You are stupid. There is no more power. It only last longer.

You did not need to join the balancing connections with as heavy of wire. Since your cells are in a 6S5P configuration you could have kept a single strip down each of the balancing leads since very little current should ever flow. The most positive and most negative connections are the only connections that need to carry a large amount of current. The balance leads ensure that no one parallel set of cells goes over or under the preset voltage in the balance circuit. If one set goes lower than the rest the balance circuit will cut the power as soon as the lowest set of cells in the parallel string reaches the cut off voltage. The next time it is charged the balance board will ensure that all each set is at approximately the same charge voltage when fully charged. Since one pack can deliver 20A you can assume that the drill is not able to draw over that 20A in normal operation so as long as all your most positive and most negative connections can handle that 20A it won't matter that the pack can deliver 100A since the drill and even the balance board were not designed to go over the 20A. This pack as long as it is not damaged will likely outlast the drill since now the cells will not be abused near as much as they will share the current draw rather than one set having to provide the full 20A each string will now only have to provide 4A of current.

My partner has a lot of tools, so when he needed a circular saw, I ordered this one for him as a Christmas gift. kzfaq.infoUgkxYDKeIjKLOfcwTgdin7TtCutsz4MbIc43 He is incredibly happy with the purchase. He stated that he likes that it is powerful, but still easy to use and cuts very well. He mentioned that it is important to know the right tools for the job at hand, and this compact saw has been exactly what he needed for a variety of projects at his rental properties and renovations. He also appreciates the battery packs, as stated, he owns a lot of DEWALT tools, so he is able to always keep batteries charged as needed.

This is a great idea and so simple. Im building an ebike and are using powertool batteries but thought i would need to stack the batteries ontop of each other. Your way is way more efficient for space. Plus my 36 volt system would only need 2 chargers which i already have instead of swapping the batteries over or buy more chargers. I would just use threaded rod and nuts on the top to hold them together. Another great use would be to make your own powerwall this way.

cool I thought I was the only one to do this. I used x4 1.5ah packs making a 6.0ah. once I got it together I put a layer of tape around the cells then put the case together then used clear silicone in a caulk tube to make the cover. I smoothed it out with a straight edge and let dry. it's a little hefty but it's great for my grinder.

TL;DR: This is a long comment. I go into detail about multi-cell packs and at the end voice my concerns for mechanical, (not electrical) safety. So there's quite a few things going on here. that are advantageous, though maybe don't take it all the way to 5P configuration due to practicality and weight. -First: You're pentupling the capacity. This means longer run-time. -Second: You're minimizing voltage-drop. 18650 cells may be rated to give a peak output of 20A, but they sag like crazy at that current level and heat very quickly. The maximum output is "maximum current for 1 minute before catastrophic failure" or somesuch. Add more parallel cells, minimize voltage drop, get more continuous wattage out of the battery. Some of the drill motors are capable of pulling 80A+ peak (stall current) if the motor controllers let them. How manufacturers think that a 1P battery pack is even REMOTELY capable of handling that kind of current, I have no idea. The general rule-of-thumb when it comes to Lithium-based batteries is limit current to 1/4 "rated" maximum to preserve the health of the cell. Any more and you're damaging it internally every time you discharge. -Third: You're extending cell life by reducing both charge and discharge current-per-cell by a significant margin. Cells will survive far more cycles if charged at 0.5 to 0.2 their C-rating. Assuming a half hour charge and 2Ah cells, the charger likely outputs 4A. That means that now you're charge less than an amp per cell, which will significantly lower the load both in discharge and charge cycles. The only concerns I have are that the tabs need to be doubled on the end connections for load-bearing, (balance current is far less than charge or discharge current, so the middle connections can be a single strip; end connections need at least two since the full current of the pack charges/discharges through them). Balancing is done by charging through the entire pack, and bleeding off energy into a resistive element from the cells that are close to maximum voltage, while the others catch up. In essence balance charging is where the higher-voltage cells get charged "slower" than the lower voltage cells. Additionally, I'm concerned about structural integrity of the cells. Foam and tape are not good enough in an industrial environment; dust can still get in, metallic objects can easily pierce the covering and short something. I'd at least take some corrugated plastic material and wrap the sides to help protect from these sorts of dangers. Further, dropping or bumping the bottom of the pack while it is attached could cause the adhesive tape between parallel packs to come loose, or worse, break the solder points or put stress on them. In a worst-case scenario that's a recipe for a short and catastrophic failure. The best would be to 3D print a new case that covers the full size of the pack, (if you have such a resource available to you).

