How to Make a 50,000 mAh Power Bank from Scrap Laptop Battery 

You have made a 3s7p battery. This supplies 3.6v (nominal) x 3 = 10.8v, with only 2000mAH (nominal) x 7 = 14,000mAH worth of current. You would need to have all the batteries in parallel (1s21p) to get near the 50,000mAH you stated (although it would only be 46,200mAH). If you look up 3s7p li-ion packs online you'll find them listed as 12v 14/18/20AH depending on the individual cell mAH capacity.

This music makes me want to break things

*has a seizure at the immense disgust of this video* A couple things to say: For starters, this is NOT a 50000mAh battery. You rounded from the actual value of 21 x 2200 which gives 46200mAh on USED cells is completely wrong to round up this much. Even if they were brand new cells, I’d still be looking at this abomination of a calculation in disgrace. Now with only 6 of the cells being ICRI 8650-22FUs, which have a capacity of 2200mAh, over time of constant usage, they are definitely not going to be 2200mAh. You would be looking at 1500mAh at a push, considering that laptop batteries would have had a constant load on the cells and would have easily cycled the batteries from discharge to charge around 500 times. This is backed up by datasheet of these batteries at Spec No. 7.8 - Cycle Life, where it states that after 299 cycles of the battery, the capacity is estimated to be less than or equal to 1505mAh. So, given this, we are already talking about 31605mAh battery at a maximum which is probably the 98th percentile of the capacity of the cell. So, I feel like I’m right in saying that the total capacity of the array is about 30000mAh, not 50000, but this is going by your ludicrous and idiotic logic of calculating the capacity of an array of cells. which isn’t correct at all and is in fact less than 10000mAh. Next let’s talk about battery wiring configurations. There are two ways to wire a battery. Series and Parallel. With series, you are increasing the output voltage and keeping the capacity value at a nominal value. Series is wired from Positive to Negative (+ to -). With parallel, you are increasing the total cell array capacity, and keeping the voltage nominal. Parallel is wired from Positives to Positives and Negatives to Negatives. (+ to + and - to -). 18650 cells are made in a way where the top is identified by a ridge in the side of the cell around the lip of the top of the cell and a coloured paper ring (easily differentiated to the shrink wrap of the cell). if you take 7 AAA batteries and put the positives in line and the negatives in line, you end up with a battery which has a large capacity but no increase in voltage. This is kind of what a D cell battery or C cell battery is. A larger capacity cell, not an increased voltage... In the instance of the 18650s, you are looking at the 7 cells having a total capacitance much less than 10000mAh. Imagine taking 3 D cells rated at 1.5 volts each and putting the positive end to the negative end 3 times. You are not going to get an increase in capacity whatsoever, but rather a voltage of 4.5V. Now, take the battery made in this video, and you are not getting anywhere neat to the proposed capacity the title suggests. You are talking about 5 times less than what the title says. I don’t know how you have a square root symbol in your channel banner but can’t even calculate how batteries add up… Next, lets talk about your soldering. My seizure was mainly at this. I understand that you target your videos at a demographic who enjoy seeing ‘life hacks’ and cheaply making a product which would normally be expensive. However, this doesn’t excuse the fact that you can’t use tabbing wire. The copper wire you use is probably from a pair of headphones. Its so thin that it would struggle to handle the current of the wire and it would heat up. When you opened those laptop batteries, did you see any of that disgusting wire you used in there? No. They used tabbing wire which is a much safer and neater alternative. Not only that, but it reduces the chances of that battery pack becoming a bomb. I would expect a you tuber with a large following such as you to at least be able to learn how to solder properly. You should be presenting your videos so that people who a video titled with ‘How to make…’ don’t end up replicating your disgusting soldering. At least learn standard safety procedures. People who fall for your clickbait titles which make me revolt will clearly not know to safely perform the activities you show in your video. You really should change how you present yourself on RU-vid to your audience or one day someone is going to get seriously injured trying to replicate what your doing here.

You should always have batteries that are the same capacity and preferably the same type with each other. To have the same voltage on all of them you have to charge them all to 4.2V and then only you should wire them together

occasionally clean the tip of the soldering iron, use a sponge not too wet but not too dry, and use the flux because on the circuit, the tin does not apply well.

