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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16 views

Unexpected battery float voltage in BQ2057WSN charging circuit

We have designed a changing module using BQ2057WSN IC to charge a 7.4V, 6600mAH Li-ion battery. My supply power is 12V,2A SMPS. I have set my charging current to 600mA. The battery is charging, but ...
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50 views

MPPT controller with battery management system

I'm trying to create a little solar charger with backup battery for my Arduino. I would like to use a MPPT controller for the solar panels. I found a few solutions like the IC CN3722, but all of these ...
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1answer
79 views

Building a circuit to replicate a LiPo battery

We want to keep a Xiaomi Mix smartphone powered on for a very long time (>6 months) with power from the USB cable. This is not recommended by the manufacturer since the battery will be constantly at ...
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2answers
3k views

Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: ...
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1answer
152 views

Help me to understand VOOC fast charging for lithium ion batteries?

I know common VOOC charger have fast charging rate of 18W(9V/2A). But how it possible even current is only 2A. I mean 2A current have only stored charge 2000mAh(2A*1h). How changing voltage can charge ...
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1answer
71 views

How to charge and use a salvaged laptop battery with BMS?

I have salvaged a laptop battery but I have no idea how I can use it like a normal battery. It does have a 10 pins connector but I have no idea what they are doing and how I can use them. Should I ...
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1answer
85 views

How does Home UPS Charge battery?

I have a pure sine wave home ups with a mains 1000VA transformer in it. Transformer is 6.7/220VAC. How does it charge a 12V battery with 20A????????? 6.7V side is connected in H bridge mosfets. ...
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1answer
95 views

Communication between two Bluetooth devices [closed]

My supplier tells me that communication between 2 bluetooth devices requires authentication by an app. When reading online I believe it should be possible, but am not 100% sure. One article from EDN ...
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1answer
33 views

BQ2057WSN Charging current issue

Today when I was going to measure charging current in BQ2057WSN charging circuit (Input Supply: 12VDC, Battery: 7.4V,6600mAH) by putting a multi meter in series with Q1 (shown in figure) and measured ...
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33 views

Power management controller with multiple inputs

I have planned a (quite complex) controller for a project based on a Raspberry Pi (web UI, logging, camera framegrabbing/video processing, LTE uplink), i2c sensors (assortment of environment sensors), ...
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2answers
42 views

BQ2057WSN Charging issues

I have designed a battery charging Module using BQ2057WSN IC to charge a 7.4V,6600mAH Li-ion battery. According to my calculation the charging current is set at 625mA. The input power source to the ...
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0answers
36 views

BQ2057WSN Circuit Heating issue

We are using BQ2057WSN charging IC to charge a 7.4V, 6600mAh Li-Ion Battery by providing 12VDC,2A power supply. According to my calculation the charging current is set at 625mA. But while charging, ...
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2answers
3k views

Charging ~40 18650 cells? - Huge DIY powerbank

I have a bunch of 18650 cells from laptop batteries lying around and I was thinking about making a huge powerbank, which I could use even to charge my laptop. Most of the thing I have an idea how to ...
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2answers
922 views

Powering circuit directly from USB while charging li-ion battery side by side

What I am thinking of implementing: 1. I have remote monitoring circuit using gsm which senses electrical parameters like phase, power, ac supply etc. Now considering case of no ac supply available ...
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1answer
41 views

Trying to understand Battery Chargers vol.2 [duplicate]

The answer by Bill dubuque was very helpful and got me to read the complete datasheet of MCP73831/2, but there is one thing from the datasheet that I don't fully understand and is the cause of lots of ...
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1answer
115 views

Designing a 2S Li-ion charger with 5V 2A input

I'm interested in designing a few similar charging circuits based on the specs of the title which is getting a charging for 2 cells in series(or more) from a 5V input. Now my question is: Assuming I ...
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2answers
109 views

Li-ion CR2 / 15270 voltage and charging circuitry

CR2 / 15270 Li-ion batteries normally come as 3.0v. I thought Li-ion and Lipo batteries were always 3.7v, how is that possible? Does it require a different charger circuit than normal 3.7v li-ion/...
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1answer
101 views

Determining Battery Charging and Discharging Rate Based on Max Current and Nominal Voltage

I am having difficulty in figuring out some basic stuff and confused with multiple equations. I am working on a simulator which simulate a hybrid vehicle journey for some period of time. During ...
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1answer
339 views

Charging series connected batteries independently

Just want to make sure this charging configuration will work. Basically we have two solar panels and two solar charge controllers independently charging one of the two series connected batteries ...
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1answer
95 views

Solar and Batteries [closed]

I want to ask a few questions that relate to solar panels and the charging of batteries. I have looked all over the internet for answers but have not found anything that answers my concerns. The most ...
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3answers
94 views

Wind turbine charger controller

I need help on my design which includes a wind turbine, charge controller, battery and load. The question is, what will happen to the load if the wind turbine is charging the battery and while it is ...
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2answers
100 views

Please check my solar outlay for Lithium ion battery

I'm in the processes of 'solarising' my electric bike, and would appreciate a more experienced opinion on how I intend to do it. The motor is a 350W running off a 36 volt battery. I intend to get ...
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3answers
217 views

How to connect LED strip to be powered by charger and batteries

I plan on using it mostly plugged in, batteries are there just for extra mobility and won't be used most of the time. Don't know lot about batteries so in first scheme I added a switch (pos. 1 ...
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1answer
93 views

