Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [charging]

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

732 questions
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Does the charger consume power after charged device is disconnected?

Quite similar to this one. If I'm not mistaken any impulse mobile device charger is still consuming power, when plugged into socket, but when cable is disconnected from charged device. Correct? Does the same rule goes for power sockets equipped with…
trejder
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How come charging a phone with less current is just slower?

I am wondering how charging circuits works; obviously there is some misunderstanding on my side. For example, a mobile phone is sold with a 1.5 A adapter. One can assume that charging and powering the phone can load up to 1.5 A. How is it possible…
Divisadero
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Why such large error on Tinkercad opAmp in my setup?

I'm working on a device that would restore voltage on my collection of used 18650 cells. The theory is that they need to be charged extremely slowly with constant current of max 100mA until they are around 3V. This can take above 24 hours. To make…
Filip Franik
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1 answer

Li-Polymer Charge cycle

The Li-Ion battery has 4 stages of charging :the initial trickle-charging to bring battery to Pre-charge stage, then constant current charging, then constant voltage charging(its like floating....right?) & final stage Top-up charge" . Can anyone…
JP Singh
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Phone's touchscreen becomes unresponsive when charging

I have a Samsung A12. When using a charger for the phone other than the manufacturer intended, it seems that the phone's screen just becomes unresponsive whenever it is charging. What could be the reason for this phenomenon?
tryst with freedom
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I'm building a 48V e-Bike. I want to use a Predator 212 to spin a 12V car alternator to use as a onboard recharger. How do I connect this?

I have 4) 12V LiPo batteries, rated at 16A-hrs. They'll be connected in series, to make a 48V system to power the motor on the e-Bike. I also plan to use a Predator 212 (Harbor Freight engine) to spin a single wire AC Delco alternator as an onboard…
Michael Keegan
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How much can GaN components make powerbanks and chargers smaller and lighter?

There is a lot of talk about GaN circuits making chargers more powerful at the same size as traditional silicon-based chargers. But are there any benefits if the goal is to minimize size and weight with the some power, or do the advantages of GaN…
sup
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What happens if I use the 110v (US) electric toothbrush charger on 220v (South East Asia)

I accidentally charged one cycle and the toothbrush still works. But is it safe to use it in this voltage? What's the effect on the battery? Does it charge in half voltage or is there any in built voltage regulation?
Shamal Karunarathne
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charging 4 Li-Ion cell in parallel with a bench top power supply

I got a Li-Ion battery which has four INR18650MJ1 cells connected in parallel. Since I don't have a charger dedicated to custom batteries, I'm trying to use a bench top power supply. I saw from internet that it is optimal to charge Li-ion cells in…
Nownuri
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how to reduce the current without changing voltage for charging a 9 v battery

I have some rechargeable ni-mh 9v batteries (all 200mah) laying around and a 9v adapter with current output of 210ma... I know that 9 v batteries require 1/10th of its capacity to be charged (ie 20ma)...So ,is there a way to reduce the current…
debjoy bhowal
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