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Questions tagged [charger]

A device which controls the voltage and current being delivered to a capacitor or battery.

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1answer
36 views

Ouput resistance of a charger

I want to measure output of a charger (MODEL: GB28-25126) with below picture: When I connect my HIOKI multi-meter (3280-10F) to output of my charger in order to measure the resistance, it shows OF (...
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0answers
38 views

Solar charger for lithium batteries

I am trying to build a 2s 7.4V solar charged lithium battery pack to power an arduino UNO and SIM900 GSM shield. I have a 12V, 10W solar panel, BMS protection board and a DC-DC CC CV buck converter ...
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26 views

MCP73831 stat pin current

I'm trying to implement a bi-color LED connected to a Microchip MCP73831 battery charge management controller, so I can switch between red and green LED output. Currently my circuit is mixing them ...
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2answers
66 views

Smart charger - how to detect current and voltage of different battery packs and then charge them accordingly [closed]

I am thinking of designing a smart charger for a few of my bikes/scooters, etc detects current and voltage of the pack (30-60V, 1-5A) charges the pack accordingly in the CC-CV mode, fast-charging ...
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0answers
14 views

bq24171 battery charger does not charge

I want to make a 2S LiPo battery charger. I used the bq24171 chip from TI and followed the datasheet. All the conditions to enable charging seem to be ok but there is no actual charging (no output ...
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1answer
74 views

How does one charge a 37-volt lithium battery? [on hold]

I have removed a 37-volt lithium ion battery from a self-balancing scooter for a robotics project. I retained the PCBs of the device for charging the battery. Unfortunately, the electronics appear to ...
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0answers
38 views

When a charger is powered off, Will it draw any current from battery?

I have a LiIon battery pack connected to a charger permanently. (The pack has a protection board, to prevent over charge and over discharge.) But the charger may be switched off occasionally due to ...
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3answers
145 views

Lithium-ion battery charger circuit design [closed]

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a ...
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3answers
1k views

Charging phone battery with a lower voltage, coming from a bike charger?

Since travel by bike a lot, and use my phone very often during those trips, I tried designing a USB phone bikecharger that would use my bike-dynamo that also powers my lamp. Yesterday, I did my ...
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2answers
51 views

Use lithium ion car jumpstarter to charge netbook? [closed]

I have a Gooloo car jump starter pack. https://www.amazon.ca/gp/product/B06X9R8QSY Can I use it to charge a small Gateway Nav50 netbook? What kind of adapter would I need? I suppose I could use ...
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3answers
110 views

Why is a laptop power supply output voltage different from its battery?

I hope you will not mind answering. This question has long been on my mind. Normally, the adapter output voltage is higher than that of the battery. In my laptop's case, the output voltage of the ...
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0answers
22 views

Responsible Battery Reserve Capacity and Low voltage?

It's been asked here, but looking for clarity. How bad is it to undervoltage a 12-volt lead-acid battery? SLI automotive starter batteries list RC (reserve capacity), but I think this a usable ...
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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 ...
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1answer
51 views

MCP73871 Battery Under Voltage Protection

I want to use MCP73871. Is there a battery under voltage protection in this charger IC? or may I use a battery protection IC? Answer for @Bimpelrekkie I decide to use my power architecture as ...
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1answer
77 views

How many 1.5V batteries can I charge simultaneously in series?

I'm wondering if there is a limit in terms of how many batteries can I can charge simultaneously ? I would like to charge 30 batteries at the same time, they will all be in series. Will it work ?
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18 views

Balance charging lipo cells with balance charger

I like to build a 14.4 v batterie pack from 4 x 2 lipo cells. But the balance charger can only handle 6 cells. In videos it looks like as if the balance lead is connected between two cells. So that ...
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1answer
42 views

E-bike battery needs custom charge voltage, but how?

I thought I'd give my old e-bike an upgrade, and I've build a 8S4P battery with charge controller (BMS). The thing is the electronics of the ebike quite working @ 31.5 V - a fully charged 8S battery ...
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0answers
38 views

Do I need a cut off circuit for my battery

Do I really need an auto cut off circuit for my battery when my charger only outputs 13V and 1A at max. The battery I want to charge is a 12V 7Ah Sealed Lead Acid. I heard that the cut off for lead ...
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3answers
79 views

Charging 2 12V batteries with a 19V 3.42A laptop charger

I was wondering since the voltage of my laptop charge is too high to charge one battery, it occurred to me if it could be possible to make a parallel or series arrangement to get my 2 12V batteries ...
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1answer
28 views

Cordless vacumn charger rating calculation

I got a cordless vacuum whose charger got damaged and I found a "close enough" replacement. What could be the new charging performance that I can expect or how can I do a calculation to determine the ...
1
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1answer
36 views

When a power supply has multiple stated output parameters, are those discrete output settings or some possible settings along a continuum? [closed]

Let's take my 30W USB-C Apple power supply as an example: https://www.apple.com/shop/product/MR2A2LL/A/30w-usb-c-power-adapter. Printed on it are 4 outputs: 20V / 1.5A 15V / 2A 9V / 3A 5V / 3A Are ...
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0answers
27 views

How to solder a trrs 2.5 cable to an old charger

I need to solder a trrs 2.5 cable to an old nokia charger, so I can charge my JBL E40BT headphones. My problem is I got the cable from an old set of earbuds, and I don't know what cable goes welded ...
2
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1answer
66 views

Why is there a maximum charging current much lower than maximum discharging current on a li-ion pack?

