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Questions tagged [battery-charging]

Please specify the battery type in your question. Include chemistry (e.g. lead-acid), voltage, number of cells and how they are connected (series or parallel), capacity (in A·h or W·h).

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21 views

Can a bad cell cause excessive heat in charging circuit?

Something I have noticed and am curious of. I had a cases where a lithium ion cell, is bad or dead and it seems to cause overheating in the IC chip on the charging circuit Today I was having issues ...
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1answer
132 views

Controlling alternator load for peddle bike

I want to create bike-powered alternator system to recharge 12 V batteries. People can only do about 300 W mex. To turn an alternator with higher torque requirements, especially when the battery it ...
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1answer
124 views

Arduino PSU with battery backup (SLA) and mains/battery monitoring

Please could somebody review my following schematic, as it is my first attempt at a PSU circuit. The aim of this circuit is as follows: I am using a 15V (150W) PSU to power an Arduino, 2 separate 12V ...
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55 views

TP4056 - Li-lon Battery Charger enable pin not working

I designed a small lithium battery charger with the IC TP4056 but apparently the enable pin (CE) is not working. My setup is depicted in the following block diagram: Basically the input voltage (...
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1answer
67 views

Do standard NiMh AA or AAA battery's have any kind of BMS or protection circuit built-in?

Do standard rechargeable NiMh AA or AAA battery's have any kind of protection circuit like over discharge? Or are there any circuits out there that do that kind of stuff? I want to power my Arduino ...
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1answer
319 views

Is it okay to connect 2 lithium ion battery in parallel to a charger that can maintenance 4.2V? (more detail in post)

So I'm planning to make a charger that can charge multiple lithium batteries in parallel with hope to use recycled one. I fully understand that they are dangerous when you do it incorrectly, so I just ...
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2answers
245 views

How does DW01a prevent overcharing and discharging?

I am not that familiar with electronics, it's just hobby like. Today I am reviewing the tp4056 and dw01a ics. That are used for battery charging. Actually there are no specials on these ics but I ...
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2answers
87 views

What is difference between DC current from dynamo and DC current from battery? [closed]

Dynamo generate DC current and battery also gives DC current. Here my question is when I use inverter, it worked with battery however doesn't work with same voltage of current from dynamo. Why? ...
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2answers
128 views

Calculating battery current during charging in CCCV

I am researching how (lithium-ion) batteries are charged using CCCV. Specifically, I am interested in the "constant-voltage" part of the process: My question is - how do I calculate current \$i\$ ...
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34 views

Can I Charge With An MCP73831?

Sometimes I need to take my laptop places and, it doesn't have the greatest battery life, sometimes maybe it only lasts 10 minutes. So after researching a bit I decided I wanted to build a li-ion ...
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1answer
101 views

Is is safe to let my PWM charge my 12V battery at 14.8V?

I have a 12V battery linked to my solar panels. In the middle I have a PWM charge controller, that is configured by default to charge the battery if Voltage if lower than 14.8. At night, battery ...
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1answer
46 views

what is the max charge current of BQ2057?

I have gone through the datasheet of this single cell Li-ion charge IC BQ2057 but I couldn't find the charge current detail
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1answer
52 views

Would this design carry too much current and damage battery charger ICs?

I'm planning on designing a system to charge multiple 3.7V 500mAh lithium-ion batteries simultaneously. The batteries are each going to be charged through a battery charger IC, here is the link to the ...
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1answer
59 views

Advice for a Solar Charger and Battery Project

I am a high school robotics teacher (no formal engineering training) and I am taking a group of students to Kenya this summer to work with high school students there. The organization we are ...
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1answer
71 views

Combining power input and USB data port for a Raspberry Pi Zero (W)

I am attempting to design some peripheral circuit around a Raspberry Pi Zero W for a portable project. It will be powered by a lithium battery. I want to bring out the USB port of the Pi; I also ...
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1answer
6k views

Li-po Charging circuit question (switching between battery and power supply)

I'm building a circuit containing a Li-Po battery and a battery charging chip. I do understand the working of the chip, but don't really get how to switch the system load to a normal power supply ...
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1answer
101 views

Solar charge set up damaging battery?

