Questions tagged [charging]

Battery and battery operated devices' charging methods and problems encountered relevant to charging.

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39 votes
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How does a USB C port provide the power to charge laptops?

I've heard about laptops such as the new Chromebooks that are charged via a wall charger that connects to a USB-C port. I'm quite happy that this will supposedly standardize laptop chargers but I'm a ...
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28 votes
6 answers
366k views

How to Calculate the time of Charging and Discharging of battery?

How do I calculate the approximated time for the Charging and Discharging of the battery? Is there any equation available for the purpose? If yes, then please provide me.
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28 votes
5 answers
8k views

Charging lead-acid batteries?

Are there any special requirements for charging lead-acid batteries?
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27 votes
8 answers
45k 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 ...
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17 votes
3 answers
2k views

What does an EV "wall socket charging cable" do?

Known as "Mode 2 charging", this method of charging electric vehicles describes the use of a common household wall socket and common mains voltage (230 v) to charge the vehicle. This is ...
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15 votes
4 answers
39k views

Using LiFePO4 battery as car battery

I've had an idea of using LiFePO4 battery as replacement for car battery, since 4 of those in series make nominal 12.8V which is very close to standard 12V voltage. And depending on the cell we can ...
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  • 165
13 votes
3 answers
6k views

Takes days to charge phone from 10W solar panel

I bought a small 10 W solar panel which is rated to deliver 570 mA at its peak, according to the specifications: Power: 10 Watt Max. Voltage: 18 Volt Max. Current (Imp) : 570 mA So I bought a step-...
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  • 511
13 votes
5 answers
12k views

What are the basics of making a rechargeable battery pack?

We have a device that runs off of a AC adapter, or a pack of 8 AA batteries. Since in normal use we use both, it would seem to make sense to have the battery pack recharge while using the AC adapter - ...
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  • 233
12 votes
5 answers
4k views

How do mobile phone chargers produce regulated voltage?

I have come across many mobile phone chargers/power supplies that produce a regulated 5 volt output but I don't see any voltage regulator or a Zener diode inside. I want to know how these power ...
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  • 323
12 votes
3 answers
20k views

How can a car battery be charged by dynamo (or is it an alternator?) at the same time it is being used by the car components?

note and question * Is it an alternator or dynamo? I am not an electrical engineer and neither have any core knowledge but, this is a simple procedure of car ...
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  • 241
11 votes
5 answers
2k views

Heat lost in ideal capacitor charging

If we use an ideal capacitor to charge another ideal capacitor, my intuition tells me no heat is generated since capacitors are just storage elements. It shouldn't consume energy. But in order to ...
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  • 337
11 votes
6 answers
6k views

Inductive Charging

I've build a small three wheel robot with an Arduino Mega to drive the thing. I'm looking to keep this bot mobile as much as I can without needing to interact with it for charging etc. For the moment ...
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11 votes
2 answers
860 views

Lead Acid AGM battery testing - Why am I testing it this way?

OK, so maybe it's not fair asking YOU why WE test something the way we do. ;) Here's the thing -- Our company uses AGM Lead acid batteries in some products. The testing methods are ancient (but so ...
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  • 3,905
11 votes
2 answers
235k views

Are AA battery and 18650 battery the same? [closed]

I have an Antex SZ004W0 wireless soldering Iron which uses three 1.5V, AA batteries, but I don't know if it supports rechargeable batteries. I know that it supports non-rechargeable battery named "...
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10 votes
4 answers
13k views

How practical would a car booster using supercapacitors be?

Currently car boosters (a portable unit charged of an outlet and then connected to the car electrical system to start a car when the car battery is dead) typically use batteries - lead-acid, Li-Ion or ...
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10 votes
3 answers
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Is there way to construct an 18650 battery pack with built-in balance charging? Or is balancing not very necessary?

This is my first post here. Err, I'm a DIY enthusiast especially in electronics. I'm actually building a portable Playstation 2 Slim with an IPS display, so that it would look like a Wii U controller....
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10 votes
7 answers
45k views

How to autoregulate a TP4056 for maximum solar power extraction

I'm using a solar panel (6V - 600mA at peak power) to charge a Li-Ion (3.7V) battery using a TP4065. The TP4065 I'm using has this configuration: Where the value of the resistor Rprog determines the ...
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  • 311
9 votes
5 answers
4k views

RC circuit understandings

I am trying to understand the principles of a RC charging / discharging circuit however I'm at loss regarding certain aspects of its operation. I have a square wave generator giving 0v to 5V levels ...
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  • 1,951
9 votes
4 answers
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Why do three series connected 1.2 V NiMH batteries read 4.16 V when charged?

