.to/3gPsnwz
X-acto knife: amzn.to/2OhG3Ep
Soldering tweezers: amzn.to/326ujNe
Filming:
Sony A5100: amzn.to/38Pme0L
Comica boomxd wireless mic: amzn.to/3gQB1uV
Joby Gorilla pod: amzn.to/3eiz0pt
Ethix SD card holder: newbeedrone.com/products/ethi...
Microsoft PL2 ARC Touch Mouse: shorturl.at/bm137
Quads and quad parts:
APEX HD frame: www.getfpv.com/impulserc-apex...
Ethix S3 Props: www.getfpv.com/ethix-s3-water...
Five33 Tinytrainer: flyfive33.com/product/tinytra...
DJI FPV system: www.banggood.com/custlink/GGG...
Eachine FPV Watch monitor: www.banggood.com/custlink/mK3...
HOTA D6 Pro: www.banggood.com/custlink/DGK...
Betafpv 65x HD: amzn.to/2ZZSDOf
happymodel mobula6 25,000KV: www.banggood.com/custlink/D3m...
TBS Tango2 Pro: www.getfpv.com/tbs-tango-2-pr...
Betafpv BT23.0 charger: amzn.to/3iPKEvP
Strix PH2.0 charger: amzn.to/2BSxvl1
Lumenier Axii Long Range antenna: amzn.to/38V6t8E
Ethix Liop bag: www.getfpv.com/ethix-heated-d...
DJI PFV goggle analog adapter face plate: www.ebay.com/itm/Faceplate-fo...
ISDT BG-8S lipo checker: www.banggood.com/custlink/vGK...
Earth bound entertainment:
ODROID-GO Advance Black Edition Aura Black: www.hardkernel.com/shop/odroi...
RK2020: rkconsole.com/products/rk2020...
These videos take a lot of time shooting and editing. If you like my content, please like and subscribe. Leave a comment if you have any questions. Thanks for watchin'!
Thank you and keep flying!
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TOC:
intro 00:00
supplies 02:00
How to pick a cell 06:30
What does a bad cell smell like 10:10
Pack layout 10:40
Start building 13:50
How to solder a cell 16:50
How to weld a cell 19:20
Wiring the pack 25:30
Making it safe 30:30
Final thoughts 32:45

Опубликовано:

15 июн 2024

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Комментарии : 119

@NikosGR_ 28 дней назад

Today I made my first 4s 21700 ion pack. Some tips for beginners to avoid mistakes: always double check every connection you make, read and understand the wiring diagram of your pack first! Good luck! Spot welder recommended.

@Spinal1515 5 месяцев назад

Finally someone who stresses to not solder lion. Well done !

@PolyFPV 3 года назад

Thanks for this, I have a ton of 18650s laying around and have been toying around with the idea of making one of these.

@TweetFPV 3 года назад

Go for it!

@russsmith9042 3 года назад

Nicely done my friend no BS about it that was pretty cool thanks

@Alohakoa59 2 года назад

Thanks! Been wanting to try one of these

@johnk8825 3 года назад

That looks like fun I guess because I like doing things like that. My problem, have no use for any right now, but thanks Dan I feel smarter now.

@bobbysparling9581 Месяц назад

You could also weld the nickel strips to the battery and then solder to the nickel strips

@snppls 2 года назад

Thanks for this. I’m trying to build a 4s 18650 Li-ion battery pack for a PAPR fan unit. The real deal costs $1000 which is why I’m going DIY. Your video is very helpful

@TweetFPV 2 года назад

Glad I could help

@maxfliesdrones1613 2 года назад

This is quality content, it's organized well with chapters, easy to understand, and enjoyable to watch. Great job. 👍

@TweetFPV 2 года назад

Much appreciated!

@Mupshot 2 года назад

you have a voice for radio. Nice presentation

@TweetFPV 2 года назад

Thank you!

@sonofabiker7283 3 года назад

Thank you! thank you!

@TweetFPV 3 года назад

You're welcome!