Nice idea, but some very serious design flaws: 1) You just measured the voltage of the batteries and went from there. This is not a good idea when dealing with used lithium cells from laptop battery packs (or similar). The batteries must be capacity tested using a balance charger (like an Imax B6 or Turnigy Accucel). 2) When connecting batteries in series, they need to all be at the same voltage level, otherwise they will charge/discharge into each other. Make sure that all cells are at the same voltage before connecting in series, and try to put batteries of similar capacity together so that one weak cell doesn't down the entire pack. 3) This battery pack is not a 50,000mAh battery pack. You have to take the voltage of the entire pack and use the capacity of the cells that are in parallel with each other. For example, this is a 3S7P pack, meaning 3 cells in series and 7 in parallel. At 2.2Ah per cell, this is 15.4Ah or 15,400mAh at 11.1V. 4) The output of the pack is at 5V so to get the capacity at the output, you have to firstly calculate the Wh of the pack (15.4 * 11.1 = 170.94Wh) and then divide by the output voltage. So at 5V, it is just over 34Ah, minus any losses in the converters/regulators etc. 5) The soldering is very weak, and you'll likely get dry joints. You need to make sure that you use solder with flux/rosin built into it. Otherwise, you need to add additional flux/rosin when soldering. Overall, good concept, but there are plenty of improvements that need to be made.

Your videos are really different from everyone, I love learning that much. I want more videos with you. (Thanks)

Thats soooo amazing set up.Great video!!!!!!

Good tips, not complaining about the soldiering, it depends on who make the project. Good job for the great tips 😊

1. Soldering to the battery case is not too smart, it's do-able; but if you pulled them from laptops: leave the metal tangs on them as they are a better soldering point. 2. 7 batteries in parallel is only 16.8 Ah or so. 3 of these in series gives a ~11V nominal battery. Series charging of lithiums is a pain... 3. Even if all cells were parallel (which would be ideal for charging etc.) the batteries would give ~50Ah, buut these are pulls from laptops; therefore expect a diminished capacity so ~30Ah is the best achieved. 4. [which really pertains to 2.] Each of those parallel banks has a _different capacity_ therefore when put in series there will be a weak set that will drain long before the others do; these cells need to be tested, measured and matched to achieve a safe and reliable pack. 5. The misinformation caused by stating 50'000mAh in title and thumbnail does in fact give cause to flag this as clickbait... Come on, stating that used batteries give full as-new capacity, AND stating a parallel capacity (rather than the pitiful 10 amp-hours available from this jabbed-together recycled SERIES-PARALLEL pack) AAND the lack of testing of the batteries is really ticking off my inner engineer - especially since 370K people have seen this D: Not only that but stating the capacity as thousands of milli-amp hours is the same as stating a price of "$9.99". Does it hurt to just state the Amp-hours as they are without adding the trailing zeroes? (Stating in milli-amperes per hour is usually only done for a single-cell...) Just think before doing something, this could have been a cool tut, but instead it's clickbaitey and there's no voice from the author, just over the top music that i may or may not like. An explanation really boosts the quality from a viewer's point of view. Oh and work on that soldering! It's pitiful at best!!! A tip for sexy-soldering: visualize the heat, get everything you wish to solder up to the same temperature; test the heat by prodding these areas with the solder; it should flow quickly, not slowly globbing about. But be careful not to overheat what your'e soldering; which in this case is the *bare-ass of a lithium cell!!!* Which brings me back to 1. Soldering to the battery case is not too smart, it's do-able; but if you pulled them from laptops: leave the metal tangs on them... 2. .... 3. ... and so on in an endless loop of doom...

Great Job. You Just Built A Bomb With The Explosion Of 8 Early Released Note 7s.

Hey thanks for the video tutorial...it was fun watching you put this together.