Well, that was fun, thanks for the video. pierre from New Mexcio

I am new to you. I think you are priceless. Probably one of the best teachers I have seen on KZfaq. Very thorough, to the point and also a great sense of humor. I have learned so much from you, and am grateful. Thank you so much.

Does the BMS limit the discharge current or does it only have a low voltage cut off? If u try to pull a lot of amps from a parallelled pack using one board, eg for a high power ebike battery. Would it still only allow the delivery of 1 cell?

Thanks for this video. Do you think the 4 Amh battery that is on shelf good enough for the go Kart or it needs more Amh? do you know how long the 2 Amh and 4Amh will last running before charging for the go kart? thanks again

Really good job, love the homemade brass screws.

This is awesome nicely done!

Absolutely love this project. I would pay good money for one of these 10 amp batteries to use on my scooter 😭

Absolutely genius. The home made screws! You channel deserves to be known world wide.

A few points to consider before using such mod: a. With this configuration the balance charger treats a whole series of 5 batteries as a single cell so it won't detect a failure in a single battery on such array. If one cell will fail it will overheat and damage the other batteries or even explode from the accumulating heat. b. The added weight makes it impractical to work with. c. I can't be sure that the motor can handle continuous torque that can be achieved through this mod. Overall - nice concept but should be made at least with battery charge management for each cell and some good heat spread in some way.

Could the battery you made the 12 volt 10 amp fit into the tray of a the battery tray of a razor e325

I noticed you left 1 BMS on to manage the charging and safety. will it be the same for one as for them large bank?

if you have 5 batteries of 2 Ah, what's the point to join them together? Is it to difficult to change the battery when needed?

Build a house on 1 charge... 😆 🏠 awesome

Hey, when making multilayer bat pack, for example 24 volts, can i just do 24 volts first layer and just do parallel the rest of the layers?. Just curious.

OK, very impressive. So how many of these Kobalt 24v would I need to power a electric Ford Ranger truck with a 96volt requirement. And how would I need to wire them up? I know 4 x 24 is 96volts. But I also know I will need to go several rows of 4s to get the ummm, duration the miles requirement for the day before recharging.

With the new 21700 cells there are now OEM batteries available with only 10 cells and 18 Volt 8 Ah. For cordless drills you normally don't need such big batteries, but other tools like circular saws or chain saws can benefit from it. You should never use soldering to connect lithium ion batteries. Even if you solder fast to limit the amount of heat going into the battery they will be damaged, especially at the negative terminal. All commercial packs are spot welded. Spot welding is the only recommendable connection method for round cells.

FORGOT IMPORTANT THING! With multilayer battery you must have NTC temp feedback for every layer!!! While charging bottom ones can get hot without controller board knowing it and they can get damaged!

Can you lift the drill with the battery pack installed?

Very nice but what are the measurements. Trying to build a battery pack and I might have to go down to 8 Ah to put it in ezip scooter with out modifying it.

awesome job dude very informational too I learned a lot thanks

Respect to the quality kraftsmanship

how do you balance charge the battery? yes the factory charger balance charge the top pack but theres no way the charger is going to detect each of the added cell to balance them. This is going from a 6 cell to 30 cell pack.. unless you wire up the added cell to a balance board and the the charger can support 30 cell charging... This thing will blowup.

His accent kept me watching lmao

when you wire them in parallel it is not amps, it is capacity. since you dont raise voltage, tool will probably draw the same amp. maybe more batteries will make it a notch stronger but again, tool wont draw like 5 times more amps :) but I see endings are thicker than middle ones(middle ones are just used for balancing-charging i think) so if you make something equal width to endings, it should be enough.

I built two 7s10p packs from Samsung 26c cells. I run them in series for my bike, and parallel for my Worx string trimmer. So either 52ah in parallel or 26ah in series.

