Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [charging]

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

0
votes
0answers
27 views

charger design for 48V 20Ah lead acid battery

I have to complete project of battery charger for 48 V 20 Ah Lead acid battery having 5 A max charging current. I have designed boost pfc using UC3854 and buck converter . Output of buck converter is ...
1
vote
2answers
79 views

How to efficiently trigger QC and convert it to constant 5V and a peak of 5A?

Introduction For a university project I started working on RGB LED Shutter glasses, which are based on the idea of a kickstarter by Macetech. However, these glasses miss some features I was looking ...
-1
votes
0answers
31 views

#mR on a battery charger screen

I have a smart battery charger that works very well, but one part of the screen just confuses me. When charging or testing a battery, it will display a (seemingly random) number followed by mR. ex- ...
0
votes
0answers
32 views

Help adding a battery charger

hey there I designing a RFID locking system that i will be running off 12v battery and i have the base circuit built but i would like to add in a system to charge the battery thought the usb port. ...
0
votes
1answer
28 views

Battery wiring for DIY speaker question

could anyone tell me if i can wire the 12V battery to get around 20V out of the whole set? Right now it's wired in parallel which increases capacity but i need around 20V for the amplifier to have ...
0
votes
1answer
49 views

Quick charge negotiation device [duplicate]

I'd like some advice on how I can negotiate a Qualcomm Quick Charger up to a certain voltage. I have a "dumb" appliance which usually uses its own transformer/"wall wart" at 12V 1A. I also have a USB ...
0
votes
1answer
48 views

Lt-spice switch model

I have a very simple circuit and want to see the current in the inductor. But I do not know why switch is behaving like that... Actually, I supposed to get KA range current. but it gives me very ...
0
votes
1answer
73 views

built in charge controllers take amps they need?

Many devices have built in charge controllers that stop charging when battery is at 100%. I read several places that you can charge devices with the manufacturers recommended voltage and that higher ...
0
votes
4answers
132 views

What will happen if I use laptop charger (3.42A, 19.2V) to charge 12V battery? [closed]

The battery's voltage normally is 13.8V when it fully charged. Say I have 5.7Ah motor bike's battery. The laptop's charger will be connected to a battery. The positive port of the charger to positive ...
0
votes
0answers
40 views

trickle charge backup battery

I would like to know if the schematic below would work to keep a 12V SLA battery at or close to float voltage to be used as a backup battery? R1 will limit the charge current to the battery, but am I ...
0
votes
0answers
54 views

Battery float voltage of CN3722

I want to charge a 2-cell Li-ion battery with CN3722 charging IC. According to my circuit design, the float voltage at the battery terminal should be 8.4V. But, the float voltage is measured as 13.44V ...
0
votes
0answers
24 views

Conflicting information on Qualcomm quick-charge 3.0 standard

Out of many fast charging protocols, Qualcomm quick-charge 1.0/2.0/3.0/4.0/4+ is a prominent one. I tried to find the specification of quick-charge 3.0 protocol. However, the material spread across ...
1
vote
1answer
81 views

One Way Current Restrictor

Will the below circuit act as a one-way current restrictor to allow 100A to flow out of the battery, but limit charging current to 10A into the battery from the alternator?
-1
votes
1answer
133 views

Charging my laptop via powerbank, it worked! [closed]

First of all let my say that i'm NOT an electrician or an electrical engineer. i'm just a guy who wanted to be able to chagre my laptop via my powerbank and this is how i did it. The power bank i ...
0
votes
1answer
42 views

LTSpice - PMOS Gate not turning on

My question is why is the M2 PMOS FET not turning on when Vchrg_ctrl is LOW? My problem is Vload never goes high to charge the Capacitor C1. I think I am missing something very silly here. Thank you ...
0
votes
3answers
76 views

USB current draw and CE marking

We have developed a docking station product which charges multiple devices simultaneously, and currently ships with a 5V, 3A barrel jack adaptor. We are looking to move this over to USB power, and ...
0
votes
0answers
15 views

mcp73831 is on and off

I am trying to design a circuit that will be fed by usb and a lipo battery with charging while usb is plugged. I have just built the fist sample, however mcp73831 seems not to be working as it should ...
0
votes
1answer
32 views

