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Questions tagged [powerbanks]

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What is the role of the MOSFETs in this PCB protection circuit other than as a CFET/DFET?

I want to learn the role of the MOSFETs here in this teardown video. As mentioned in the video it is part of the protection PCB for a powerbank.
Braian May Capitulo's user avatar
1 vote
1 answer
47 views

Will this Ebike powerbank circuit work?

A noobie here. I'm making a powerbank for my ebike. The ebike that I have has a power supply that outputs 42 V 3 A. I'm trying to mimic that with my power bank so that I can plug the powerbank into ...
O M's user avatar
  • 11
0 votes
0 answers
37 views

How to combine or use batteries having different capacities?

I know that batteries can't be connected in parallel even though they are the same type (eg. Li-ion) if they have different capacities. I have several of those and want to use them to make a desk ...
Ömer GÜZEL's user avatar
8 votes
2 answers
1k views

Power bank or fire hazard?

I do have a bunch of 18650 LiPo cells, salvaged from various sources. Now, I happened to come across a variety of power bank cases on Amazon which mostly look like this: Even a cursory look tells me ...
Florian Echtler's user avatar
0 votes
1 answer
70 views

Battery Bank Replacement [closed]

I have an old power bank with swollen battery with the specs you can see in image 1 This is the module, but I can't find any specs nor schematics on the internet. The image below will show the full ...
Johan Darmawan's user avatar
0 votes
1 answer
127 views

Controlling power bank via USB

I've got only a basing electronic background and I'm more experienced in programming :) I'm going to use some power bank (PB) device with USB connectors to provide power to my embedded system. I ...
user2699113's user avatar
0 votes
3 answers
103 views

18650 parallel power bank cooks the furthest batteries

Against my better judgement I bought one of these 18650 power banks (see image). The reviews didn't disclose any issues and this sort of tech is so common now I never really thought much of it. It ...
Ben's user avatar
  • 1
0 votes
4 answers
120 views

Can you measure a powerbank's battery voltage at USB input connector?

I'm currently building a portable device, that is powered by a powerbank. I want to be able to measure the current battery "percentage" of the powerbank, with an esp32. For this i thought ...
Tom4211's user avatar
0 votes
0 answers
88 views

USB-PD DRP from a single LiFePO4 cell

I am about starting a project with LiFePO4 pouch cells. The idea is to create a powerbank from a single cell. The powerbank must have an input/output USB C connector with 65W minimum power (100W ...
FrozenMind's user avatar
0 votes
1 answer
90 views

What indicators can I use to decide whether a power bank which I am interested in buying will appropriately regulate current and voltage?

Anker, one of the largest manufacturers of power banks, often indicates in its ads that the product in question uses a specific system, MultiProtect, to avoid stressing the phone battery which is ...
novice's user avatar
  • 101
2 votes
1 answer
390 views

Understanding power bank discharge circuit

I am trying to understand the charging and discharging procedure of a lithium ion cell. Eventually I would like to be able to build my own power bank, I understand that there are existing power bank ...
ZenerX's user avatar
  • 21
1 vote
2 answers
468 views

How to use a USB powerbank for my electronics project when it starts with 2 or 3 V?

It seems appealing to power my small electronics projects with a 5 V USB power bank, however, it starts with 2 or 3 V, not 5. How come, and how to get a reliable 5 V output? I tested with 2 digital ...
Roland's user avatar
  • 871
3 votes
1 answer
3k views

Can I use a power bank of 5 V/3 A to power an Orange Pi 5?

I'm trying to build a portable PC with the Orange Pi 5 16GB RAM model with a touch screen and powered by a solar power bank. I saw that the Orange Pi 5 requires 5 V/4 A to be powered, but I can't find ...
Thiago2104's user avatar
0 votes
3 answers
935 views

Charging laptop with the DIY powerbank

I want to charge my laptop with DIY power-bank which has variable voltage output. Laptop peak consumption is 65 W and the power-bank has plenty of power to deliver it as it was previously used as ...
Markonioninioni's user avatar
0 votes
2 answers
103 views

Can I use a power bank to power my laptop during a blackout? [closed]

I am wondering if it's possible to use my ThinkPad L430 laptop with a power bank as a power source during a blackout. The laptop's power consumption is between ~35 to ~42 watts. Its battery is always ...
Kira's user avatar
  • 1
0 votes
0 answers
47 views

Relay to toggle 2 power sources

I wanted to use some MOSFETs for my power bank/almost UPS but I will do it first with a relay to keep things simple. Is my relay connected correctly in this (uncompleted) diagram? I guess I can split ...
Mathieu's user avatar
  • 31
2 votes
3 answers
151 views

How many times can a power bank charge a smartphone?

