Stack Exchange Network

Stack Exchange network consists of 174 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
1answer
85 views

Converting 5V USB to 12V [on hold]

I have just bought a laptop that I would like to be able to charge via my power bank. The power bank in question is Aukey 30000mAh. Specs for the USB port: Type-C Input/Output: 5V 3A Output (Quick ...
0
votes
0answers
23 views

Programmable Charging controller for Li-ion/Li-Po [closed]

I'm looking for a programmable charging controller (or set of ICs), that resembles laptop battery controllers. It will go inside of a battery pack with a small MCU and EEPROM. Critical features: 0) ...
0
votes
1answer
18 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
66 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
13 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
26 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
38 views

Rechargeable battery datasheet

Some parameters on the datasheet are a little bit confusing. What does the datasheet mean?
0
votes
1answer
54 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
27 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/...
-1
votes
0answers
71 views

Samsung Powerbot Vaccum - bypass charging dock?

I have a Samsung powerbot VR9000 robot vaccum. It has 2 contacts on the bottom of the robot and docks with a 'charging station' when it is low battery. The charging dock does not charge it at all. It ...
0
votes
1answer
53 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
38 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
0answers
28 views

Would it be adventageous to switch a generator's coils to maximize inrush current inductance at zero crossing?

I have been designing power supplies and have been reading a lot of research papers on how to suppress the transient voltage spikes and current transients created by inrush current. Would it be ...
0
votes
2answers
85 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
286 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
34 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
61 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
142 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
65 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 ...
-1
votes
0answers
52 views

Charging multiple batteries with TP4056 witht battery protection

I've searched the archives but none seemed to be similar to my situation. So based on my poorly drawn diagram, all batteries will be in parallel. I will be using TP4056 with protection and was ...
0
votes
2answers
85 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
43 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
119 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
129 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
97 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
53 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
152 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
264 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
108 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
65 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 ...
0
votes
0answers
27 views

Ultra low drop CV and CC mode for 1 amp charging

I am looking for 1 amp charging solution in which input and output voltage having 0.4v difference with 1 amp constant current control. I go through LDO regulator which is giving 1.2v difference in ...
2
votes
1answer
57 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
311 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
116 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
106 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
124 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 ...
0
votes
2answers
80 views

What is the maximum charge current and discharge current of R5460 Series IC?

I am using "R5460N214AF" IC for 2 cell Li-Ion battery protection. According to datasheet, excess discharge current threshold is 0.2 V and excess charge current threshold is -0.2 V. I would like to ...
0
votes
2answers
91 views

Batteries have a constant charging speed from 0%→70% instead of being any faster at 0%?

A mobile phone I tested keeps charging at the same constant speed from 0% to 70%, which is 10 watts. It uses MediaTek PumpExpress (input power: 12V 0.83A, despite the wall charger is capable of 12V 1....
1
vote
1answer
87 views

Qi charging multiple devices with single transmitter

I am looking for a Qi charging compliant transmitter and have found kits from different manufacturers like ST/TI/Microchip. These kits have one receiver and are tuned to work together. How can I ...
0
votes
1answer
295 views

MPPT charging a li-ion battery

I just designed this MPPT solar charge controller which outputs 4.2 V regulated via MPPT, it uses the SPV1040 IC. This will be used on a satellite with 4 side panels, each with 8 solar cells in ...
0
votes
2answers
77 views

Charging a lithium-ion battery with 5V but stopping at 4.2V

I just want to charge one lithium ion cell, but don't have the right equipment. I only hear it's possible to charge one if you use 4.2V, but that's only, because a higher voltage means higher current ...
0
votes
2answers
188 views

USB 5V 2.1A Charger Destroys Device

I have a USB powered device with an internal Li-Ion battery that has overheated and died. After looking for similar events online I found that charging on a 2.1A charger can damage or destroy the ...
0
votes
2answers
90 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
1answer
83 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 ...