DIY 16x18650 Battery Bank with USB-C Power Delivery

a DIY 16 x 18650 battery bank. No welding, no extra BMS, and can give us access to
5v x 3a = 15w
9v x 2a = 18w
12v x 1.5a = 18w

Great for charging your cell phone, tablets, and some laptops. But in our next video we will go beyond those devices.

Item used
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[waitingonmarc]

This power bank is perfect for some cheap knock off 18650s I bought years ago. They have like a 15x charge cycle on them but I have like 100 of them and never knew what to do with them. I bought one of these power banks and threw a few of the batteries in them, wrapped it up and used it to power halloween lights.

[ericklein]

When paralleling 16 cells for an 18W PD powerbank you don't really have to worry about the cells continuous discharge current but when you look at the 100W PD powerbank boards and you're not putting many cells in series you ABSOLUTELY must do the math on the power output of the cells. AND THE CHARGE CURRENT LIMITATIONS.

For example the IP2368 is ia 100W bidirectional PD board. It can be used with a 3S/4S/5S*/6S* battery. Either NMC/NCA or LiFePO4. 5S/6S require changing out a component that has a 18V'ish limit. You also have to change resistors or short out solder pads to set the board up for the chemistry you are using and all the other parameters you can change.

But if you make a 4S1P battery for the IP2368 (3S is limited to 65W ) then you have a minimum voltage of 10V (but really I think you need a minimum of 12V and you really shouldn't be taking your cells below 3V in this kind of application if you want to get a longer cycle life).

12V*8.5A=100W
So that's a discharge current of 8.5A per cell. An LG MJ1 or NCR18650GA is going to be getting pushed it its absolute limits and then some even though they are 10A rated cells.
But what if you try to charge the pack using a 100W USB C PD charger?
12V*8.5A=100W
That's 8.5A of CHARGING CURRENT. Not a single 18650 currently supports that charging current. Just a couple 21700's support that as the ABSOLUTE MAX charging current but it will significantly decrease cycle life. Ideally you would want to use a 20W/30W/45W or perhaps at most a 65W charger.
20W charger=cells rated for charge current of 2A
30W charger=cells rated for a charge current of 3A
45W charger=cells rated for a charge current of 4-5A
65W charger= Molicel P45B, P28B, Samsung 30T, Samsung 40T, Lishen LR2170LA and that's about it

Obviously if you build a 4S2P pack you give yourself a little more flexibility but at the end of the day you should be using cells with a max continuous discharge current of 20A for a 4S1P pack if you are outputting 100W PD. Molicel/Samsung power cells/Lishen LR2170LA are the only options I would consider acceptable. Charging you would have to limit yourself to a 45W charge at absolute most. 20W or 30W would be better and would not significantly ruin the cycle life.

A 4S3P pack is kinda the point where things open up a bit and you can be a little less picky.

It's not until you hit 4S5P that you can even consider using 10 year old salvaged cells from laptops

So don't just buy one of these Powerbank shells that do fast charging and think you can just slap any old cell in there. If it does over 20W of charge/discharge then you need to do the math.

[Tarugo]

Update still working and no problems after a year?

[aaroncatolico]

*Which battery cells did you use & where can I get them? Your link is broken to batteryhookup.*

[Red_Sky_Farm_]

I'm sorry to revive an old video, but do you know the name of the company that makes the enclosure? The two links that you posted are no longer available. I am unable to find a 16 battery bank.

[guidosamson]

Is it to be trusted or willnit overcharge or blow your device up??

[rizwanahmed]

What is output wattage of device?
What if tge charging circuit gets out of order? Can it be replaced?

[johnrichards]

Can you charge and discharge at the same time?

[kaycetot]

Hi.. what do you mean by the voltage different? if my battery voltage is around 4.0vdc and 4.2vdc, is it acceptable?