Batteries are usually spot welded. But you can get away with soldering but... Soldering iron must be real hot and you must use flux so you can use as little amount of time as possible to avoid damaging the cell. Also your wires are just too thin. They increase internal resistance of the battery. Also if each cell has 2 000mAh at 3.7V then your whole battery has 7 batteries in paralel x 2 000mAh per battery at 3.7V that is 14 000 mAh at 11.1V because you have 3 banks in series wich increases your voltage but not your capacity. Wich is another think to consider. Why use so high voltage and then step it down quite a bit? There are regulators which can operate at nominal voltages of the lithium cells and even charge them (no need for BMS board = saved money). Also DC to DC operate at around 80% to 90% efeciancy. Better to loose 20% from 3.7V then 20% from 11.1V. One more thing. I would not trust that BMS board to limit the charging current. Get some proper charger to do that (or use dedicated power bank board that can handle that as well as steping the voltage up / down for that USB, as i wrote earlier)

Never ever take this on a plane flight with you!

thanks from Colombia amazing ingeniering

Use new LiFePo4 batteries of the same type and put them all in parallel. Then use a 2A boost converter to go from 3.3V to 5V. Balancing circuit not required. Use a small solid wire rated at 5A. If the battery is ever shorted the small wire will burn out acting like a fuse.

clean your soldering iron tip and use flux pls

those are some cold joints.

厲害，行動電源製作方法，好棒喔！😄👍👍👍👏👏👏

Someone is gonna blow themselves up after watching this.

amazing scale!

The wire you soldered ,is for shure not enough for such a current

Well it work. I strongly disagree on using used batteries. Good video. Great effort.

very interesting. thanx for this video. only one question. are there are casing to be found? if I had this piece of brilliant battery I would prefer a nice and safe case to put it in. any ideas?

Why would you use a 3S pack to get 5V output? It would make so much more sense and simplicity to have a 1S pack and use an off the shelf buck-boost converter designed to run a phone charger controller PLUS you wouldn't need a proprietary charging adapter, you could charge it with a USB cable.

Throw it on railway station and run, Guaranteed meeting with Cops ...lol

No2 cũng chuyên chế pim dự phòng khủng, nhưng thực sự chưa chế em nào lên tới 50000mad cả, cảm ơn video của bạn

love the dry joint's, and the extra light wire used to link um lol ;)

Thats 12v configuration 2200 x 7 15,400 only series plus voltage an paralel plus amps and with 3a module is faster

Nice project. Highly recommend using thicker wires to keep cells balanced.

Not bad for about a 10-15,000 Mah DIY battery, problem being the cells are all in varying degrees of use " eg some are going to be half worn out, others are going to be considerably more of considerably less, that alone will quickly cause problems.. Many other variables to consider as well. At best an interesting short term power bank that'll last for a dozen or so charges and appear to work ok, after that you'll start running into problems

In 1 hour it went up from 10.9 to 11.8 or 11.9 with the all that flickering! Nice!!

got to be the most crappy Soldering job ever

6:19 bomb is planted.

voces sao incriveis! me dao cada ideia

i need this for emergency lamp

You are very creative bro.... Love it

It can't be 50000 mAh and 10 Volts. It maximum can be 15400 Mah.

A Genuine Video, m using exactly the same thing at home

Which module you have used in the circuit for charging and displaying

Fire hasard, pure...

you like make BoOM good job :)

If you do not measure the capacity of the batteries, it makes sense to connect the same types in series.

Que bien, saludos desde Colombia....

Protection on the plane said it was a bomb :(

You should work on your soldering skill a bit. Also the main concern for recycled cells is balancing. With 7 cells of unknown condition connected in parallel, you have no control over their charging.

Excellent video. Greetings from Venezuela.

Show me this place had old pin please , thank you ,,,

Terrible soldering. You should place a solder tip to pad and wait to good solder melting, or set soldering iron to higher temperature, or change the solder. These connections look like bird pecking

UGH!! That soldering job hurts my eyeballs to look at it.

Is that wire heavy enough for the current ?

Theo dõi lâu rồi mà giờ mới để ý đây là channel của người VN 🤣

The gauge of wire and soldering job on this have me cringing SO HARD. But to be fair, it is a cool concept video.

the scissors he used to clip the wires :D cowboy all the way

Superb I m going try this at home thanks for making this video

X-Creation tanks 4 d video once more, I made this power bank, but I discover dat d powerbank takes 3 to 4days to full charge after discharge wen using it. Why is it so?

