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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82 views

Charging 4 x 12V lead acid battery with solar in series or parallel?

I have a small electric vehicle that currently uses 4 x 12V 8Ah SLA batteries wired in series as its 48V battery packs. I have 2 of these packs. In order to charge the batteries, I unplug all of them,...
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32 views

If I am discharging a battery at 30% of its energy and then charging it at 0.8C. How long will it take to be completely charged?

Suppose that I have a lead acid battery that: Can (and will) be discharged by using 70% of its energy (energy left is 30%) When the battery is at 30%, I will recharge it at 0.8C. How long will the ...
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392 views

Why does my 12V SLA Battery behave strangely when charged by simple LM317 circuit?

I'm currently working on a DIY alarm circuit and I have need of a charge controller for a 12V SLA battery. I picked up a XH-M603 charge controller (https://www.banggood.com/XH-M603-DC-12-24V-Charging-...
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65 views

Arcing contacts corrupt communication. What to do?

I have a robot with external charging contacts and a docking station with exposed pads this robot has to drive into to start charging. When trying to dock and charge I seem to get a lot GND bounce, ...
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101 views

Using BMS in serial with parallel charging

Is it possible to connect two 4.2V 18650 Li-ion batteries in series but have them charged in parallel with 5V Usb wall charger? I have HX-1S-3576 as BMS. If i use 4 of these BMS as shown in the ...
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2answers
256 views

USB and LiPo power supply with charger

I'm having trouble designing a power supply circuit for a small microcontroller-based project. The board I'm building will be powered by a 3.7V LiPo battery most of the time, but it could also be ...
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23 views

Charging and monitoring LiPo battery on docking station

How can I charge a LiPo battery (4 cells) without the "classical Lipo Balance Charger". Also, is it possible to monitor the battery level from, let's say a Raspberry Pi?(Using the 4 pins that are ...
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77 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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37 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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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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221 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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127 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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87 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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1answer
976 views

24v output from two 12v batteries in series, charge them with 12 volts in parallel

I have a solar charge controller which can charge 12volts batteries. I have two 12 volt batteries which are connected in parallel. I need to have 24volts output without using dc-dc step up converters. ...
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98 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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2answers
47 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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35 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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36 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
74 views

12V - How to activate an electric item if battery is full

I have a solar system 12V connected to a PWM controller 20A and a lead-acid battery 80Ah deep cycle. What kind of setup should I make to activate a pump (12V) if the battery is full ( >13.8V ) ?
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60 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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2answers
96 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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1answer
448 views

CN3722 charging issue

I'm using CN3722 for 2 cell battery charging. I have two way supply, it gets power from Solar as well as DC 12V whichever is available. The MPPT is set at 11V. Solar panel maximum goes to 21V. I ...
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464 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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1answer
406 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 ...
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1answer
47 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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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 ...
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3answers
122 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
93 views

Battery charging over USB-C (using USB-PD?)

I'm designing my first PCB, a wireless Keypad/Macropad with a battery. I'm probably going to be using a 2Ah Li-Ion battery because there will be a lot of LEDs on it and I just want it to last longer ...
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1answer
47 views

MP26029 Battery Charging IC OTP issue

I am working on this battery charging IC MP26029, it has OTP Funtion (One Time Programmable). But i do not know how to program this IC, as there are no Uart or I2C pins available. Does any one know ...
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48 views

Problem with MAX1645B test circuit?

Please consider the schematic: The MAX1645B is a level 2 battery charger. My problem is with the P-Channel MOSFETs. There are two P-Channel MOSFETs in the above circuit. From the datasheet: ...
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1answer
178 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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37 views

Charging Phone with a Modified Power Supply [duplicate]

I have converted a computer power supply into bench top power supply and I am now ready to add some USB ports to charge various devices. On the power supply label it shows the 5v rail is capable of ...
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57 views

Minimum current to charge a 5v device? [duplicate]

I'm trying to use a DC-DC converter to charge a mobile phone. This is the converter....TRACO 12v-5v converter The converter is relatively low power, (5w) and can supply a maximum of 1amp. Testing ...
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104 views

