Circuit to power an android device without the battery

I want to find someone to design a circuit that powers a mobile device without using it's battery.

The goal is to make a 100% usable android phone work with just the charger (battery removed).

The phone will be kept plugged to the charger so don't waste power on the circuit.

The phone is a Lenovo A1000.

The tested / working battery's output is ~4.1V while the charger is giving an output of ~5V.

The current is about 0.6A while the phone is running with 1A max for the charger.

I have already tried to plug the charger directly to the phone's + - but it didn't work.

Reducing the Volts of the charger to ~4.1V using resistors or potentiometer also didn't work.

Also tried to use zener diode but they warm up too much / too quickly.

I want you to design a simple/working circuit that I will have to approve.

All the components that you chose should be listed.

The circuit should be efficient (don't waste power when the circuit is on idle) without being complicated.

Thank you,


Квалификация: Электроника, Электротехника, Схемотехника

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О работодателе:
( 0 отзыв(-а, -ов) ) Athens, Greece

ID проекта: #23875645



Hey There, Hope you are doing good. I read about your project and I am interested in doing it, I am electronics engineer from India with 3 years of industry experience in designing and manufacturing of Electronics syst Больше

€77 EUR за 2 дней(-я)
(1 отзыв)

11 фрилансеров(-а) в среднем готовы выполнить эту работу за €87


hello i am a computer engineer,i have masters in computer engineering,i have experience for more than 8 years in arduino and electronics,i can make to u the required design that enables u to power on ur mobiel without Больше

€88 EUR за 2 дней(-я)
(27 отзывов(-а))

As an electronic architect, I have been working in PCB structure/design and firmware programming field for 8+ years. Here is a portion of the encounters that I worked back. - Schematic and PCB Format is utilizing Alt Больше

€20 EUR за 2 дней(-я)
(3 отзывов(-а))

hello sir, how are you. I read your proposal and i am interested in this project. I am an Embedded engineer (arm, pic, AVR, Arduino, SOC ble chips, ZigBee, GPS, LED, LCD display etc.) and PCB designer. You can check m Больше

€70 EUR за 7 дней(-я)
(2 отзывов(-а))

Hello, sir based on your description. I understand that you want to use your Lenovo A1000 without battery I would like to tell you that the phones and the battery management system in the phone are designed to work onl Больше

€150 EUR за 20 дней(-я)
(3 отзывов(-а))

What you described is exactly right. The step down converter, providing adequate current needs to be made to use it without battery. What you tried will not work. We can design such device for you.

€200 EUR за 15 дней(-я)
(0 отзывов(-а))

As i understand you need a circuit diagram (product) that runs lenovo A1000 without battery using simple USB mobile charger

€88 EUR за 21 дней(-я)
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Hi im high level electronics engineer and this job very simple for me. Because power electronics my profesion.

€55 EUR за 1 день
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Hi, I have worked in battery charger from long time. I found your project interesting. You can go through my portfolio and Send me text for further discussion. thanks Vaibhav

€111 EUR за 7 дней(-я)
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I would like to understand clarify some points The AC lines is 127V, 277V or both (wide range) The efficiency your are looking for in what range it is? The output voltage if I understand right is 5V or 4.1V?, the curr Больше

€65 EUR за 7 дней(-я)
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Hi I would give you the schematic and gerber files of a small pcb which would take the chargers 5V and convert it to the desired voltage (adj.). I have an idea for an option B which I would recommend Relevant Skills a Больше

€35 EUR за 1 день
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