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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).

0
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1answer
61 views

BQ2002 NiMH Charging Circuit not working

I have the following charging circuit based on the BQ2002 which will charge a NiMH battery using a 5V micro USB cable. I built the circuit already and noticed that the TIP32C is not getting hot and ...
23
votes
8answers
37k views

How do USB charging and “smart” charging ports (e.g. Anker's PowerIQ) work?

Software engineer with a hobbyist understanding of EE here. I've noticed lately lots of claims from producers of USB battery packs that their ports are "smart" and "identify the device" to "deliver ...
0
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0answers
33 views

BMS for 12v Lithum battery pack

i am making a 18650 battery pack with a configuration of 4x3cells for 12v. i am using these cells, https://liionwholesale.com/products/samsung-inr18650-25r-battery-genuine-tested-20a-2500mah-flat-top-...
-1
votes
1answer
31 views

Using a 7.4 V LiPo Battery for an Arduino Feather 32u4

I am working on an Arduino project at the moment, with the following board: Adafruit Feather 32u4 And it says I need 3.7 V of LiPo to power it. However I also have a valve that I want to open and ...
0
votes
1answer
17 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 ...
0
votes
3answers
28 views

Balanced Charging of ZOP 2s lithium ion battery

Good day everyone, I recently purchased a “ZOP Power 7.4V 2200mAh 2S 35C Lipo Battery T Plug” for a project. I have designed a circuit to charge the battery, but now I am wondering if it is necessary ...
0
votes
1answer
172 views

Keithley 2450 Charge/Discharge adjusting appropiate V and I

I'm using Keithley 2450 model for charging/discharging battery. My aim is to find charge/discharge characteristics of 100mAH 9V battery. In the following link, they have described discharge ...
0
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0answers
24 views

Charging multiple batterypacks in parallel

I am sorry if this questions seems kinda basic. I am currently working on a small project involving a bluetooth amplifier module requiring a minimum of 12v input. My idea was to use a ...
0
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1answer
71 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 ...
-2
votes
1answer
41 views

DC-DC charging different voltages

I have several banks of batteries on a boat, two larger banks 48v electric propulsion system with regen 12v house bank Each has a charging source the 48 has regen up to 2kw while sailing The 12 has ...
0
votes
1answer
74 views

Switching between two completely independent circuits

Background: I have built a 2S 7.4V battery out of two 18650 batteries. I have some TP4056 (5V 1A Micro-USB) charging modules lying around. I would like to use these the TP4056 modules (one per 18650) ...
1
vote
1answer
86 views

Why does my phone pull less current from power bank when the screen is on? [closed]

While charging my phone (a Samsung Galaxy S5) with a power bank that displays the power output with 0.1 W resolution, I turned the screen on. To my surprise, the power pulled by the phone went from 7....
0
votes
0answers
40 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: ...
0
votes
1answer
411 views

Battery charging circuit using 12V dc generator

This is a project work of power generation from speed breaker.I am using an IBL-100SW dc motor in my project as a generator to produce power.I am getting a voltage from 3V to 18V and current of 0.1mA ...
-1
votes
1answer
33 views

How should a load be connected in a configuration of a MPPT solar charger and a LiPo battery?

I am designing a circuit for MPPT solar charger SPV1040 which could charge a single-cell LiPo battery. I am using AN3319 and AN4050 application notes for reference. I also want to connect a load ...
0
votes
1answer
32 views

PV battery connection

1)What happen if a PV array of 30 Vmp is connected to a 12 volt battery(lead acid)? 2)Do i need a buck converter to 12 volt between the pv array and the battery to connect them together?
2
votes
1answer
65 views

How do integrated charger ICs dissipate differences in VCC and the battery voltage?

I was looking at a couple of charging ICs (BQ2002 for instance) and some of the fast charger ICs can charge up to 2A whilst running of a 5v supply. In this case charging a empty 1v NiMH cell means ...
0
votes
1answer
27 views

li-ion battery managment system, cell protection difference?

Could you help me to clear up what the battery management system/BMS adds to cell level protection, what is the difference? I assume that if I have many cells in series if I only have cell protection ...
1
vote
2answers
54 views

Replace 3.7V flat tablet battery with a 18650 cell

I am building a device using cheap Chinese tablet. One of the problems I have is weak built-in battery. I'd like to replace it with a few 18650 cells. As far as I know, 18650 cell can be charged up ...
0
votes
0answers
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 ...
1
vote
2answers
86 views

Buck converter for Li-Ion 2s battery charger

I'm currently doing a project that requires the charging of a 2s Li-Ion battery. I have an 18V 10W solar panel that I want to charge my battery using a buck converter. Im controlling the switch and ...
-2
votes
1answer
5k views

Can 1.5v Lithium AA batteries be recharged?

I hope this is the best place for this question. I have some Energizer lithium AA batteries (1.5v), that work very nicely in electronics that have heavy constant usage, such as my Apple Magic ...
2
votes
1answer
2k views

Connecting multiple batteries to a battery tender / trickle charger

I have multiple 12V batteries, some small ATV starter batteries (12Ah and 9Ah) and some deep cycle (120Ah and 97Ah). Can I connect all those batteries to the same battery tender in parallel? Could I ...
0
votes
0answers
102 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 ...
0
votes
0answers
55 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 ...
4
votes
1answer
864 views

MCP73833 power path problem

I'm having trouble with MCP73833. It's 1S lipo charger powered from USB. I followed this figure from application note: My schematic: Battery connectors are X4 and X5, load is connected, USB is ...
0
votes
3answers
123 views

Why doesn't the voltage drop across the resistors of my battery charger follow Ohm's law?

