Questions tagged [powerbanks]

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1answer
16 views

Why is the volatge fluctuating at the output pins of my dc-dc xl6009 voltage booster in a powerbank using tp4056 module?

i m making powerbank using tp4056 module and xl6009 dc-dc voltage booster . i have connected a usb type a female for output but my battery notification led is fluctuating because of voltage ...
1
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0answers
25 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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4answers
72 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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0answers
35 views

Design power bank with BQ24195

I want to design a power bank control board for a single-cell lipo battery. The IC I have selected is BQ24195 by Texas Instruments - datasheet here. I think it is perfect for what I need. It comes ...
1
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1answer
108 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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1answer
33 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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0answers
31 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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0answers
13 views

Build 9V powerbank from a generic USB-C PD (or QC3) powerbank [duplicate]

I need to use a powerbank with device with these requirements: 9V, 500ma. New USB-C with PD feature can deliver higher voltages than standard 5V and 9V (upt to 2A) is one of these. As far as I know ...
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1answer
78 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 ...
-1
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1answer
162 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 ...
0
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1answer
77 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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2answers
121 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), ...