So you taped some cells together, but what about the balancing? And the thermal protection?

Well done, really good video! :)

now i dont need to go to gym anymore haha :)

I need to make something like this for my Ryobi One+ angle grinder!

I do like your work mate... very concise and informative. The solar oven was a goodun too. All the best and I'll be looking out for your next work and what you do with the big bad battery pack

I remember seeing your first video about kobalt batteries yeeeears agoooo and I made this as well for my E bike. Works with original charger still too xD Keep up the great vids!

Is it cheaper to make 10 amp hr from 5 pack?

I know this is old video but I'm planning on doing something similar. Looking back would you now construct these in a different fashion? I recently bought many of the Kobalt 1.5ah battery packs(2 for $15) and now plan on putting 10 together for 15ah packs (24 volts each). I'll wire these in series to create 48 volt packs for our trikes. I am currently using smaller versions and they work great! The smaller versions were created with not taking the cases off but keeping them intact and jumping the terminals with custom cables to create 48 volt packs. I charged the packs by taking the cables apart (a pain) with four Kobalt chargers. I want to make the new packs similar to yours but thought you might have other ideas on how to construct them. Thanks for all your thought provoking videos and entertaining humor!

I want an inverter test on this beast, can it power a 1000W hotplate? If it was a 10A battery, that would be 50A x5. 50A * 24 = 1200W.

Dude, I'm seriously in love with your voice. It took me a while to place it, but you remind me of Hank Hills neighbor from Laos on King of the Hill.

That's a lot of sows, I never seen soo many sows altogedder. Love you videos.

hey Vuaeco......or anyone. is it easy or even possible to convert the new 24 volt batteries to be used on the Grayco hand held paint sprayer? The sprayer now uses the DeWalt battery pack.

Simple beautiful upgrades!!!! *MO POWA* my tools will love these.

Very nice job. Great idea. Thanks.

The problem you're going to have is that the BMS will still shut down at the original overcurrent setpoints, and may even error out if it detects charge current but too long a charge time. The BMS has to know what the capacity of the pack is, so if it thinks it's still a 2A pack and sees 2A of charging current for more than a couple of hours, it might just disable itself.

Great teaching, I learn a lot, can I do the same with dwalt batterries, or how about using usb adapters cap and conect them in series, like you did on the newest videos?, this is my plan, 2 (20v 5 ah) in parallel to make 10 ah conected in series with another 2 (20v 5ah) in parallel conected to a 12v 2ah in series to complete 52v 10ah for my ebike motor 1000w 48v, with that work? Thanks!

So where did you buy the screws?

Very nice setup. Really nice and clean soldering done. For your screws, you could of used all-thread and then put an end on it with a washer. I agree with a comment below about putting a new label on. Especially if you made some smooth sides and made it look like it "manufactured" that way ;)

5mm copper bus strips are compared with 15mm nikkel strips right ??

Are there a way to just connect them on parallel without removing the cases? thanks

Can I use this method to power this fan without frying it? Voltage: 24V DC Flow Capacity: 270 CFM Current Draw: 3 A

Would a 40 ah stacked run a 85 lb thrust 24 volt trolling motor.

I like this guy his accent is priceless.

Ingenious, very cool

I wonder how long that custom 10ah battery will run the Kobalt 24v fan for

Will your charger balance the 5 packs when charging?

How thick are the nickel strips?

Old but Gold. Very helpfull Video !!

it is brilliant!

what if you made a backpack that had 50 amps hours in it and then it wouldn't be as heavy

magic ! 👍

can you use copper wire instead of the nickle strips? or will that not work?

Vuaeco, the load/charge/discharge circuit is managing all of the rest of the batteries packs? The problem could be is that the BM is rated for 1 pack - it does not know the overall resistance with the other batteries inline.

cool!

One charge now lasts the life of the tool!

Outstanding buddy learning more thanks again for the great ideas take care stay safe 😊😊😊😊

I'll take my (stock) DeWalt 20v/60v 9ah pack any day of the week. Way more compact, and more flexible. Good project, though!

beautiful job

It would have been nice to see how you made the screws. I was thinking this is easy until you got to the screw part. Anyway, well done. :)

That was a great project. Thank you for the display. By the way, p,ease let me know, from where you got the Black CAPTON tape that was covering the entire battery pack. Thanks once again.

