Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [powerbanks]

64 questions
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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 option: Jackery Explorer 500. But its capacity…
Tamila Ambeon
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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 solar power banks with 5 V/4 A, only some with a…
Thiago2104
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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 appliances. Why does using a pure sine wave inverter…
Franck Dernoncourt
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How many times a power bank can charge a smartphone?

I am creating 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 charged? I found that it is 15A/1.821A or 8.2…
Awais Saeed
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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 someone with more experience to please have a look…
Gift Mwailika
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1 answer

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 chips to do this job but I would like to build…
ZenerX
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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 voltmeters (DVM) to be sure these are not at…
Roland
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A proper way to stop power banks to turn 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 to power it from a power bank. The problem is…
sx107
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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 wired that cell in parallel with the single 6000mAh…
Futurama140isgone
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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 all of the power banks have a voltage regulator…
S.H.W
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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 a second, which resets it and has corrupted the…
c.sh
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Why USB power banks tend to have much larger capacity than cordless tool batteries?

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 cordless tool batteries only go up to 5Ah (I think…
Frostywood
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Taking more than 2.1A from a two-port "2X 5V / 2.1 A" USB powerbank?

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 "2X 5V / 2.1 A" (it's got two usb outputs). (while…
DhP
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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 the output of the circuit to the DC adapter…
naserco
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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 3.7 volts and it works just fine but the cells…
Rehan Ullah
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