LTC 4150 coulomb counter property

I want to monitor the capacity of a 7.4V, 2200mAH Li-ion battery. I have found a that LTC4150 coulomb counter can able to measure the battery capacity. So, suppose I have connected a fully charged ...
0
votes
1answer
45 views

Rechargeable battery datasheet

Some parameters on the datasheet are a little bit confusing. What does the datasheet mean?
0
votes
1answer
63 views

Power bank multiple output currents

I've been working on a simple power bank project that's been built using Li-ion batteries, the batteries are rated 3.3 V. I've implemented a charge controller which can efficiently charge the power ...
0
votes
1answer
28 views

Powering dual 5VDC, 2.4A USB ports via a switch in vehicle

I have an illuminated 2 port usb charger that plugs into a cigarette lighter/accessory socket in a car. The face of the charger is flat and sits flush when inserted into the cigarette lighter/...
0
votes
1answer
57 views

Laptop chargers that say 20V, are they for charging 5s?

I understand that 5s Li-ion should be charged at 21V (4.2*5) however the only laptop chargers I can find are 19V, 20V, and 24V. Each is relatively close to the value that should be used for 4s, 5s and ...
-1
votes
1answer
40 views

Power consumption [duplicate]

A phone charger is rated with input of AC 240v 50/60Hz 0.35 amps will it accept only 240 v 0.35 or will it take full 240 v 16 amps and step it down please I am very new to electrical stuff please help ...
0
votes
2answers
125 views

Capacitor charging efficiency with a constant power source

I have a question. It is easy to derive the efficiency for loading a capacitor from a constant voltage or a constant current source, basically because exponential functions and constants are very, ...
0
votes
2answers
510 views

Correct charging current for lithium-ion batteries

I am trying to replace a lithium-ion battery for my Bose QuietComfort 35 headphones. I cannot find the datasheet for it. The battery is an AHB110520CPS (AHB110520) by Synergy. It is supposedly an "...
1
vote
1answer
44 views

Balance charging connection for 2 cell li-ion

I am designing a circuit powered using two 18650 li ion cells in series, I will wish to charge it with an imax b6 charger with balance output. Is it enough to connect the 3 terminals of the charger to ...
1
vote
1answer
97 views

Is it safe to charge single 18650 cells without temperature sensing?

I was looking at 'power bank' circuit boards on Aliexpress, the kind that you add to a 18650 cell to make a basic 5V in/out supply. I noticed they all seemed to be lacking any kind of temperature ...
0
votes
1answer
147 views

I need 5v@500mA to 12v@5A for 2.5 seconds every 5 minutes

I've run into quite the problem. I have a load that requires 12v@5A for under 2.5 seconds. However, my supply is a USB 5v@500mA. This is not an immediate load. The load will only need to be activated ...
0
votes
2answers
68 views

Connect 3 Lithium Polymer battery with different capacity in parallel [closed]

I am working on an IoT product with has a total current requirement of 1.3 A at the peak. Due to space constraint, we decided to select Li-Po battery with capacities one with 600 mAh other two with ...
0
votes
2answers
125 views

Understanding constant current/constant voltage charging of LiIon battery

I'm trying to understand exactly how CC/CV charging of a LiIon battery works and I tried to replicate it with a cheap bench power supply (RD Tech DPS3003) and a Samsung INR 18650-25R. The bench power ...
0
votes
1answer
66 views

Difference between more batteries and boosting voltage

For example if i need 18V for a project, what is the difference if i use 2 9V batteries and 1 9V battery boosting it to 18V? Thanks in advance.
0
votes
1answer
49 views

Does a 3rd-Party Cable cause any harm when charging your Phone with the original Power Brick? [closed]

When using the original Power Brick the Smartphone came with to charge it, does a 3rd-Party cable cause any harm to the device or is there no difference to using the original cable?
5
votes
4answers
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 ...
-4
votes
2answers
138 views

Charging 4x 18650 Li-Ion Batteries in series [closed]

Hello StackExchange community. So i have been for a long time wanting to build someything portable and recharchable with the 18650 batteries. the only problem is i cant find any good guide on how to ...
2
votes
1answer
154 views

How to find out what level of battery voltage corresponds to 50% discharge?