I have a 7.2 V Dremel. The old battery pack was dead, so I had to replace the six rechargeable batteries inside. The originals were 1.2 V 700 mAH AA; I could only find 1.2 V 1100 mAH NiMH AA ...
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  • 281
9 votes
3 answers
51k views

Charging 12v batteries with direct connection to 20v solar panels

I want to charge a 12v Sealed Lead Acid car battery off of a solar panel (20v) and then draw about 10-20W of power from it via an inverter (the load). I'm wondering if its okay to connect it ...
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  • 191
8 votes
2 answers
69k views

directly charge a laptop battery / using laptop battery for projects

I've seen a couple similar questions, but nothing exact. I'd like to know how I can charge a laptop battery directly, meaning without the laptop. This would be a battery still intact, in good ...
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  • 199
8 votes
3 answers
50k views

Are sealed lead-acid batteries safe to use indoors?

I have a small, 12V sealed lead-acid battery. I know regular lead-acid batteries can be dangerous to use or charge indoors, due to the fumes they release and the potential for acid to leak out or ...
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8 votes
1 answer
1k views

Is this MOSFET upside down?

I'm looking at existing circuits and trying to understand them so I can design my own. Also to improve my electronics knowledge, for some reason MOSFETs have never quite sunk in for me. I came across ...
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7 votes
6 answers
58k views

Is it safe to run and charge a deep cycle battery in an enclosed space like a bedroom?

I'd like to experiment with running a small server (5.5 watts) / 85AH deep cycle battery / charged via 30 watt solar panel from my bedroom. I generally keep the window open, but want to make sure it'...
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7 votes
7 answers
30k views

Is it possible to fire a spark plug from batteries

I wanted to create a remote fired trigger for a spud gun so I can trigger it remotely. Ideally I'd like to use a spark plug to fire because it should work well for gas mixtures but the trigger is ...
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7 votes
5 answers
20k views

Do cell phone batteries contain protection circuits?

I have tens of old cell phone batteries lying around and I want to try to make use of them. I've googled around for the answer, but haven't able to come across anything consistent. LiPo batteries ...
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  • 5,784
7 votes
3 answers
18k views

Calculate charge time of a capacitor through a current limiting power supply?

Is there a formula or a way to calculate Charge time of a capacitor given that it is charged by a current limiting power supply. This would lengthen the charge time but is there a way to calculate ...
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7 votes
2 answers
2k views

How do snap-on induction charging systems not interfere with device functioning

There's a variety of snap-on wireless charging solutions on the market. For example, this one includes a charging mat and a plastic case that is put onto iPhone. I suppose the winding is in the ...
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7 votes
6 answers
21k views

What are the problems with LiFePo4 float charging? How should I charge them?

I can't find any reliable info on float charging LiFePo4 cells. It's quite clear that it's not possible to float charge Li-ion and Lipo cells, but LiFePo4 looks like quite different technology. I'm ...
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  • 81
7 votes
1 answer
4k views

What component of my phone charger produces chirps and how does it do that?

My Nokia cell phone is charged with a very lightweight compact charger similar to this AC-15 (can't find the one I actually use). While the battery is close to empty the charger works silently - just ...
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7 votes
4 answers
5k views

How do I charge a commercial lithium battery with solar cells?

I have a digital camera (Panasonic DMC-FT1) and will be going multi-day hiking with it soon. I'm looking to build a solar charger for it using something like this and strap it to my pack. Does anyone ...
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6 votes
4 answers
4k views

Why doesn't my computer USB port break when I plug in a 2A device?

For typical AC to DC power adapters, I understand that the device draws the current it needs from the adapter. If it pulls more than the adapter can supply, this can cause overheating and lead to ...
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  • 192
6 votes
4 answers
6k views

Algorithm for charging LI-PO batteries?

