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Where I can buy the Samsung 35E 18650 3500mAh 8A -Protected Button Top Batteries.

qxp

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I think your camera will focus better if you make it parallel to the table. Otherwise all the distances are different.
 
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WhatsApp Image 2025-01-11 at 16.46.40.jpeg


WhatsApp Image 2025-01-11 at 16.46.03.jpeg
 

qxp

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So I am pretty sure this is a barrel connector - just pull it out, connect wires to it and plug it back in. It's quite possible that the PCB contains a BMS, but it is hard to see - if it is there must be on the other side. Check the item description first to see if they mentioned it.
 
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Show me what should I connect to the black and green part of the connector. I have no idea.

In addition I'm looking for a new enclosure that has almost the same size of the main one,that can fit well inside it. It is useful because I don't want that the electric / electronic parts touch each other. It should have a door on top that I can open and close. I've thought about something like this :


but cheaper and it shouldn't be a docking station,but a simple enclosure. The door on top is useful because I will use it to exchange the dead batteries with a new set of batteries. It will be easy as open,remove the dead batteries,put the new ones and close it. The only parts that I need are the following :

Istantanea_2025-01-11_22-40-52.jpg


Istantanea_2025-01-11_22-41-07.jpg



The idea is to cut an hole on the top of the new enclosure and to be able to open and close the door that's under the hole,hole that belongs to the second enclosure,that will also have the function to isolate the hardware components between each other.

Do you have any idea about where I can find it ? Or better,I'm having some troubles to find the right key words to find a relevant category of useful stuff.
 
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qxp

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Messages
131 (1.28/day)
Show me what should I connect to the black and green part of the connector. I have no idea.
What do you mean by black and green part ? Just put two wires in, tighten screws with a screwdriver, check polarity with multimeter and you are done.

Also, do you have a manual for it ?
In addition I'm looking for a new enclosure that has almost the same size of the main one,that can fit well inside it. It is useful because I don't want that the electric / electronic parts touch each other. It should have a door on top that I can open and close. I've thought about something like this :


but cheaper and it shouldn't be a docking station,but a simple enclosure. The door on top is useful because I will use it to exchange the dead batteries with a new set of batteries. It will be easy as open,remove the dead batteries,put the new ones and close it. The only parts that I need are the following :
[...]

Do you have any idea about where I can find it ? Or better,I'm having some troubles to find the right key words to find a relevant category of useful stuff.
No idea. Also this sounds too complicated - isn't the idea of rechargeable batteries is that you can recharge them ?
 
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What do you mean by black and green part ? Just put two wires in, tighten screws with a screwdriver, check polarity with multimeter and you are done.

I still don't understand what is this :

Istantanea_2025-01-12_14-48-35.jpg


and I didn't understand which kind of wires should I attach on that holes.

No idea. Also this sounds too complicated - isn't the idea of rechargeable batteries is that you can recharge them ?

sure,that idea was useful when I should remove the dead batteries. I was looking for an easier way to do that,instead of open the cage at the top of the case.

Can you give a look at the image below ? I tried to connect all the cables,but not every cable is at the right place. Something is wrong.
Can you help me to connect every cable at the right place ? I also don't understand how to recharge the batteries. I suspect that a cable is missing.

Senza titolo.png
 

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qxp

Joined
Oct 27, 2024
Messages
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I still don't understand what is this :

View attachment 379695

and I didn't understand which kind of wires should I attach on that holes.
Its a screw terminal, it is meant to hookup wires, you insert wire into the hole and tighten screws. On the picture it shows which one is positive and which one is negative(ground). Also see below.

sure,that idea was useful when I should remove the dead batteries. I was looking for an easier way to do that,instead of open the cage at the top of the case.

Can you give a look at the image below ? I tried to connect all the cables,but not every cable is at the right place. Something is wrong.
Can you help me to connect every cable at the right place ? I also don't understand how to recharge the batteries. I suspect that a cable is missing.

View attachment 379714
So ideally, you should have a manual for each piece that tells you which voltage goes where. In particular, the computer board has what looks like a barrel connector on the left which is probably designed to power the whole board. You need to know what range of voltages are acceptable to that barrel connector. The connector you are pointing to is blurry and I don't know what it is. Could be micro-USB could be micro-HDMI. If it is micro-USB it might not be the connector that accepts external power - check your manual !

The battery module looks to have two barrel connectors, and my guess is one is input through which you charge and the other is output. But it is a guess and you need a manual or schematic to tell you which voltage is where.
 
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Hello.

I've bought the TNTOR 10000mAh power bank to power on my tablet. It has 3 ports :

TNTOR 10000mAh.png


Below you can see the soc that I want to power using the power bank :

Senza titolo.jpeg


The board is the RockPro RK399. It should be powered through 12V / 3A as you can see below (you can find the full specs of the board here : https://wiki.pine64.org/wiki/ROCKPro64

Istantanea_2025-01-22_21-57-01.jpg


What I don't understand is what cable should I use to connect the barrell connector of the board (that requires 12V / 3A minimum) to the powerbank ? And to what USB port should I connect it ? USB A / USB C or Micro USB ? As you can see all these 3 ports are 5V / 2A max input,while the board needs 12V / 3A minimum ; are these voltages compatible ? Can you point me to the right products (cable and / or converter) that I should buy to be able to turn on the board using that power bank ? thanks.
 

qxp

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I think you powerbank was meant to power devices like phones that use USB-C as power input. It might work with Raspberry Pi. Your board needs 12V/3A which is more than this powerbank can provide.
 