I am making a power bank with 3000mAh 18650 cells in a 3S5P configuration. This will give me 189Wh, 12.6V, and 15A. Assuming an iPhone 8 has a battery of 1821mAh or 6.96Wh, how many times it can be ...
Awais Saeed's user avatar
7 votes
3 answers
3k views

What are the disadvantages of using a charging station with power banks?

I want to have good power system for my van. I liked Jackery Explorer 240 . Price is good: $219.99. But the problem is that its capacity is only 16.8Ah and only 2 USB ports. I can buy a more expensive ...
Tamila Ambeon's user avatar
0 votes
1 answer
78 views

Why are integrated USB PD PSUs with powerbank not more common?

Looking into the circuits and logic behind USB PD (in particular USB-C PD), I wonder why it is not more often done to combine a wall-plug PSU and a power-bank (battery powered PSU) into one. Would ...
3244611user's user avatar
3 votes
2 answers
912 views

Why does using a pure sine wave inverter help reduce audible and electrical noise in some electrical appliances?

I read on some power bank description: Stable AC Output: The built-in AC wall outlet uses a pure sine wave inverter to reduce audible and electrical noise in fans, lights, and other sensitive ...
Franck Dernoncourt's user avatar
1 vote
2 answers
9k views

A proper way to stop power banks from turning off, and how to power low-current devices through USB

I have a device with a microcontroller that is powered via a USB-C connector. It is a more or less a standalone device (a synth with a USB-C power input and a jack output) and probably user would want ...
sx107's user avatar
  • 1,109
0 votes
0 answers
42 views

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 ...
ffffffffffjhtyjui's user avatar
0 votes
1 answer
835 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, ...
Gigiux's user avatar
  • 113
0 votes
0 answers
903 views

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 ...
Dani's user avatar
  • 101
-3 votes
1 answer
153 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 ...
Timur Zhukov's user avatar
0 votes
4 answers
1k 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 ...
Harel Nobel's user avatar
0 votes
0 answers
212 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 ...
Shumail's user avatar
  • 109
0 votes
1 answer
926 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....
Jimmy Falcon's user avatar
1 vote
0 answers
1k 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 ...
Futurama140isgone's user avatar
1 vote
0 answers
520 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 ...
S.H.W's user avatar
  • 77
1 vote
2 answers
777 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 ...
c.sh's user avatar
  • 11
0 votes
1 answer
2k 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 ...
Sadat Rafi's user avatar
  • 2,519
-1 votes
1 answer
66 views

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 ...
N'moi's user avatar
  • 11
0 votes
1 answer
449 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 ...
pouya rahgozar's user avatar
0 votes
1 answer
133 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 ...
BELSmith's user avatar
  • 146
1 vote
2 answers
2k 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 ...
Frostywood's user avatar
0 votes
3 answers
799 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 ...
Marco Bobinger's user avatar
0 votes
1 answer
197 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 ...
Marco Bobinger's user avatar
0 votes
1 answer
1k views

How can I power an LCD controller board with a power bank?

I am new to electronics so need help. I salvaged the screen of a broken VivoBook E402NA laptop and bought this controller to turn it into an external monitor. Evidently, this controller needs 12V DC ...
tajir12457's user avatar
-1 votes
1 answer
297 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 ...
dev.nikolaz's user avatar
-2 votes
3 answers
2k 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 ...
Abedron's user avatar
  • 97
1 vote
0 answers
55 views

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 &...
DhP's user avatar
  • 143
1 vote
1 answer
183 views

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 ...
naserco's user avatar
  • 11
0 votes
3 answers
1k 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 ...
Oki's user avatar
  • 19
0 votes
1 answer
4k 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 ...
alsadk's user avatar
  • 101
0 votes
1 answer
545 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 ...
sgon00's user avatar
  • 103
0 votes
0 answers
27 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?
jmazaredo's user avatar
  • 111
0 votes
1 answer
182 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 ...
Shohidul Alam's user avatar
0 votes
1 answer
88 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 ...
StormInteractive's user avatar
1 vote
2 answers
888 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 ...
Rehan Ullah's user avatar