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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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2answers
72 views

how many amps would a 12 v -20 ahr battery draw when charged with unlimited current power supply?

i have 3 X 12V battery i use them to drive a dirt bike .i want to charge them with a 36v-30A power supply the maximum charge current is 6 amps that is given by the manufacturer . will this damage my ...
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votes
1answer
50 views

Charging Lithium ion battery with a modified charger

I've a defective charger for a small LED torch light, its output is 4.2V / 500mA. I may not find an alternative one, so I'm considering modifying a mobile phone charger as following: The mobile ...
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votes
1answer
34 views

Power management problem on Samsung SI9000? [closed]

I have a Samsung SI9000 model SPH-D710 Sprint version. The issue I am having is the phone seems to not be charging the battery. Currently the battery is fully discharged and when plugged in and ...
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2answers
289 views

Does wireless charging degrade battery life? [closed]

Does a design using wireless charging such as QI effect the longevity/health of lithium-ion batteries such as those found in modern consumer electronics devices? What special considerations must be ...
0
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1answer
48 views

I have a 9v battery that is only needed to output power during night time/when the sun is down, how can i do this?

My main question is, am I able to use a solar panel to only allow power flow when it is dark outside?/When the Solar panel isn't receiving any light? What would the circuit for that look like? In the ...
-1
votes
2answers
561 views

Hiw to build UPS using TP4056 and 18650 Batteries? [duplicate]

I have build this UPS battery supply to power a Raspberry Pi using 18650 batteries,using the TP4056 battery charge controller. The circuit as follows: This is working fine at the moment, but I'm ...
0
votes
1answer
48 views

Does charging near maximum C rate have the same effect as high battery levels?

We know: The maximum C-rate decreases with the increasing charging state. Let's assume an 2 Ah Lithium-Ion or Lithium-Polymer mobile phone battery. (2 Ah is considered tiny in 2018, but this is just ...
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3answers
3k views

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

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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1answer
107 views

Solar Power with Battery Backup Circuit

As a disclaimer, I'm a novice when it comes to electrical engineering and I am looking for assistance in order to complete my endeavor. I have spent the past few weeks teaching myself concepts and ...
0
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1answer
50 views

Charging and Using a Lithium Battery

I’m using an Adafruit micro-USB Charger connected to a standard 850mAh LiPo battery. I would like to know if it’s safe to charge the battery while also using it. The circuit that the BATT and GND pins ...
1
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1answer
75 views

In Charging Circuit with battery detection

The circuit is charging the battery with Vcharge and VCharge also power up the circuit operation. Battery will serve to power the circuit when main power supply VCharge cut off. A switch is added to ...
0
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1answer
109 views

charging lithium ion battery of 3.7v

I have a device in which I have used 3.7v of the lithium-ion battery for power supply and for charging this battery, I am using a tp4056 module. when I connect a battery to tp4056, battery fully ...
0
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1answer
113 views

Can I use a car battery as input for a solar charging controller? [closed]

I have the following setup 30W 12V solar panel connected to 260W solar charging controller connected to 12V 7Ah AGM battery I would now like to use my 60Ah car battery to charge the 7Ah AGM battery....
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0answers
103 views

BQ24133, unable to charge the battery

I have designed the circuit around BQ24133 and in my humble opinion, chose the right components while following the datasheet. I had the PCB made, soldered the components and started testing. The next ...
0
votes
1answer
32 views

Adafruit USB LiIon/LiPoly charger - v1.2, charging multiple batteries with series output WITHOUT switch?

On their documentation page, Adafruit offer a tutorial for using it with 2s li-ions. However that also required a 3pdt switch, which would have to be manually thrown. Since in my project I will not ...
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2answers
388 views

Mobile Home battery charger transformer

I need some help regarding the transformer in the battery charger unit. The lightning struck my house, and sadly the mobile home was connected to 230V outlet. Among other things that needed to be ...
-1
votes
1answer
216 views

Power bank charging using a solar panel

I'm trying to charge a power bank of 5V, 5000mAh, using a solar panel 6V, 14W. I have made the connection from the solar panel to a DC-DC convertor (specification: 3-37V, 3A) which steps down to a ...
-2
votes
1answer
113 views

How can I make a battery pack with 6 18650 Li-ion that is USB rechargeable?