@LoneStarUAV 3 года назад

I've been building 3S Li-ion packs out of Sony VTC6 cells, they work very well with the Explorer. Yes, you have a slight performance loss due to it being a 3S pack, but flight time remains the same. I buy them for $5.99 a piece.

@trailwisataexplore812 5 месяцев назад

Dapat berpa menit dengan 3s

@brandohim 3 года назад

I just received the 21700 4s from Fpvcycle and I flew my Shendrones squirt 2203 3450kv for 13min with a gopro and the voltage at landing was around 3.2 per cell. I was freaking shocked.

@TweetFPV 3 года назад

Dang. 21700s are probably a better choice if you can swing the extra weight and size.

@KernsJW 3 года назад

Just saw this video. Bought some molicels myself last week. Bought fish paper along with and a mid range low end spot welder. That kweld was just too expensive. Went with .20 8mm pure nickel strips. Hope mine turn out well too! I have all the balance leads and wire I think I will need. I am looking to build 3s and 4s cells. I went with 85mm pvc heat shrink for 3s and 120mm for 4s. Guess we shall see how that works out

@TweetFPV 3 года назад

Figuring out the right size heat shrink was the hardest part for me. Needless to day I have a lot of extra heat shrink laying around now! I agree on the kweld. The only reason I have one is someone was selling the kit unassembled for a crasy low price and I was able to swoop in and scoop it up!

@alsvideos4110 2 года назад

I would love to see how you go at charging it? and how to use the right charger.

@andytaylor3321 2 года назад

the zhod 4s1p cost me 70 canadian but its pretty great on the explorer thanks tweet

@Gavs_rc_hobbies Год назад

This reminds me of the days when i used to make my own 6 cell NiMh packs for my rc cars, only that this is a bit more dangerous with the lithium cells.

@TweetFPV Год назад

Yea, when things go wrong it gets interesting fast!

@chiraggoyal7637 Год назад

Did you test flight? I can't seem to find such video on your channel

@fabian9163 3 года назад

Great video! Any experience on the thickness of the welding-stripes? Only have a cheap welder which can only go to max 0.15mm. Will 0.15x7mm be enough to drive ~8-12 amps?

@TweetFPV 3 года назад

You can double up possibly. With this 4"lr you won't be pulling too many amps. You will probably be fine with. 15 strips but I would fly and then check the temp of the strips.

@MrNams 3 года назад

@@TweetFPV Will these Li-Ion cell work for my below hex? 1)Frame:Tarot 680 PRO Folding Hexacopter Frame 2)Motors:6x Tarot 4108 High Power Brushless Motor (380kv) 3)Propeller:3x Tarot 1355 Carbon Propellers (Two Holes / CW and CCW) 4)ESC (Electronic Speed Controls):6x Hobbywing XRotor 40A-OPTO ESC

@TweetFPV 3 года назад

Depends on what your desired input voltage is for

@MrNams 3 года назад

@@TweetFPV i m more concern about current drawn from battery

@TweetFPV 3 года назад

I would stick with lipo for your build.

@tech518b9 3 года назад

30Q and VTC 6 have Petty much the same discharge. The 30Qs 15A are continuous and the vtc 6s 30A are burst only. Realistically they both can deliver 20A continuous on drones. The best cell however is the P42A since they have even better power to weight than all the 18650.

@TweetFPV 3 года назад

Yea but the p42a are 21700 cells.

@divingfalconfpv4602 3 года назад

VT6 said continuous online 30a.. they just recommend temperature protection if using at that amount.. doubt any of us using 30a continously.. I'm at like 10a lol 30Q is 15a continuously I do want to try build a P42 pack. That be nice. 50% heavier but worth it.. than going 6s2p or 4s2p

@tech518b9 3 года назад

@@TweetFPV yes 21700 cells scale a little bit better compared to 18650. For lighter drones you should go down to 2s or 3s with them but for bigger ones 6s1p or 4s2p is great.

@steveeb00 2 года назад

You made my Google Hub answer.... and it gave me the answer before yours. LOL!

@TweetFPV 2 года назад

yea my internet sucks!