I've installed a 12V 80W solar panel plus controller and attached it to a 12V 105Ah leisure battery. At first it (appeared to?) work. The charge status on the solar charge controller was at max and it ...
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0answers
34 views

Power supply charging backup power - current flow via mosfet

I have following diagram on falstad Top +5V is main PSU (12V 10A). Bottom +5V is battery (12V 2.3Ah). I have load about 2-3A so I dont think diode is good solution. Well I am trying to achieve ...
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5answers
200k views

What is the minimum required voltage for charging a 3.7 V Li-ion battery?

I have a cell phone battery that has the following written on one side: 3.7 V 1000mAh Limited charge voltage: 4.2 volts I understand that the first line means, that the battery will always give 3....
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1answer
92 views

Charging 3P pack of 18650 batteries using a single TP4056, and protection standards

For a project at uni, I'm trying to learn to work with 18650s and TP4056s. One of the tasks is to be able to USB-charge three 18650s (Panasonic NCR, 3350 mAh each) in parallel, whilst also being able ...
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3answers
91 views

How Does A USB (non-PD) device modify the current it draws from a charger?

I understand at a basic level that a USB DCP simply advertises that it is a DCP, and then basically puts 5V on Vbus, and then the battery can go to town. With that in mind this is really a 2 part ...
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1answer
27 views

BMS for 2S Lipos

I have 2 lipo batteries in series, each has a built in protection circuit and these specifications: Voltage: 3.7 Vcc Capacity: 1000 mAh Maximum discharge rate: 2100 mA I need to charge them, but I ...
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3answers
120 views

What power adapter do I need to charge a 7.2V 4000mAh battery that I made? [closed]

I made a Ni-CD 7.2V 4000mAh battery. What power adapter do I need to charge it? How many volts and how many amperes should the adapter output? Each battery cell is 1.2 volts. I have a 9V 500mA ...
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2answers
56 views

Pulsed DC current measurement using arduino and shunt resistor

I am currently working on a project ( to develop a constant current pulsed DC supply) in which current has to be measured using Arduino's analog input (Upto 20A) passing through a variable resistance ...
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0answers
34 views

EV charging and charging station

An EV battery first charges through CC(Contant Current) method and then through CV(Constant Voltage) method. So this way of charging is made sure by the circuitry on board the vehicle for Level 1 and ...
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1answer
39 views

Board mount AC/DC converter design concerns

I'm going to use board mount power supply (IRM-30-12) for first time. It has class 2 protections as per datasheet. Does it really protect my digital circuit in case of Hazardous situations like ...
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3answers
90 views

What would be the most efficient way of wiring a solar power bicycle?

I have an electronic bicycle; 350 motor that runs off a 17.5 Ah battery at 36 volts. I've just ordered three 12 volt, 150 watt solar panels, that I'll wire in series to total 450 watts; giving 12.5 ...
4
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3answers
6k views

Do I need a BMS for Li-ion batteries connected only in parallel?

I have a device that runs on a single cell Li-ion / LiPo. The physical case for that device allows me to put in one to three 18650 cells. Unfortunately given the disposition of the cells, I can't buy ...
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0answers
114 views

How to connect 3 cell series Li ion charger and protection IC for each cell?

I am using max745 4 cell Li-ion battery charger to charge 3 cells in series. I want to put additional protection IC for each cell (NCR18650pf). Because I need to run the max745 always on as a backup ...
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2answers
61 views

Lead-acid battery charging fixed current stage specification

This post doesn't question the charging process or its theory. I seek to understand how to read the battery manufacturer's requirement of fixed current stage. They prescribe a current to be held at ...
0
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1answer
139 views

Drone Thermal Imaging solution: Power Supply Module - Design Review & Load Sharing Query

I'm designing a DIY Thermal Imaging solution for my DJI Mavic Pro drone. Whilst the full design has been included for background info, this post refers to the power supply module design. The pertinent ...
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1answer
104 views

Power bank DIY Build( Regarding protection circuits)

I have been toying with the idea of making a power bank as I have a few old laptop batteries lying around which are still working well. I plan to use these components: Constant current lithium ...
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2answers
156 views

Homemade Li-ion charger

I am trying to build a lithium battery charger (Li-Ion) for charging banks of 6s batteries of varying capacities (2-30Ah) from a varied DC input. Given that I need to supply CC/CV to charge these ...
0
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1answer
53 views

Using 4 AA batteries to charge mobile phone

There are three scenarios: 4 AA batteries connected in series would produce 6V. I'm planning to supply the output to an LM7805 regulator and produce 5V. The output from the regulator then will be ...
0
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1answer
150 views

Clarifications about charging a 9V battery?