I'm new to electronics and DIY stuf but I wanted to make a Bluetooth speaker and there for I need a battery pack. I looked up a lot of information on the internet but couldn't find how I could ...
1
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2answers
132 views

Why is it recommended to not use a device while charging? How does it harm the battery or the device?

I was planning on getting the new VR headset from Oculus, dubbed Oculus GO. The battery life of that thing is roughly 3 hours max. So, during long VR sessions, powering the headset via a power bank ...
0
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2answers
94 views

Safety of Using USB Charger [closed]

I am looking at getting a 3 port USB wall charger, to save having so many individual ones plugged in. A lot that I've seen offer Qualcomm FastCharge, and other similar things, which are around 2.4A, ...
0
votes
2answers
333 views

Why is neutral required in three phase charging of Electric vehicles?

Talking about both three-phase AC as well as DC fast charging (wherein 3 phase AC is converted to DC) in EVs, I think that the 3-phase rectifier represents a balanced 'load'. Therefore I want to know ...
1
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2answers
110 views

Is it safe to connect a small solar panel to a lead acid with only a diode?

Is my setup safe? I'm connecting two 7.2v 100ma solar panels in parallel using two 1N5817 then to a to 6v lead acid battery with a Constant Voltage Charge of 7.3-7.4v for cycle use.I can't use a MPPT ...
0
votes
1answer
90 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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votes
1answer
69 views

How much current should I pass through battery to break through sulphate deposits?

I recovered an aged SLA from the pile dated 2003 marked 6V 4.5AH. It has .97V in it. As I recollect, thumb rule for a charging current would be about 500mA at 7V or better. A breadboarded LM317 may ...
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votes
2answers
121 views

How much energy is required to charge a battery to 50% vs 100%?

When I go hiking, I only recharge my phone to about 80% from my backup supply because I know it gets harder and harder to push more energy into a battery the closer it gets to full capacity. So I am ...
0
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2answers
42 views

Drawing DC current from batteries on charge controller

I have an off-grid solar system where this inverter/charge controller (ICC) is connected to a 48V battery (which is in fact 2 parallel quartets of 12V batteries, but this is non-relevant detail I ...
0
votes
2answers
252 views

Charging a 4000mAh Li ion battery using multiple TP4056 ICs

As single TP4056 IC rated current is 1A,so I was thinking to connect multiple TP4056 ICs in parallel, such that enough current can be sourced to charge the li-ion battery(400mAh) connected. Here is ...
1
vote
1answer
82 views

Powering module directly from LiPo Charger with LiPo connected

I have a GSM module (Particle Electron) which has pins for powering it from a LiPo battery. The pins accept voltages from 3.6V to 4.4V. The module can also be powered from 5V supply through another ...
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votes
2answers
52 views

What determines the current drawn by phone battery? Phone (load) or charger or both? [closed]

What actually determines the current drawn by phone battery? Is it the phone battery (load) or the charger (supply)? For instance, the charger that came with my phone reads 1.5 A. Also, I have two ...
0
votes
1answer
141 views

MCP73833 and status to RaspberryPi

I want to use MCP73833 as a charger IC with the ability to route STAT1, STAT2, PG to RaspberryPi GPIO. Those are open-drain outputs and should be pull-up, according to datasheet. The datasheet also ...
0
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1answer
263 views

Is it possible to charge 18650 battery using 1.5A?

Hi everyone I got four 3400 mAh 18650 batteries (specs see the pics) can I charge them use the charger that's 1.5A*4 output (charger specs also see the pic)? The charge time will be 3400/1500=2.26 ...
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1answer
199 views

3.7V battery charger analyse

I have extract this schematic from youtube (only charger parts) and create this on falstad because I want to create 3.7V battery charger. The original charger use 1N4007 diode with BC547 transistor. I ...
1
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1answer
49 views

Calculation of 3-phase power in Electric Vehicle Charging

I have a doubt regarding calculation of 3-phase power in EV charging. On the last page of the pdf in the link given below, the power calculation is done as 3 x 230V x 16A = 22kW. http://www3.fronius....
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0answers
36 views

Using a GE 65W Boost Converter adequate to charge a 13s6p Lion BMS

I have a 13s6p Lion array with BMS I want to charge from a 12v source. This is the Arduino Lion charger project I am attempting After letting the smoke out of an undocumented Chinese boost converter,...
0
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1answer
641 views

If I have two 18650 Li-ion batteries with different capacities, can I charge them using the same circuit?

