Questions tagged [powerbanks]

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What should I know about safety when assembling a power bank from scratch? [closed]

I have a power bank module for 18650 battery cells which I want to use to assemble my custom power bank. What should I know about 18650 Li-ion cells to protect myself from electric damage (e.g. ...
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Using fast charger with power bank not supporting fast charge [closed]

I bought a power bank that does not support fast charge (both USB-C input and USB-A output parameters are 5 V, 3 A). It came without a charger. Therefore, I would like to charge it with my USB-C phone ...
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Multiple power banks to handle temporary increase in power demand

I have 1 PoE+ (Power over Ethernet) port from which I need to power 5 Raspberry Pi 4s. The recommended power supply for Raspberry Pi 4 is 5.1 V / 3 A which gives 15.3 so 5 Pis will require up to 76.5 ...
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0 votes
1 answer
141 views

Can I charge a laptop with a solar panel? [closed]

I have bought a 30W solar panel, with output: USB 2.0 : 5V/2.4A USB3.0 (QC3.0): 5V/2.4A, 9V/2A, 12V/1.5A DC: 18V/1.66A (Max) I would like to charge my laptops. I have seen this power bank of 90 W, ...
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DIY power bank with NiMH batteries

I want to do a DIY power bank with NiMH batteries, like this example... But I have 6 NiMH batteries with 2600 mAh and 1.2 V. I want to use a 18650 PCB LCD but they are designed for Li-ion 18650 ...
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  • 101
-3 votes
1 answer
110 views

Can I charge my laptop with powerbank? [closed]

I have a Lenovo laptop with a L16L2PB3 lithium-ion battery. It has 4610mAh capacity which is enough for 3-4 hours of power. I want to have an ability to charge it when no sockets are around and for ...
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0 votes
4 answers
66 views

I'd like to know if I can take a couple of powerbanks and connect them into one power bank

I'm kind of new in the electric things and I'm also a teenager so I don't have that much knowledge. I learned about Arduinos and very basic stuff so I would like to do this as kind of a project to ...
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0 answers
145 views

What can be possible reason for explosion and fire in battery pack built with 3S Li-Ios BMS

I recently made some 12v battery back using regular 3S Li-Ion BMS and 18650 cells. Unfortunately, 3 of them EXPLODED and one even caught fire on site. The BMS I used was almost exactly like this but ...
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1 answer
199 views

BMS 4S 40A Li-Ion balancer board problem

Trying to figure out how to use the BMS 4S 40A Li-Ion protecting balancer board that I got off Ebay. Revision 2.3, photo and schematic is attached. I am building a power bank. Got some new NCR18650b's....
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1 vote
0 answers
153 views

Can I connect batteries of different capacity in parallel?

I don't think this has been covered in other posts. I have a 3.7V 6000mAh li battery pack and three 3.7V 2000mAh li battery packs. If I wire the three 2000s in parallel to make a 6000mAh cell, then ...
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1 vote
0 answers
114 views

Power bank's output current

I'm wondering what factor determines the maximum output current of a power bank. Is it limited by the internal battery's current or the output current of the voltage regulator? Also I'm not sure that ...
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2 answers
296 views

Can a super capacitor in parallel make a power bank usable as UPS?

I want to use a power bank as UPS for my Raspberry Pi but it doesn't has pass-through power, so whenever mains power gets connected or disconnected, the power bank cuts off power supply to the Pi for ...
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1 answer
367 views

Problem Understanding circuit of 5-volt battery charger IC

The attached image is from the datasheet of IP5306 Fully-Integrated Power Bank System. What is the significance of adding 2 ohms (R3) and 0.5 ohms (R4) resistance in the circuit? It is expected to ...
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-1 votes
1 answer
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If I had 2xUSBA @2.4A/ea. but only 4A max output from 21W solar panel, would joining the usb cable leads together give me one safe a 5v/4A output?