What is the algorithm used in charging lipo batteries? From watching my charger, I see that the amperage is close to the maximum specified (i.e. what I keyed in) at the beginning and gets smaller as ...
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6 votes
6 answers
2k views

Charging of capacitor in RC circuit

When a capacitor is charged in a first order RC circuit, it charges exponentially. I understand this behavior via equations. But can anyone explain the physical reason?
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6 votes
2 answers
4k views

How do I charge a 6V, Lead Acid, 4.5 Ah battery using a 3W solar panel?

I have a solar panel with ratings: Vmp=8.8V and Imp=0.3A Using this i have to charge a 6V Lead Acid battery whose capacity is 4500mAh. I have searched the internet a lot and tried many circuits but ...
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6 votes
3 answers
18k views

How does pulse or burp charging work?

I've been doing some research about how to fully charge a lead-acid and AGM battery. However I have some questions and need some guidelines for proper implementation. Basically I am trying to find ...
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6 votes
2 answers
1k views

Can the negative impact of mixing new and old batteries be mitigated?

Mixing old and new batteries is bad. But there are various options how they can be mixed, and I guess there are use cases in which certain ways of mixing can be justified. In my off-grid solar ...
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6 votes
1 answer
6k views

Can a phone battery be used to power Arduino or Motors

I was wondering whether it would be possible to use a rechargeable battery from an ordinary cell phone to power some electronics such as a motor shield for Arduino? Can that be done and if yes then ...
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  • 163
6 votes
2 answers
2k views

iPod Car Charger w/ Audio Out

I have been working on a circuit design that would allow me to charge my iPhone/iPod classic 120 GB from my car. I am going to use power from the back of the cigar lighter sockets and put it into this ...
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6 votes
2 answers
5k views

li-ion balancing with zener diodes

Would there be any potential problems with the below implementation of a rudimentary li-ion balancing/(overcharge protection) circuit? Would a resistor need to be in series with the zeners? simulate ...
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6 votes
2 answers
7k views

3.3V Power Failover Supply with USB Li-Ion Charger

I am currently designing a "3.3V@500mA Power Failover Supply with Integrated USB Li-Ion Charger" for a uC project. I want the circuit to draw power straight from USB power when available & switch ...
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5 votes
6 answers
19k views

How to charge Laptop Li-ion Battery cells manualy?

I have received some Li-ion batteries which were originally used in Asus A2 Laptop battery original one and I would like to know if it is possible to charge each cells independently with some device ...
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  • 165
5 votes
3 answers
549 views

About the torque-free charging operation

I and one of my friends are working on understanding the below context (paper link): The study provides an extensive overview of on-board integrated chargers for electric vehicles that are based on ...
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5 votes
3 answers
4k views

What happens if you charge a laptop using it's USB power?

To play a joke on this question, we came up with the following image on the Super User Chat. Of course this will not work, but now my question is: What happens if you charge a laptop using it's USB ...
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5 votes
2 answers
4k views

Making a lithium polymer circuit

I want to create a circuit that will power my Raspberry Pi using Lithium Polymer. My knowledge of LiPo is rather low and I believe they can get dangerous if used incorrectly so I turn here. THe ...
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  • 228
5 votes
2 answers
1k views

Charging one capacitor with another capacitor in LTspice

I'm trying to simulate charging of one capacitor \$C_2\$ by another \$C_1\$ using LTspice. Following the derivations in this video, I found that in the end, both capacitors \$C_1\$ and \$C_2\$ should ...
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5 votes
3 answers
281 views

Battery charging circuit Q

Apologies this has probably been asked before - I have been looking but I think I don't know the terminology to answer my question. I have a micro-controller based project and I want to power it ...
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5 votes
1 answer
34k views

Charging lithium batteries with solar panels

Let's say I have a battery pack made from 3 lithium-ion cells connected in a series (making a battery with around 12 volts). That battery pack has a PCB with balancing function and also protects the ...
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  • 73
5 votes
2 answers
4k views

Super capacitor directly on the power supply

simulate this circuit – Schematic created using CircuitLab I have an atiny with an RF emitter which would detect the 220V AC off in the circuit and send a radio signal. to do this I use 2 ...
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  • 191
5 votes
1 answer
1k views

Can Type-C device be configured as "Sourcing Device" without Power Delivery protocol?

I'm designing a device, that will be connected to various Android devices with either microUSB B or USB C receptables (in order to make it futureproof) and will be exposing some irrevelant ICs to the ...
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