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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
137 views

How to connect 2 thermistors for battery protection?

I'm planning to use BQ24100 for charging Li-ion cells connected in parallel. Unfortunately, the cells have to be separated by few centimeters, so I have to use 2 thermistors. So, how to connect 2 ...
-1
votes
1answer
30 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 ...
-2
votes
0answers
21 views

Possible to make an inductive charger that operates on the front of a phone?

My wife uses a bulky phone case that prevents inductive chargers from working. Would it be possible to manufacture a charging coil that had the opposite "polarity", so you could lay a phone face ...
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votes
2answers
34 views

My portable charger with more capacity than my phone battery does not charge it fully

I have a portable charger with a 3260 mAh capacity while my phone only has a 3000 mAh battery. However, my charger can never fully charge my phone. It only ever gets my phone to around 75-80 percent ...
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0answers
20 views

How Fast / VOOC / Dash charging works? [closed]

A battery can be modelled as Equivalent series resistance. So Battery connected to a charger is similar to a resistor connected to a voltage source which draws constant current. Will the type of ...
0
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0answers
29 views

Laptop battery SMBus broadcasting

I connected a laptop battery connector to a micro-controller through SMBus. I can read information from battery such as state of charge. I listen to the battery broadcasting charging current and ...
22
votes
8answers
36k 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
votes
0answers
30 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
29 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 ...
-1
votes
0answers
15 views

LG G6 Phone will sometimes charge ONLY using powerblock? [on hold]

About once every six weeks my LG G6 throws a wobbler. The phone will not charge up using its mains adaptor. The only way to get a charge into is by using an Anker power block. Then it charges up fine....
0
votes
1answer
14 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 ...
-2
votes
1answer
47 views

How can i calculate the life of a battery while it is also currently being charged by a solar panel? [on hold]

Presuming the battery is using more power than what the panel can produce? 3716 mAh battery Consumption of 250 mA with a rate of 0.7 While I can use this to calculate the battery life, how would I do ...
0
votes
3answers
24 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
169 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 ...
-1
votes
1answer
269 views

How much current to charge 4S2P LiIon? [on hold]

I have a 4S2P Lithium-ion battery for my quadcopter. I'm charging it with the Imax B6. I would like to ask what would be the suggested charging current for the battery pack with the 4S2P setup? Thanks!...
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votes
0answers
23 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
votes
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 ...
-1
votes
0answers
36 views

Solar Charged-18650 Battery Bank in parallel with TP4056 modules

for my off-grid project I plan to power an Arduino system using 5.5V 4W panels (placeholder, may source larger panels with same voltage for winter months) and Lithium cells for night operation (...
0
votes
1answer
69 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
84 views

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

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
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0answers
34 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
388 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 ...
0
votes
1answer
61 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 ...
-1
votes
1answer
28 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
29 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?
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votes
0answers
13 views

What do I need to run a XT30 Parallel Charging Board [on hold]

So currently I have an Eachine Wizard X220, I have 5 1500 mAh 11.1v 3s batteries and I have a charger (similar, not exact) Currently, I can only fly every other day because it takes so long to ...
2
votes
1answer
62 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
26 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
49 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
83 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 ...
-3
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
100 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
840 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
1answer
1k 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 ...
0
votes
1answer
38 views

MPPT lead acid over voltage

As I understand it, an MPPT algorithm adjusts the charging voltage until it finds the point where maximum power is delivered into the battery. If a 12V lead-acid battery is used, is there an upper ...
0
votes
3answers
122 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
36 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
18 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
563 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
42 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
539 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
23 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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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
50 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) ...
3
votes
1answer
700 views

Many questions about charging a lead acid battery

Well, I have a 12V 9AH SLA Battery, and I use a 7815 + a diode in series to charge it, (I really wanted to build a charger using the L200 or the LM317 but I couldn't find any of those in my city). So, ...