In my off-grid solar system I am using 12V lead-carbon batteries capable of surviving 4000 cycles when discharged up to 50%. Capacity is 200Amp-Hours (100 Hour discharge) per battery. There is no BMS ...
0
votes
1answer
21 views

battery load percentage - concept/definition

I have two pairs of bluetooth headsets which are used interchangeably on my smartphone. One of them can indicate the battery level and the other doesn't. I'm curious to know what this feature is ...
0
votes
3answers
114 views

I'm planning to put lots of phone chargers on one circuit, how to calculate this

This would be primarily for samsung S7 devices. Would like to be able to charge, say, 256 of them. They will work in groups of 16, trying to design the power flow of this. Was imagining that each ...
0
votes
1answer
35 views

Mobile charging during low main supply [closed]

Due to some electrical issues in my locality, the supply voltage of 230V was unfortunately reduced to 110V. When I connected the 5V charger (Input: 100-240V AC; 50/60Hz; 0.2A & Output: 5V 800mA) ...
0
votes
1answer
102 views

How to determine DC input voltage of a device without its charger? [closed]

Had a MotoMaster (Canadian Tire) 27/3 LED flashlight for 4 years now. Model was discontinued 2-3 years ago. Lost the charger at least 2 years ago and the light's battery FINALLY died today (!!) I ...
0
votes
1answer
55 views

How can I interpret the readings of a USB voltage tester considering the input voltage is 5V and I am charging a 3.7V battery?

I have this USB voltage tester that I place between my usb wall charger and a USB charging cable. This device gives me the total current that went through over a period of time. Let's say after 2.5h ...
0
votes
2answers
241 views

Li-ion battery cell balancing statistically unnecessary when many cells are in parallel?

Lithium ion batteries packs need to be balanced because of a small random voltage difference for each section in series, that may cause the voltage levels in a pack to diverge over time, right? So if ...
1
vote
2answers
379 views

DIY Android Auto Power Booster

first time using StackExchange so please be gentle (and pardon my ignorance with wiring and USB standards). I'm trying to create a USB power booster that allows Android Auto to function over my car's ...
1
vote
2answers
129 views

Can I charge my AC rechargeable hearing aid batteries via USB PD with converter?

I hope you'll be able to help. First of all this is a bit of a complex one that I'm struggling with. I wear hearing aids, both of which use removable, rechargeable batteries, charged only by a charger ...
1
vote
1answer
35 views

4Channel Smartphone Charger 5V 25A [duplicate]

I wanted to experiment a Smartphone Fast Charger. My source would 5V 25A, and output would be in 4 channels, all in parallel. Would that be safe to charge a smartphone? If no, what can I use to bring ...
1
vote
1answer
67 views

Basic RC Theory circuit

I had an issue using an Arduino Nano to investigate simple RC circuits. The capacitor would not fully charge to the supply voltage. I assumed it was something to do with the digital pin circuit on the ...
2
votes
1answer
67 views

EV Charging tripping MCB

We have found that our two EVs are tripping the 32A MCBs in our Consumer Unit, but from my basic knowledge the 2*6.6kW chargers on UK 3-phase should only draw about 19A. I've measured the power ...
0
votes
1answer
374 views

Using mosfet as diode (Making an UPS)

I'm trying to make a high power UPS, I have a 13.6V PSU and an Inverter and a Lead acid battery. Everything would be connected this way: There's a problem with that circuit, if the battery is too ...
1
vote
1answer
126 views

Charging a Li-Ion Battery

I am trying to charge an 850mah 3.7v battery using a TP4056 circuit that will recieve regulated 4.2v at a maximum of 500ma though the current can drop due to it being regulated solar power. What will ...
0
votes
2answers
127 views

How can I split a 5v power supply into 4 isolated (no shared ground or live) channels?

I need to power a number of tp4056's with the battery outputs in series (using tp4056's because I have a bunch already, and because I want to be able to add more cells in series later). If I do this ...
1
vote
0answers
171 views

Tp4056 overcharging

I have combined five 18650 cells in parallel and i am charging them using a single tp4056 circuit . The problem i am facing is that the module keeps on charging. I had to stop the charging manually at ...