This is absolutely going to blow up if used for longer periods. Mismatched cells that were SOLDERED, not spot welded, combined with hilariously under-sized between the cells, are a failure waiting to happen. Best case scenario, it just stops working eventually, but the chance that one of these cells eventually bursts is VERY real.

First, you directly soldered the battery, then you use those tiny wires. Eh...good job?!

For fast charging? Please make a video with 2 or 3 usb and usb type C!!! Thanks in advance!! 😊🙏🏻

Catchiest tune 😁

It really helped

Nice tutorial but that would be a 15ah battery bank not even close to 50ah, you have 7 cells in parallel "if they are 2200mha each cell" that is 15,400mha adding more groups of cells in series adds voltage not capacity.

Esta chulo para un campin si señor 👍👍👍

Nicely explained video thanks a lot

Agora descobri de onde o Celso Portiolli tirou aquela idéia kkkkkkkkkkkkkkkk

you lifepo4 11.6v 15AH full charge battery ( 13v.) Cut from charger oh!! charger High voltage now!!! ( charger no load )

Dude, tq for sharing!

I WANT MAKE POWERBANK FOR NOTEBOOK, NICE VIDEO...

great job,... but the 2200mAh battery is just 2000mAh max. current and the 21x2200mAh ~ 46500mAh not ~ 50000mAh this projects are making with spot welding and nickel strips this copper wire is too small and warms up this Lithium battery protection board is a good choice the 12V batterys charging voltage is 13,5V - 14.5V at the moment not 12.6V then I forgot the soldering iron cleaning is important for good soldering :)

Can i use this to make a insect hunter? I need her to complete my research Answer me please 😉

Thank you guy, I like this video, you use fewer materials and tools as what I am having right now I bought Li-ion 9800mah for more than 30 pcs I did not made research before buying, It need to refer to capacity of the module BMS at first priority .in the market they have for about 40amp,mine 300amp totally. Total cost it will be higher than just buy ready one to use in the market. I just need to do assembly for changing phone with my solar system without worry everyday about battery will run out. But it Seem like I need to keep it somewhere no using for almost the rest of it.

Actually you can use power bank modul with at least 2A current,

The video is very good, but you have to improve a lot in welding

Sir I like it but I confused how I know charge is complete or full?

You done this really good but there is USB port only one. There is two usb ports in case you can charge both devices well u try . Thanks for the video 👌

Thanks for sharing sir new supporters here

You mixed different mah batteries will there be problem with charge or not ? As you mixed different mah batteries togeather

21 X 2200 = 50000 its magic of math

It looks like a boomb

Pretty neat👍

It would take a week to charge that power bank.

Horrible soldering job

Fit with solar 20w. 12v. charge lifepo4 11.6 v 15AH

Hola buen día le podrá agregar un panel solar a su power bank? Sería genial si lo hace haga un vídeo de cada paso y los materiales gracias estaré atenta.

Mother of soldering .. my god.

7 X 2,200 = 15,400mah, approx 50% capacity for used batteries takes the capacity down to 7,700mah

Excelente !! bravo

perfect=τέλειο!!!!

HAHAHAHA he said 50.000 mAh!!!

that's insane bro,hope you live close enough to the fire department

do all batteries have to be the same amps? They are the same voltage but some are lower mAh (1000mAh to 3600mah).

Looks like time bomb

Из говна и палок

Very strange decision !!! The wires that you connect are too thin. The battery protection module for the wires is too powerful. It should increase the cross-section of the wire at least to 0.75 mm, then the assembly will be quartic! You did not measure the capacity of the batteries, if it is different, your wires and batteries will burn

Hi sir today making this one 🎉u r inspired me thanks a lot❤

This battery more or less is near 31~34 A 5v

Ставь like если ты Русский ! Довай посмотрим сколько нас на этом канале .

Amazing man

What is the soldered wire in 18650 batteries? Thank you very much.

So 600mAh??? deveria ser no minimo 2000mAh!!!!