@divingfalconfpv4602 3 года назад

Thinking 21700 4000mah 35a .. 6S might weight 475g .. thin kthey have higher mah if I search harder

@TweetFPV 3 года назад

21700 is a cell that I want to try for my next pack.

@ZorgFS 2 года назад

Very nice show, thank you. Currently, I'm also getting a background on properly building packs myself, as it's not readily available in my area and ordering is a headache with land\sea delivery more than a month waiting times.. My concern is nickel strip you've used - matching standard is SSPN-0013 if that's pure nickel (0.2x8mm). Now this strip have max 9-12Amps rating for a single layer. If you want like 30th Amps currents you'll need at least 3 layers, which is still fine and acceptable, just need to weld 3 strips for each bridge on top of each other... But my concern is overheating - we all know how much current 4S quad could theoretically draw on freestyle active flying. For example, testing single 0.1 by 4mm strip with 15A current it'll heat up to +55C, at 30A it's about +500C (Nickel melting point is 1455C or 2651F and for 0.2by8mm strip it will be a bit different) as for the batteries - they normally take up to +60C temp (charging, rapid discharging as per specs sheets) - obviously depending on the battery model. Second point - voltage sag for Li-Ion - for example top quality packs on MOLICEL P26A cells as you mentioned could theoretically provide up to 35A, but as per testing it will immediately sag to 3.43V during such current draw... which suxx... Any ideas on that?

@TweetFPV 2 года назад

Ideally stacking or using thicker strips would be ideal but the application we use li-ion packs for a typically low amp draw. That's why you only really see them used in either very high voltage applications (ohms law volts go up current goes down) or low amps applications.

@ZorgFS 2 года назад

@@TweetFPV Sir don't get me wrong! I'm not here just to argue or something! :) Just wanted to clarify for myself...I'm also now planning to switch to Li-Ion and wanna be on a safe side... regarding the current - if you have time\desire check CJ Davies - Flying my home-made 4S Li-Ion batteries // Samsung 30T 21700 Apr 24, 2021 in youtube - guy shows his full OSD stats at the end after old lady style first test flight on his 4S Li-Ion pack and the max current was 50Amps... again - no freestyle whatsoever... So, I wonder, if even 2 strips are enough in terms of safety... as he used single 0.2 by 0.8mm, which is rated for 9-12 Amps and that is STILL not enough

@TweetFPV 2 года назад

I would think there is a time/current/distance factor for the strips. But when in doubt stack em up. I honestly don't know. Might make a good video to pull my pack apart and the auline that I have to compare the construction.

@TweetFPV 2 года назад

I'm also running a xt30 on it which is only rated at 30amp. But i know it will carry more than 30 amps.

@ZorgFS 2 года назад

@@TweetFPV That is actually very good idea, interesting what is behind their shrink warp... and you may do that in non destructive way either, I believe... I mean your method is more than adequate, at least for me being a noob in lipo\li-ion packs... actually... now that I've mentioned that... I've been using all possible Li-Ion packs for several years as a vaper :) and back then we've used as much amperage as possible from a cell due to very low resistance coils, so yeah! :) that's why this topic is interesting :)

@babenane1 2 года назад

Can you build a Halo pro drone's battery for me? I'll send you the battery so that you may use the correct dimensions.

@KCQuadTronX Год назад

i NEED TO GET YOU TO MAKE ME A 6SVERSION FOR MY 6S QUAD ....OMG THAT WOULD BE AMAZING

@TweetFPV Год назад

Save you some time. www.racedayquads.com/products/auline-22-2v-6s-3000mah-10c-li-ion-battery-xt60/?aff=52

@pampfpv 3 года назад

Newbie question. If my battery has current discharge of 5a, making a 4s pack i have a total of 20a current discharge? do they stack? ty

@TweetFPV 3 года назад

No, when you make a series pack (which is what you are doing) you get the same amp rating but you increse the voltage. So you pack will only be 5a. When you wire in parallel you add to the capasity and discharge rating. But your voltage stays the same.