I have several 18650 Li-Ion batteries, many with different capacities. Can I charge them with the same charging circuit (5 to 3.7 V 1 A buck converter)? Can I put them in parallel and use the same ...
0
votes
1answer
149 views

What part of a mobile phone charger makes it safe to be charged with opposites polarity? [closed]

A mobile phone charger works regardless of whether the charger is the right side up or upside down. As I know, batteries should not be charged with wrong polarity. How do those chargers accomplish ...
1
vote
1answer
34 views

Can a sealed lead acid battery charger work properly with a flooded / wet cell deep cycle battery

I know that charging sealed / AGM / gel cell lead acid batteries requires a special charger so they don’t get overcharged, overheated, boiled out, and destroyed. Is it safe to use this special type ...
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votes
2answers
48 views

Lithium-Ion - leave at full or charge and discharge [closed]

I am getting a laptop soon, and am wondering if I should leave the Li-ion battery at full during use, or have it charge and discharge within a range of, say, 40-80%. The goal here is maximum battery ...
2
votes
1answer
177 views

Always on lifepo4 power supply - will this circuit work?

I'm building a music box based on a Raspberry Pi and a HifiBerry AMP2 amp. The amp unit takes 12-24V DC and supplies the Pi with 5V. I want to be able to power the amp/Pi by either a mains adapter (...
0
votes
0answers
382 views

Power factor and Harmonics associated with Electric Vehicle charging

What is the power factor associated with (typical) DC fast chargers and onboard chargers in electrical vehicles? Also, how much is the harmonic content (especially triple-N harmonics) associated with ...
0
votes
1answer
53 views

Li-Ion Battery Charging Board Temprature (Junction Temp)

I'm looking for a little help with a simple battery charging project. I've bought a pack of cheap USB charging boards on ebay (link) with the intent of using one to charge a small Li-Ion battery. ...
3
votes
2answers
116 views

Can I replace a NIMH rechargeable pack with a resistor if I only want to run plugged in?

My kids have a pair of IKEA night lights ("spoka") where the internal battery packs have died. I'm debating replacing the batteries (3x AAA NIMH, marked 3.6V so in series) and have looked at this ...
2
votes
3answers
150 views

How to estimate Li Ion Battery SOC?

In a simple model of a renewable energy system, I have a residential inverer and Lithium ion battery system with a round-trip efficiency (for inverter and battery, i.e. ac to ac) of 89% (at 25 degrees ...
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votes
2answers
63 views

Electric Vehicle Charging [closed]

I have a few queries related to EV charging: (1) When we refer to 'X kW' charger, is it that the charger is taking in X kW power and delivering power = X kW times the efficiency of the charger to the ...
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votes
1answer
864 views

Replacement of li po battery with li ion battery [duplicate]

Is it possible to replace a battery for headphones? I would like to replace a 052030 li po battery with a Nokia BL-5C Lithium Ion battery. The li po battery is rated at 130 mAh with 3.7v. The Lithium ...
-1
votes
1answer
203 views

Could I replace headphones NIMH battery with Lithium Ion phone battery of the same voltage?

Is it possible to replace a battery for headphones? I would like to replace a 052030 li po battery with a Nokia BL-5C Lithium Ion battery. The li po battery is rated at 130 mAh with 3.7v. The Lithium ...
0
votes
1answer
914 views

Laptop battery and adapter voltage ratings

Considering a 4-cell (laptop) lithium-ion battery, the cell voltages add (since they are in series) to 3.7 V * 4 = 14.8 V. However, the adapter says that it has a 19.5 V DC output. I want to know why ...
2
votes
2answers
69 views

How to test a Lithium-Ion charging IC?

I'm using an LTC4155 (datasheet) in one of my USB-based circuits to charge an on-board Lithium-Ion battery. I'm aware of the nitty-gritty details when it comes to selecting charging current, matching ...
0
votes
1answer
48 views

Understanding Battery discharge rating

Please find the attached image showing amaron quanta 12 V 100 Ah VRLA battery discharge chart at constant current rating. I am bit confused that how should I calculate the battery capacity based on ...
0
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1answer
146 views

Parallel lipo batteries with mcp73831 charger IC

After reading this very informative blog about load sharing while charging batteries, I'm planning on using an MCP73831 in the same configuration as detailed by the blog for use in a project I'm ...