AC water turbine

I am trying to use a water turbine from China to charge a lithium ion battery. The water turbine is rated to 10 watts. I figured that should be enough to charge the battery but I can only ever get ...
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1answer
107 views

1S or 2S li-ion battery charging design for ESP32/Nextion device

I am designing a portable battery powered device and trying to decide on my battery configuration. It will use an ESP32 chip with a few additional ICs, which will draw about as much current as an ...
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338 views

Overvoltage Protection for Battery Charger

I'm trying to come up with some form of precise overvoltage protection between battery chargers and batteries between 12V and 48V batteries. I have 12 and 24 sorted using different methods: crowbar ...
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134 views

How does recuperation works in BLDC?

Using BLDC wheels is common on electric transport. A wheel is a multiphase motor, where each phase(coil) is separated from power source(battery) with some kind of transistor, driven by PWM-like signal....
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1answer
225 views

How to make a battery level indicator for arduino (The battery is powering the arduino also) [duplicate]

Hi I am building a pocket altitude, temperature and humidity meter with 1.8" TFT display. I have a 1000mah 3.3v Li-ion battery to power the whole system. I also need to display the battery level in ...
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1answer
149 views

Low current LiFePO4 battery charging

I have a portable solar panel capable of delivering 21W at 5V. I would like to be able to charge my 12V LiFePO4 battery with this panel. My AC-powered charge controller is rated at 14.4V 4A which I ...
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87 views

Charging Voltage of Lead Acid Batteries

I recently installed a solar ups and it has been charging the batteries all the time. I have two 12v 230ah Batteries (lead acid tubular) in series and my solar charger software says that it is ...
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1answer
294 views

Newbie question about BMS boards and 18650 cells

I would like to replace/convert some old (non working) 18v Nicad power tool batteries to use 18650s instead. I've got some brand new 18650s and some 5s battery management system boards, but as a non-...
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87 views

is it OK to use battery while charging? [duplicate]

I am using the tp4056 module with protection to charge NCR18650 li-ion battery. is it OK to connect to the load to the battery while it is charging? I am using a booster to boost 3.7V to 9V(load ...
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2answers
96 views

Battery charger fundamentals

I am new to field of charger designing but I have to complete one project of battery charger for 48 V 20 Ah Lithium-ion battery having 5 A max charging current. The previous person had done work of ...
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43 views

Li-ion cell voltage balancing issue while charging

I have a two cell li-ion battery which has specifications of 7.4v, 2200mAH. I used one cell (3.7v, 2200mAH) for a required project. I discharged it and then reconfigured in to series(7.4v, 2200mAH) ...
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26 views

LiPo-management and alarm-clock sharing on same MCU

I am working on a wake-up light alarm clock project using a small 3.7V LiPo battery (5V USB charger). I am considering using a microcontroller to do the alarm clock function rather than a dedicated ...
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47 views

20A 12V Load for lithium battery cycling tests - Car Battery + DC power supply with diode?

Ok I have searched, can't find anything. I have a high capacity lithium ion battery testing rig, and I have some iCharger 406 units that are doing the testing for me. That side works awesome, and I ...
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2answers
76 views

DC Barrel - Powering a battery pack

I am looking for a DC barrel to power a battery pack. The battery in question is connected in 10S3P, that's is a nominal voltage of 36V. I am currently looking for a DC barrel that can withstand at ...
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181 views

Allowable ripple current οf battery charger

The ripple of the charging current is pretty important for the aging of an electric battery. So, the current ripple should be as less as possible. In order to reduce the current ripple, we have to use ...
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402 views

Battery float voltage of CN3722

I want to charge a 2-cell Li-ion battery with CN3722 charging IC. According to my circuit design, the float voltage at the battery terminal should be 8.4V. But, the float voltage is measured as 13.44V ...
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1answer
239 views

Simple Li Ion integrated Charger and balancer

I am currently working on a project, which should contain a Li-Ion battery pack in the form of 8 18650 cells in 4S2P. The main consumers of the build are a class D amplifier and a single board ...

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