@VintageCR 6 месяцев назад

is it considered a 2s if you 'extend' a 2s pack with another 2s pack? (all same batteries)

@TweetFPV 6 месяцев назад

Depends on what you mean. 2s is 2 cells in series. If there are 4 cells but 2 are in series and 2 are in parallel then it's 2s2p

@Jacey2001 2 года назад

I have a very new rigid tool battery that has one bad cell. I might make one from those

@TweetFPV 2 года назад

Those probably aren't high discharge cell and would Make for a weak pack for flight.

@Jacey2001 2 года назад

@@TweetFPV ok, they are Samsung 18650s

@TweetFPV 2 года назад

Depending on the spec then those might be alright.

@Jacey2001 2 года назад

@@TweetFPV just going to buy new ones. These have been drained to far. Revived batts won't be optimal.

@petrfux 2 года назад

Made my day at 15:35

@dmhans22 3 года назад

What spot welder did you use?

@TweetFPV 3 года назад

Kweld

@jayb6180 3 года назад

can i try makin this same on 10A rated 18650 cell, like 1s 18650 10A x4 = is it good or amp is little lower?

@TweetFPV 3 года назад

I would get the highest amp 18650 cells you can find. Four 10amp cells wired in series is still 10amps of avalible current.

@jayb6180 3 года назад

@@TweetFPV THANK U SIR UR REPLY MATTERS ALOT. u saved my R & D costs.

@jayb6180 3 года назад

@@TweetFPV love from INDIA.

@user-uh9mc7xb8t 2 года назад

Hi~ Let me ask you a question. It's a 3 inch cine hoop. In the video, there are videos of making a pack with 4 lithium-ion 18650 batteries and flying it with an FPV long range. With excitement, I ordered batteries and made a pack. LGDBHG21865 3000mA. The problem is... When I hovered, the yaw tick symptom reappeared after it came up, and, after a few seconds, the low-voltage buzzer sounded and the aircraft sank. If I open it again, it opens again,,,,, repeat... So, I changed the low voltage warning in Beta Flight to 2.7V, and when I turned it on, there was no sound. If I take a break for a while, it will float again. But it sinks again... The battery is hot, and the voltage is 3.8V... TT I bought 40 tablets... but I can't use them all? How do people use? Batteries were also made by buying anything. Is my FC the problem? Or is there a special setting for Li-ion? FC is IFlight SucceX Mini F4 V3 Stack, and the manual says 2~6 Lipol. Do I have to use only Lipol? Can I change FC? Why is this happening? It's a waste of money/work time. I'm serious~~ Please advise.~~ TT

@TweetFPV 2 года назад

Those cells are very heave and don't offer much discharge rate. They are probably too heavy for your cinewhoop. Li-ion packs are usually used on very efficient crafts with 4inch to 6inch bi-blades. Cinewhoop a are very ineffecient and require very high discharge packs that's why lipo packs are used. Try using a 850mah lipo from a reputable manufacturer.

@user-uh9mc7xb8t 2 года назад

@@TweetFPV 3-inch cinehoof, weighing 350g. The motor is 1408 3600KV. Is there absolutely no way with my drone? What if I reduce the weight or change the motor to a lower KV? If you change it, how many KV and how many grams is appropriate? I've bought too many 18650s... I'm desperate.

@TweetFPV 2 года назад

18650 on a cinewhoop is the wrong use for them. Try a lipo.

@user-uh9mc7xb8t 2 года назад

@@TweetFPV Thank you very much~

@badkarma2202 2 года назад

What size heat shrink was the correct size?

@TweetFPV 2 года назад

Links in the video description, 85mm amzn.to/3pRBeWz

@lastick56 Год назад

What size was the heat shrink warp

@TweetFPV Год назад

amzn.to/3z7E5y3

@abin3475 2 года назад

which better with cable and solder than nickel?

@TweetFPV 2 года назад

Spot Weld is better

@abin3475 2 года назад

@@TweetFPV how about the thickness for 4-6s?? 0.1mm/0.15mm

@bdee1084 7 месяцев назад

Do these cells have safety chips

@TweetFPV 7 месяцев назад

@bdee1084 7 месяцев назад

What pcb would you recommend for something like this? Need short protection with over charge and discharge protection. I’m wiring in a pack and need to protect the supply itself and the tools. Thanks!