Love your videos. I see that you use these to run your scooters. Curious... would 4 of these, running parallel to 48v, power a Golf Cart? Or would it fall short in discharge or kW?

0:47 using DeWalt drill on Kobalt batteries. Lol

Its not too dificult 2 keep it in hand?

This was helpful, thank you

I've built an 10S10P battery for my ebike based on the lg cells from ebay. I got them for $150 which is great for 100 LG cells. The thing is that I have a $100 hobby charger but I want to build one for an uncle but the charger is expensive. It seems that I'll look into getting a 36/40v charger and one pack and wire them up and make a 22 Ah battery for an ebike. This may be a good way to have a cheap and reliable balancing charger. I also built a spot welder so there is no worries there.

Pretty Cool 😎

every powertool owners wet dream. a pack that will last all day.. i want to do this to my makita radio :D

Good video presentation. Would like to see a followup video showing if the extra current from the parallel arrangement will hurt the original charger circuit components or the the battery balance board. It may be damaging to the balance protection board which was only meant to balance 1 battery not 5. Make a comparison of a regular battery and the 5 banger on current or heat measurements of the charger and balance pcbs with the cases removed. We want to see if the extra batteries will cause over work of the circuits and cause heat damage to the power FETs, transistor, or cell balancing resistors over the longer charge and run times.

The only ones that need double shunts are the (+) and the (-) from each pack, as they're the only ones that carry full load current. The other tabs are only used for balancing the cells during charging and monitoring cell voltage; a single shunt wire will be plenty for that relatively very small current. That said... This 5lb pack is gonna make everybody think you're a wank-spank pr0n junkie with the one big Popeye forearm you're gonna get from lifting it. ;)

thank you

well deserved TU + sub. awesome job fun film. it must weigh about 50 pounds :-) your next one should be three times longer and make it into guinness world records.

Milwaukee and dewalt.... "hold our beers"

since you're stacking them in parallel, wouldn't the current be axactly the same? All you've done is add capacity

Ur a very creative genius with a sense of humor!

Your video is great man! I watch videos like these however I don’t think I am capable of doing this myself however would love to for my e300 currently SLA battery scooter.

Excellent work!!!THANK YOU!👏🌟

Not necessarily the first 10AH battery pack you can buy on the market... BUT, it is the first 10AH tool battery quite simply because you can't air-mail li-ion batteries with such insanely high capacities, and for manufacturers, it's cheaper and much faster to ship by air than water. No denying though, that battery pack MUST give you a pretty decent life and won't be subject to the same amount of stress as the stock ones since you're spreading the load across more cells. ergo... a better battery life and the longevity is increased significantly.

cool dude!!!!

Can the milwaukee 18v red lithiums be retrofitted the same way?

how you go work with dril now its 10 kilo The weight

It's great !

Very creative. Neat idea. But, for me it's way to heavy. I have a 4 ah battery now and was thinking of getting a 2 ah battery just to keep the weight down on my 1/4" impact wrench. Down the road I may get a 6 ah if I find the need, but for now, my 4 ah is perfect for long runs. Barry

I know this video is a little old. But at least in Australia, Milwaukee makes a 9Ah battery you can just buy off the shelf, and its about a third of the size of this. Still, pretty good video.

i think im gonna make a 100 Ah battery pack for my cordless drill, it would be able to stand up by itself from the floor, no table needed when im not using it, joke aside good job

love it. but will it cost more to buy the new battery pack then individual battery?

Great build! You didn't mention it ... but you probably did it. When you put cell packs together you should make sure each packs voltage is within .1 or 1/10 of a volt of the other. If you don't do this when you solder those strips onto the sides it can cause a lot of current to flow between the attached packs. This can cause damage to the cells in the packs. Liked !!

So how many miles did u get from this

how has it been working? no problems so far?

Good video bud keep up the good videos quick question how mach the battery you used worth. Link if you have from where you got them from. And how many ah discharge they get up to. Ty keep up the good videos.