Here's the setup, the three items below are in series: Battery at 215V Power supply at 250V (It is a 5A constant current power supply that will drop voltage down to 200V minimum before failing) 8 ...
0
votes
0answers
37 views

Two solar panels with separate battery or one panel with one battery?

I have already bought a 12 V 40 W solar panel. Its controller is also on the way. I will be using it to charge a lithium ion battery pack of 12 V 13 Ah. The charge controller ...
0
votes
0answers
20 views

LiPo ballancing circuit

I'm designing a circuit board to which I'll be able to connect multiple LiPo batteries (2-6S) and charge them in parallel without bothering user about balancing those packs firstly. So the charging ...
2
votes
1answer
569 views

Li-ion battery calibration technique

As you know the li-ion batteries have flat voltage curve and it is not possible to detect battery state of charge (SOC) from voltage accurately. We use fual-guage which measures the accumulated charge....
3
votes
0answers
45 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 ...
1
vote
1answer
591 views

How long to wait between usage and charging of a LiPo (or Li-Ion)

Introduction Like the most of us I've used Li-Ion batteries in many everyday devices. I also use a few LiPo Batteries in RC-airplanes. In the last years I read about their correct usage and charging. ...
0
votes
1answer
27 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 ...
-1
votes
2answers
2k views

Calculate battery state of charge percentage

What is the correct formula to calculate battery state of charge percentage based on the battery type (12v, 24v, 48v and so on) and the current battery voltage. For example if I have a 12v battery ...
1
vote
1answer
60 views

How to combine a charger for LIPO battery with a boost step-up voltage converter?

I want to power a device with up to 4A at 5V from a single-cell LIPO battery of 3.7V 5000mAh and be able to charge it. The idea is to have everything packed up inside a case, so I don't want to rely ...
2
votes
1answer
77 views

Should I be conservative about setting the output voltage of the CV phase of Li-Ion charging

Background My application features a Li-Ion battery (NCR18650B) which I'm charging with the standard CC/CV method. Various constraints force me to use a generic buck converter (with current limiter) ...
-6
votes
2answers
112 views

Which resistors to use for high current (10A) voltage-divider? [closed]

I'm having a problem determining resistor specs (especially wattage) for my voltage divider circuit [ 27 V to 17.5 \$+-\$ 0.5 V ] on 10 ampere DC supply. I have an AC (220V 50Hz) to DC (27V 10A) ...
8
votes
7answers
37k views

How do I design a 2A or more power supply for my consumer USB devices?

I understand that many of my consumer devices charged by USB ports can charge at higher rates than 0.5A. However, in testing, I've found they don't consume more than this. Test Setup I have a power ...
0
votes
0answers
98 views

Charger for lead-calcium battery circuit

I post it because i want to know if anyone of you see any rare in this circuit made in proteus 8.6, i accept any observation, this circuit provide 12v of output and 3 modes of charging fast(15 A), ...
0
votes
1answer
366 views

MOSFET switch between parallel batteries for dual charging

UPDATED: I am developing a wireless device composed of : 2 Varta CP 1654 A3 Li-Ion 3.7V 120mAh (supporting 2C charge) with protection circuit module 2 MCUs that can handle Li-ion CC/CV charging My ...
0
votes
0answers
59 views

clamping the battery voltage with zener diode?

I want to do an experiment with a battery I have. I have 200AH 6v lead acid battery and I want to charge it with maximum current the battery can take in bulk stage, then in float or acp. stages, I ...
0
votes
1answer
50 views

Can this portable power generator charge this battery? [closed]

I am considering purchasing an e-bike but I have no outlets at my parking space and it's a non-removable battery. The e-bike looks like a motorcycle. I am considering getting one of those portable ...
1
vote
2answers
888 views

Do I need to fuse batteries in parallel?

I have two deep cycle batteries in my Airstream, in the panel there is a fused bus bar (that appears to be faulty) so the solar panels only charge the one battery. Can I just run a heavy gauge wire ...
-2
votes
1answer
61 views

Does the drive train of an EV affect the charging speed of the battery? Why? [closed]

In the latest tesla announcement they said: “Paired with the new more efficient drivetrain design, Model S and Model X are now capable of achieving 200 kW on V3 Superchargers and 145 kW on V2 ...
3
votes
2answers
3k views

Solar and battery for small usb camera

As the title suggests, I'd like to power a Dropcam without laying new wire in our community garden (code enforcement makes wiring a headache). When I wired my Raspberry Pi to work off solar power it ...
3
votes
1answer
69 views

Different Wattage Solar Panels for Home [different Voltage/Ampere]

My current solar system for home 12V 100W polycrystalline Solar Panel. 12V 75Ah Lead Acid solar tubular Battery. PWM 12V 10A Solar Charge Controller. 12V Input and 200VA Output Inverter. Current ...
2
votes
1answer
4k views

TP4056 lipo charger output voltage

for a project I'm looking for a charging solution to charge a lipo battery, while at the same time being able to power a microcontroller with 3.3v. For that purpose, I bought a few TP4056 boards that ...
0
votes
1answer
672 views

BMS for Li-Po with balancing and protection

I want to build a robot based on Raspberry Pi with Raspberry Camera. It will use tracked car chassis to move around my flat. I'd decided to use 3-cells Li-Po battery to power this robot (because of ...
0
votes
1answer
1k views

12V SLA Battery Charge Controller

i'm building a robot (a sort of rover) which includes a 12V/7Ah SLA battery. The robot circuit needs a regulated 12V supply to work correctly. I would like to charge my rover using a generic 14-19V ...
0
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0answers
53 views

How to switch between charge and discharge?

I want to make my rpi 3 portable with adding a rechargeable battery pack to it. I have 6 Li-ION batteries that are packed together in 2 series rows of 3 batteries in parallel(each battery is a 3.7 ...