@TweetFPV 7 месяцев назад

@@bdee1084 I would just look around on aliexpress for a bms board is the right cell count for your application.

@sweetcollegegirl960 3 года назад

Hi bro I have a quadcopter f450 with 920kv motor and 30a esc 1045 propeller apm2. 8 and now I using 11.1v 2200mah battery gives me a flight time of 5 min I want to use these li ion cells can u pls help me which cells should I use and in which configuration pls help me out bro Thanks for reading

@TweetFPV 3 года назад

Bro, what is the max voltage your electronics can handle bro?

@sweetcollegegirl960 3 года назад

@@TweetFPV my esc up to 4s

@sweetcollegegirl960 3 года назад

@@TweetFPV 4 cell battery

@TweetFPV 3 года назад

I recommend using the Sony Vtc6 or the molicel p26a in a 4s1p or 2p configuration depending on how much weight your willing to carry and how large of a pack you can carry.

@sweetcollegegirl960 3 года назад

@@TweetFPV bro reply

@chrisalexthomas 9 месяцев назад

Whats fish tape?? Or did I mishear what you actually said?

@TweetFPV 9 месяцев назад

I probably meant to say fish paper but it's the thick cardboard type paper that separates the cells from rubbing on each other and then the other one is kapton tape I might have mixed the two up

@chrisalexthomas 9 месяцев назад

@@TweetFPV ohhhhhhh that’s useful to know, thanks

@trailwisataexplore812 5 месяцев назад

Aq rakit 3s buat drone aerial dapat 10menitan

@czaro8006 4 месяца назад

So there is no BMS??

@TweetFPV 4 месяца назад

@czaro8006 4 месяца назад

So would I be safe to fly such pack If I could charge all 4 Li Ions in let's say Lii 500 Liitokala?@@TweetFPV

@TweetFPV 4 месяца назад

@@czaro8006 the way this pack is built it isn't intended to be charged In a charger like that after its assembled. This configuration is intended to be charged In a rc hobby charger like this amzn.to/3HHLvwb

@HindsightFPV 3 года назад

Sounds like you've been watching AvE.

@TweetFPV 3 года назад

Just a little 😂

@LalapopApple 3 года назад

dont solder this... yeah u, dont solder this.... alright now im gona show u how to solder this... :D

@TweetFPV 3 года назад

😂

@marceldavis3628 3 года назад

26000? More like 2600

@dauntlessfpv 3 года назад

Don't solder these. (has good spot welder). "oK lets solder them!

@TweetFPV 3 года назад

Expectations vs reality 😂

@dauntlessfpv 3 года назад

Haha

@apollyon7573 3 года назад

Me? I'll soldered them.

@tech518b9 3 года назад

Its not very smart to directly glue them together without additional insulation. the cell wrapping can get damaged very easily and then you have shorted cells.

@timsanders7632 3 года назад

Eh this hobby is all about risks.. hot glueing these together is still much safer and stable than a high c lipo we are use to strapping to the drone.. #sendit

@TweetFPV 3 года назад

With the covering on the 18650, the hot glue holding them in place, the kapton tape, and external shrink tube I'm not worried at all about the cells shorting. The ONLY place I am concerned about the cells shoring is at the positive pole. That is why I always use the fish paper insulating rings.

@tech518b9 3 года назад

@@timsanders7632 I have build many li ion packs. Everything from drones to e bikes to solar battery's and I have also seen burned down battery's from Friends. Its very important to insulate the cells in series. Maybe they don't burn after the crash but later in your house. Im sorry but #sendit is a very bad idea when it comes to battery safety.

@aerialcombat 3 года назад

@@tech518b9 how would you recommend protecting them?

@tech518b9 3 года назад

@@aerialcombat There are several different methods. The easiest is fish paper or other abrasive resistant material. You can also buy plastic spacers or even 3d print with filament that can take some heat. At least put some double sided tape in between if you don't have any of the above.