Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [charging]

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

700 questions
39
votes
2 answers

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 little unclear about how this works. Existing…
ZeroKelvinKeyboard
  • 571
  • 2
  • 5
  • 5
29
votes
5 answers

Charging lead-acid batteries?

Are there any special requirements for charging lead-acid batteries?
littlebirdceo
  • 4,697
  • 8
  • 41
  • 61
28
votes
6 answers

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.
Farid-ur-Rahman
  • 1,011
  • 6
  • 22
  • 34
27
votes
8 answers

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 the maximum current for the device." A cursory look…
Kevin Wood
  • 283
  • 1
  • 3
  • 5
18
votes
3 answers

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 usually done at 10 Amps (2,3 kW) while 16 Amp (3,6 kW) charging…
hadrox
  • 323
  • 2
  • 5
17
votes
4 answers

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 parallel some to get required starting current.…
ozzo
  • 185
  • 1
  • 1
  • 6
14
votes
4 answers

Why is charging with Lithium batteries with a small load dangerous?

I'm well aware of the best practices for charging lithium chemistry batteries, and how the charges themselves work. I've never had a water tight explanation on why having a load on a battery during the CC phase is dangerous. My understanding is that…
Ben Bird
  • 394
  • 2
  • 12
14
votes
5 answers

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 - instead of throwing the rechargeable batteries…
Tim Lytle
  • 243
  • 1
  • 2
  • 7
13
votes
3 answers

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-down converter that drops the voltage from 18V to…
Physther
  • 563
  • 1
  • 6
  • 16
12
votes
3 answers

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 battery charging using a dynamo, which is present in all cars and bicycles. But what i…
user2830
  • 241
  • 1
  • 2
  • 5
12
votes
5 answers

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 supplies produce the regulated output. Moreover, why…
Asmat Ali
  • 323
  • 2
  • 9
12
votes
4 answers

Is there way to construct an 18650 battery pack with built-in balance charging? Or is balancing not very necessary?

I am a DIY enthusiast, especially in electronics. I'm currently building a portable Playstation 2 Slim with an IPS display, so that it would look like a Wii U controller. It's my first large electronic endeavor. However, being portable, I'd need it…
Paolo
  • 143
  • 2
  • 2
  • 8
11
votes
2 answers

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 is lead-acid technology). There's nobody left in…
Kyle B
  • 4,558
  • 10
  • 29
11
votes
5 answers

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 solve this question, I used two equations…
Aditya P
  • 337
  • 2
  • 16
11
votes
6 answers

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 I am running on a collection of normal AA…
Predominant
1
2 3
…
46 47