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I've installed FreeBSD on the board and it has been able to enable the display and it booted wonderfully on the 8 inches display that I've bought :

2.jpeg



Now,just for the sake of my curiosity I want to evaluate how much money it will cost to me to print a new enclosure. I'm trying to modify the original stp file created for the playbox because it has been created for a smaller display. I would like to ask you if u can suggest me some company that can print 3D cases for phones and tablets.
 

qxp

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Nice !!

JLCPCB does CNC machining and 3d printing. You can try to price out how much for an aluminum CNC machined case. Alternatively, you might want to try to laser cut and bend it out of stainless - try OSHCUT or SendCutSend

Both accept 3d models like you would for 3d printing, you can make the models in FreeCAD (I suggest you get the very latest version, not just what shipped with your Linux distribution). You might need to adjust your model to fit your manufacturing method. 3d-printing can have problems with overhangs (needed for ports), CNC has it quirks, and obviously not every shape can be bent - though a box is a good fit.

Also, there are companies that sell custom enclosures - you use them for the industrial electronics in small quantities. You might be able to get them to do a thin enclosure for you. Take a look at FrontPanelExpress - you would need to download an application to design your enclosure, which might be for Windows, but runs fine in wine.

Links:




 
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I've started this thread on Reddit :


at some point one guy wrote this interesting sentence :

Can have it detachable via a port like xt30, no need for a usb-a which has to boost the voltage and the buck it for the tablet you lose efficiency there...

Can you explain it more ? It seems interesting,but I don't understand if and how I can make something concrete with it.

Point is that I don't like to make a tablet that looks like a brick.

Can I use a smaller battery pack than the 18650 based one? For example, can I use a certain right amount of button cells ?

Does exist a small UPS that can accept cr32 batteries (or any other small battery,like the Nokia BL-5C 1020mAh 3.7V 3.8Wh) ? Because these batteries are smaller than the 18650.
 
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qxp

Joined
Oct 27, 2024
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Not exactly sure what he means either, but long time ago the laptop batteries were detachable modules, usually in the back and were easy to swap. If you wanted more battery life, just carry a spare. If the laptop is slightly bigger in the back no harm as it works like a stand. Besides, thinness is just a marketing trick introduced by Apple. I don't care for too thin devices (especially the phone !), I care how light and convenient they are.

You can also use different batteries - for example AA Ni-MH ones. They have an advantage of many more charge/discharge cycles than lithium-ion. You would need an appropriate BMS.
 
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Can you share with me some model of mini ups that can accept the AA Ni-MH batteries ? at least one,so that I can search more of them by myself by using the correct key words and features explained on the (amazon or whatever online shop) link. My hope is to find one that has a depth a little bit less than 2 cm. That's the size that I think acceptable for not having a brick instead of a tablet.
 
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qxp

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Not really sure - I usually use them as replacement by alkaline AAs. Just mentioned them because they are thinner.
 
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qxp

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I have a similar one powering my Raspberry Pi - worked fine for years.

One difference - older Raspberry Pi's need 5V and for them two lithium-ion batteries are enough. Doublecheck your power requirements - I thought you needed 12V.
 
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Not good. For two reasons :

1) a depth of 3.5 cm is too much
2) the Rockpro64 RK3399 board needs 12V,not 5.

What's wrong with this ?

 

qxp

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I don't see anything wrong with it. They mention protection, so chances are it has BMS inside the package. Not really sure. Try carefully. I would suggest to get two or more just in case one is wonky, so you can compare. Also you can charge one while using the other.
 
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This is wonderful,it is so slim,less than 1 cm !


12.000mah : with a medium usage of the tablet,how many hours can it last ?
 

qxp

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Can't tell dimensions from the picture - is it it the size of the tablet ? Also, how many volts does it provide ? To answer how long your tablet lasts first measure its current draw at typical and max usage.
 
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Can't tell dimensions from the picture - is it it the size of the tablet ? Also, how many volts does it provide ? To answer how long your tablet lasts first measure its current draw at typical and max usage.

it takes almost all the space inside the enclosure. There isn't enough space for both the power bank and the board,but I can put the board above the power bank,because I have 3 cm available inside the enclosure,1 cm (of depth) is taken by the display,1 cm by the power bank and the rest is for the board.
 
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Give a look at this :

Senza titolo.jpeg



That cable is wrong. Can you suggest me one good cable ? it should end with a barrel jack not with a mini USB connector. Thanks.
 

qxp

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You can make your own cable - just buy the barrel jacks. The problem is voltage - have you compared how much you need and how much that 3-cell module provides ?
 
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