I have a project in mind with Arduino but I wanted to use a battery to power all of it. I have to power a Wi-Fi module and a small servo/stepper for a short period of time, maybe a RTC circuit and a ...
1
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0answers
50 views

Li battery charger reference voltage problem

schematic datasheet I have designed a battery charging circuit for a lithium ion battery.When i connect a battery the charging IC seems to do nothing. Only when i use a multimeter probe to measure ...
1
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2answers
207 views

Charge and discharge LiPo batteries with BMS 3S

I am looking for a solution to power a Raspberry Pi connected to a LCD screen 10 inch with three LiPo batteries 3.7V 5000mAh connected to two BMS 3S for charge and discharge. I designed the following ...
3
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2answers
7k views

Can I charge a NiCd battery with a NiMH charger?

I have an old NiCd RC battery pack. It was not used for at least ten years but when I tried to charge it with the old charger I was suprised to see it still had some capacity. Now I just went and ...
5
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2answers
11k views

How can I use two TP4056 with two li-ion batteries, but single load?

I have two TP4056 modules (with protection circuit), which I am using to charge two batteries respectively, off a single power line. The modules are the ones that have charge output (B+/B-), and ...
0
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1answer
61 views

How can I limit the current drawn by a Li-Ion battery pack BMS?

I have a Li-Ion battery pack made with twelve 18650 in a 3S4P configuration, using an off the self Battery Management System (rated for 25A), that I purchased on aliexpress. I tried to charge it using ...
2
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2answers
62 views

Charging a Li-Po with a solar panel

I'm looking to setup my e-bike touring bicycle with a solar outfit so that it can charge on the road, but am unsure of the electronics. I appreciate the size of the panel will be huge, but this can ...
6
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2answers
257 views

Can the negative impact of mixing new and old batteries be mitigated?

Mixing old and new batteries is bad. But there are various options how they can be mixed, and I guess there are use cases in which certain ways of mixing can be justified. In my off-grid solar ...
0
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0answers
10 views

Charging DJI's batteries with USB PD

I want to charge DJI's batteries from USB TypeC PD charger. The charger can provide 60W output on its USB PD port. I'm planning to use an USB PD module (which gets me the 15V output from this PD port,...
0
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0answers
35 views

12V Lithium Ion Polymer Battery

I am trying to develop a product that requires a 12 V portable rechargeable battery that can output at least 2 A. Since conventional LiPo battery runs only on 3.7 nominal voltage, is it advisable to ...
1
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1answer
177 views

Can I make endless parallel li-ion connections?

I'm looking into building my own li-ion battery pack. I read about linking the cells in parallel and in series, and how to add a BMS. I would like to build a 12V pack with a very large capacity (mAh)....
3
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1answer
153 views

Lipo uninterruptible power supply?

How can you safely build an uninterruptible power supply with Lipo batteries? There are a lot of boards out there for connecting a charger to an external supply to build a UPS. However, all the Lipo ...
2
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4answers
162 views

How would you wire small computer to run on both batteries and AC power? [closed]

I'm trying to use a motherboard (Mac mini 2018 model) for a project that will require it to be able to run off batteries. The project is essentially building a custom laptop using the Mac mini mobo ...
0
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3answers
68 views

How to use a gas gauge?

I must have missed an article, lesson at uni, or something obvious because I'm struggling to work out how to write some firmware to use a gas gauge to get out a rough percentage of battery remaining, ...
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1answer
2k views

Block current flow in one direction with FET transistors

Is it possible to block current flow in one direction like a simple diode using FET transistors to avoid the voltage drop? simulate this circuit – Schematic created using CircuitLab I am not ...
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3answers
103 views

Li-ion battery pack from non- identical batteries

I'm building a battery pack for my portable speaker, and I'm using a random collection of second hand Li-ion cells. I'm going to have cell phone batteries with differing capacities and also 18650 ...