Mission-Solar fast charge? If I had a 21W solar panel with 2 USBA/2.4A or 4A max outs, could I simply strip and match leads to form one USBC input to a USBC input on a Poweradd PD 30W Power bank and ...
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1 answer
143 views

Problem with using power bank for modem with dc dc booster

I want to run a modem that needs 12 volts with a power bank. I've used a DC-DC booster to increase the voltage of my power bank which is 5 volts up to 12 volts and there is no problem with that. After ...
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0 votes
1 answer
64 views

How do power banks like the OmniCharge, convert 3.7V to 120VAC? [closed]

I've noticed the cells are all put in parallel in these devices and it lead me to asking myself what kind of inverter could they be using? Like isn't it a bit inefficient to convert from such a low ...
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1 vote
2 answers
528 views

Why USB power banks tend to have much larger capacity than cordless tool batteries? [closed]

I have a 10000mAh battery pack for charging phones/tablet/whatever but I also have some cordless tool batteries which can be used in an inverter to power a usb charger similar to the power bank. The ...
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0 votes
3 answers
179 views

5V Powerbank not turning on automatically when > 100mA are drawn

In this project, I power cycle a RaspberryPi Zero over a 5V USB powerbank, please have a look at my previous question: Blocking current from Backup battery (3x1.5V=4.5V) when powerbank (5V) is turned ...
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0 votes
1 answer
100 views

Blocking current from Backup battery (3x1.5V=4.5V) when powerbank (5V) is turned on my timer switch [duplicate]

I'd like to power cycle a RaspberryPi0 each 1h. I plan to use a TPl5110 for this, which can be powered by around 2.5-5.5V. I want to deliver 5V to the Vdd-Pin using a powerbank. However, once the RPI0 ...
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0 votes
1 answer
478 views

How to power up an LCD Controller Board with a power bank

I am new to electronics so need help. Recently, I salvaged the screen of a broken VivoBook E402NA laptop, and bought this controller to turn it into an external monitor. Now, evidently this controller ...
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-1 votes
1 answer
77 views

How I can connect my device with input 15-20V to my power bank [closed]

I have a power bank from baseus 65w, which can be output 20V ~3.25A. That brick successfully charge my laptop with 20V via USB-C. I want to connect my another device which input: 15-20V 1A and have DC ...
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-2 votes
3 answers
870 views

12V from Mi power bank 3

I have an Mi 18W 10000mAh powerbank 3 which I want to use for my project. I need 12 volt output. Although this powerbank supports 12V output, this feature is probably proprietary. A PD decoy module ...
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1 vote
0 answers
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Taking more than 2.1A from a two-port "2X 5V / 2.1 A" USB powerbank? [duplicate]

I just bought a powerbank for intending of using it to power a Rasberry Pi4b But, it seems i did not do enough research regarding the requirements of the Pi model i have. The powerbank is listed as &...
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1 vote
1 answer
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Why does my power bank switch off when I use it to charge a toy battery

I want to use a power bank to charge the battery of a toy car. I used an old USB cable, connected the power lines only to a voltage step up circuit to step up the voltage from 5V to 8V, then connected ...
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0 answers
463 views

XL6009 boost converter as 8V camera (DSLR) external power supply - camera not turning on

I need my camera (Canon EOS 7D Mark II) powered in terrain for a long period of time (10 + hours, mostly idling.) I bought a dummy battery with a 5V to 8V boost converter (camera uses a 7.2 Li-ion ...
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0 votes
1 answer
993 views

What is the effect of using wrong DC adapter to power on an electrical device?

Electrical devices powered by a DC adapter have specific in/out voltage/current values, so as an example what will happen if we used an adapter with 9v/1A output for a 5V/0.5A device? Consider all ...
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0 votes
1 answer
89 views

If a power bank accepts multi voltage input, will the lowest accepted voltage choice cause bad effects on the battery?

I have a power bank which accepts 12V-24V as input for charging the battery. (It aslo supports 12V-24V outputs. But this is not related to the question.) Assume that I will charge the power bank only ...
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0 answers
22 views

Two same capacity/model powerbank. Output connected via Y connector (parallel) [duplicate]

If I have 2 same capacity/model of power bank and combine the output via Y connector (parallel), will there be any issue?
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1 answer
137 views

DIY Power Bank For Router & Fiber ONU

I'm trying to build uninterrupted power bank for my 9V 1A router and 12V 0.9A ONU. I have made a circuit Mindmap. But I think I have done some questionable things in it. Such as, I don't know the ...
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0 votes
1 answer
37 views

Powerbank instead of Alkaline D batteries

I am an avid fan of charcoal bbq and love fire starters/blowers like these. They require type D 1.5 V alkaline batteries which are increasingly harder to get and usually run out in the most ...
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1 vote
2 answers
296 views

Boost Voltage from 5V to 19.1 V

Long story short, I have a Toshiba laptop. Its adapter outputs 19.05 volt and 3A. I wanted to build a powerbank for my laptop. I have built one using Li-ion cells. 5 cells in series with each cell as ...
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0 votes
0 answers
46 views

Small powerbank, li-ion cell charging voltage problem

While ordering a replacement for an 18650 cell from a small powerbank, I've overlooked an important property of the battery. The old, broken one had 4.35 charging voltage and this is what the internal ...
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0 votes
1 answer
95 views

Can I draw more current from this battery?