Solar charging LiPo batteries

I would like to build a IoT project which needs need 5V. I have some 6V 1w solar panels which I would like to connect in parallel to charge some LiPo batteries 3.7V https://www.ebay.de/itm/6V-1W-...
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1answer
114 views

Converting 6c (3s2p,4.5v) DC motor to 1s4p 18650 charging/protection

Having a hard time figuring this one out, I am trying to convert a 4.5v 25w dc fan from an air mattress pump to run off a rechargeable battery pack made with 18650's. This is going to be charged and ...
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2answers
106 views

On off button for my microcontroller board

Here is my charger unit and voltage regulator for powering a MCU board that I designed. I'd like to ask, how can I add an on/off button which allow charging the batteries even we turn off the system ...
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2answers
16k views

Understanding LiPo charging / protection circuit

I'm in the process of learning to design PCBs and understanding electronics design. For a project, I need to charge a 3.7V LiPo battery. I also want to protect it from over‑charging / over‑...
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1answer
29 views

Combining two power outs along with voltage regulator

I have two seperate solar panels with exact same circuitry connections. This is what I have: Solar panel -> Sparkfun Buck boost converter (set on 5v) -> TP4056 -> single 18650 AND + and - Power out ...
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3answers
69 views

Can I use a current control buck converter to charge a battery?

As shown below, could I use a microcontroller to charge the Li-ion battery? I'm unsure if I'll run into issues with the voltages on the ADC. I've done this exact setup before with a generic load, I'm ...
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1answer
3k views

Remove over-current protection of battery protection circuit

I have a hardware that is powered by a standard polymer battery (http://www.ebay.com/itm/3-7V-Polymer-Rechargeable-Battery-2000mAh-PCM-103450-for-GPS-ipod-Tablet-PC-MP3-/262605237924). The hardware ...
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3answers
2k views

Li-ion battery life after being 'completely' discharged

If the voltage of a lithium-ion cell drops below a certain level, it's ruined. Lithium-ion batteries age. [Source] As an owner of quite a lot of expensive mobile devices (lots of Apple stuff for ...
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1answer
41 views

12 V / 140 Ah lead acid battery charging with 24 V / 150 A alternator

Can I connect two 12 V / 140 Ah lead acid batteries in series to get 24 V / 140 Ah and connect directly to a 24 V/ 150 A alternator to charge them? Or do I need any charging / protection circuit in ...
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1answer
55 views

Lithium Ion Battery Charger and Power Path Management IC

I am to analog electronics. I am building a circuit that has a lithium ion battery. I understand the importance battery charger in battery management. My question is how does a designer set ...
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2answers
4k views

Can I safely trickle charge a 24v garage actuator battery with a pair of 12v solar panels?

I have a Hormann Promatic Akku Garage door actuator, since my garage doesn't have mains electricity. Generally speaking I'm very impressed with how well it works. Unfortunately while it lasts around ...
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1answer
56 views

Help Identifying Parts of a Battery Management Board

I am currently way over my head in a personal project to design and create a 5 cell battery protection system. I'm fairly confident that I've correctly cloned the cell balancing section (section C) of ...
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3answers
166 views

How can I trickle charge NiMH batteries as part of an IOT controller?

I have built an IOT motor controller board that's powered by 4 AA NiMH batteries in series. I want to use a solar panel to trickle charge the batteries, but the voltage slowly decreases even when the ...
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1answer
101 views

Charging part reccomendations

Ive started a project that I think has become over my head. But now that im into it I'm determined to learn what I can. This started as a 5v project but has become a 9v one. This project is to be ...
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1answer
173 views

How to keep a small Li-Ion battery on float for backup service?

I have a number of small electronic widgets (similar to small arduino boards) that generally draw 100uA-10mA avg with infrequent 50mA-100mA peaks (e.g. radio or cellular TX) and for some I'd like to ...
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1answer
8k views

Charging 3 cell LiPo with TP4056 (Protection included)

I am trying to charge my three LiPo cells with these TP4056 modules. My Idea: simulate this circuit – Schematic created using CircuitLab
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1answer
144 views

Boost converter voltage drop when charging battery

I made a 4s battery pack made of 18650 LiFePO4 cells that I'm planning to use for a mobile computing hobby project. My plan for charging it is to use a salvaged power supply from a computer along ...
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2answers
43 views

What is pv cut off for 100amp(12v) lead acid battery?

I have 100 A lead acid battery and it charged with solor controller charger, the charger remains on after crossing 14.4V. Is this harmful for battery life? If it is dangerous, what is PV cut to charge ...
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1answer
156 views

Limiting 14V current to 50A [closed]

Given multiple possible powerful charge sources without adequate over-current protection, and a very large (say 500 AH) depleted battery bank, using a very low resistance / high acceptance rate ...
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4answers
58k views

Voltage input for charging NiMH Batteries

I have 12 AAA NiMH batteries(1000mAH and 1.2V per battery) and I want to know what is the optimum voltage for charging them. I am using a simple Constant Current charger(LM317 and 68 Ohm Resistor(R in ...
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1answer
31 views

How does an optimized car battery charging system could be designed?

To start, I saw a scooter electrics. In that implementation, after quite a weak (in my sense) generator it has some shunt linear regulator, that just dissipates overvoltage to heat. Oh god! Weak ...
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0answers
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
121 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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0answers
54 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
318 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 ...