I'm looking to build a power box like this one: The battery that I'll use is 12V 35Ah deep cycle battery, which has an initial current of <= 10.5A: Devices that I plan to connect are: On 12V ...
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0 answers
187 views

Mini PC stick can be powered with mains power adapter (5 V/2 A) but not with power bank (also 5 V/2 A)?

I bought this product with the hopes of powering it with a power bank: https://www.intel.ca/content/www/ca/en/products/boards-kits/compute-stick/stk1a32sc.html https://www.amazon.ca/gp/product/...
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2 answers
133 views

Building a powerbank into a record player

My "portable" record player has a 5VDC 2A input via a barrel power jack and I want to use a normal powerbank to make it truely portable. Can I just solder the 5V output of my powerbank to the 5V ...
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1 answer
50 views

How many routers can the Powerbank power and how long?

I have a power bank, Capacity: 27000mAh/99.9WH Input: 19V/1.6A AC output: 220V/50Hz 100w Max Router (MR600) Input: 100-240v 50/60hz 0.6A output 12v 1.5A
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0 votes
3 answers
2k views

How to boost a Power Bank's maximum output voltage? [closed]

I have an Anker ~27Ah Power Bank which has 3 × (5v , 3A) power output. Is it possible to connect the outputs in series and get 10v or 15v output with a current flow of 3A?
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1 vote
1 answer
82 views

Replace 173 Wh lead acid battery with 20000 mAh power bank

I have an APC BX1100C 173 Wh UPS that I use for my computer. I also have a 20000 mAh power bank with output voltage of 5 V. What do I need to do to replace UPS battery with this power bank? Is this ...
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1 vote
0 answers
132 views

Diagnosing USB Power bank shut-off on load application

I'm trying to create a small bluetooth boombox-style speaker, but am having trouble powering the device from a USB battery bank. Fundamental Problem: The power bank "shuts off" as soon as the load is ...
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0 votes
4 answers
80 views

How to know how much energy storage has powerbank? [closed]

I just looked to this question and I don't understand how to know how much Wh this powerbank has (click "Specifications" tab), because it has different output voltages and I don't know how to ...
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2 votes
1 answer
432 views

Will my DIY powerbank be safe? It will be charged using laptop chargers

I want to build a DIY power bank that can be powered using most types of laptop chargers. I do not have any background except personal interest and lots of videos and documents read online. I need ...
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0 votes
1 answer
39 views

Help needed configuring battery bank out of smaller cells

Due to availability and not practicality, I am attempting to build an as large as possible battery bank from 16 AH AGM batteries. The end goal is a large system that is charged with a solar system ...
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0 votes
0 answers
37 views

unable to charge the powerbank in this setup

The main objective is to make a perpetual powersupply (uninterrupted power supply) for a raspberry device. However, in the schematic below I have replaced the pi with a simple LED resistor since I was ...
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0 votes
1 answer
157 views

What would be the difference between the output of a power bank and a laptop usb port? [closed]

I have an encoder which I have been successfully using when powered from my a USB2.0 outlet on my laptop. I need to be able to run it whilst disconnected from the laptop and so tried powering it from ...
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1 answer
904 views

is it possible to get 20 volt 2a from 2 powerbank which have 5v ,2a 4x output?

is it possible to get 20 volt , 2 a from 2 power bank by connecting 4 usb port (each 5 v ,2.0a) . if can what should i use to prevent damage , short circuit , and catastrophic . i making a device ...
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0 votes
1 answer
115 views

How to unite three different batteries in to one powerbank [closed]

I'm absolute beginner in electrical engineering and I need help in building a powerbank using three different batteries with different characteristics. I have a sudden passion to implement this ...
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0 votes
2 answers
138 views

Two 5V2A powerbanks draw different current under same conditions?

I have 2 different powerbanks, both have 10000 mAh and both are rated for 5V 2A power input. I have noticed that they draw a different amount of current despite using the exact same charger (5V 3A), ...
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