I will have soon an electric scooter with a 60v (top 67.2v) and 35ah battery pack. As it is designed, it can be charged by one charger which pumps 2,5 amps or it can be charged by 2 chargers in ...
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2answers
75 views

I want to make an auto power cut off for my battery charger

I have a charger for a 12v battery but it is without auto power cut off. I know I need a circuit consisting of a comparator and a relay and I drew the circuit but I don't know if there is something ...
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2answers
104 views

How to use CC/CV Charger with a DC/DC converter

I am searching for a solution to charge a battery pack (7S1P)[ICR18650] with a charger with CC/CV mode and I have a BMS for protection (I've done research to maximise the security of the battery pack)....
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1answer
37 views

How to deactivate Li-Ion battery charger

I have a USB device, which does have a Li-Ion internal battery in it. The device charges the battery when plugged into a socket. However, I don't want that battery to be used at all, I do prefer that ...
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1answer
51 views

Is less than 1A enough for TP4056 module to charge one battery?

I want to charge 3 separate 18650 cells with one charger. Each one of the batteries has their own TP4056 module. So in total there are 3 TP4056's. I know that TP4056 is rated at 1 amp input, though my ...
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1answer
37 views

Power supply design with charging circuit

I am designing a GSM modem power supply circuit. The circuit requires a 2A power supply. The module SIM800C itself can be powered directly by Li-Ion or Li-Poly battery power. I am looking at a ...
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0answers
40 views

How to charge Lithium Ion with protection circuitry

I am trying to build a charger for the Ctr 003 battery for the Nintendo DS. This battery has 3 outputs, which I call +, 0, and - for simplicity. When I measure voltage from + to -, or from + to 0, I ...
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2answers
720 views

Is it possible to convert 19.5V 3.33A to 12V 5.5A?

I have a laptop charger which has 19.5 V 3.33 A output. I want to use it for raspberry, which needs 5V and 2.5A and for monitor which needs 12V 3A. Is that charger strong enough to run the whole ...
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2answers
129 views

Any trick to use the ground pin? [closed]

I have bought a new charger for my laptop. The case of my laptop is made of steel and so it sometimes give electric shock as I don't have a ground wire in my house. And, I currently don't have any ...
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22 views

Charger and inverter wired in parallel

I have two large lead-acid batteries (208ah) that I’ve acquired. I’d like to connect a float charger to keep them charged and at the same time connect an inverter to run a few select loads. Normally, ...
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1answer
36 views

Emulate Li-ion battery using a charger

I bought an iPad with dead battery (it’s bulged). When I connect it to a charger, the only result is a boot loop (Apple logo, blink, Apple logo, blink…). I want to use it as a kind of picture frame, ...
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2answers
87 views

AC voltage on the outside surface of micro USB charger cable

My micro USB mobile charge cable is having about 98V AC voltage on the outside surface. (PFA measurement image. The black probe is connected to the Power socket Ground port. I could not take the whole ...
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1answer
77 views

How do I know if TP4056 charging modules are faulty

I've bought 10 of TP4056 Lipo charging modules from a Chinese vendor. Tried using them in something I've built, but whenever I plug the power source in, the charge led doesn't light up. In fact it ...
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0answers
25 views

USB wall charger current question [duplicate]

I have a USB wall charger with this text on it: INPUT: 100-240V 50/60Hz 0.5A OUTPUT: 5.2VDC 2.0A 10.4W I'm building a circuit I want to power via USB and I calculated it would sink 500mA from ...
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2answers
93 views

What happens when devices request different voltages from a USB hub? [duplicate]

I'd like to charge two devices with one USB charger, one requests 5V, the other 9V. I plug an USB hub (potentially an old USB 2.0 one) in the (9V capable) charger and plug the two devices in the hub. ...
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1answer
64 views

Using B0505 for connecting phone chargers in parallel

I am planning to charge four 18650 Li ion batteries that are connected to four TP4056 in parallel making 4 amps in total to charge them in their usual rate. I was thinking of connecting two 2 amp ...
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1answer
90 views

Whistle while charging small cell phone power bank

I've one of those small batteries used to charge mobile USB devices like cell phones when there's no accessible power outlet around. It's a Cellularline FREEPSLIM3000 model HY-L-3000. Last time I ...
1
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1answer
77 views

What's causing the audible 7/8th rhythm in Qi chargers?

I have a wireless Qi charging system for my mobile phone. When I put the phone into the cradle it starts getting charged and I can hear a very quiet noise coming from the arrangement. Other ...
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3answers
54 views

Does a plugged in 12v usb-charger use energy when no device is connected?

I hard-wired a 12v cigarette-plug into my a-pillar. The whole point is to have an additional phone charger on the leftside where my phone mostly sits. I connected it directly to the battery ( with a ...
1
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1answer
56 views

USB UART Bridge with capability of handling fast charge VBus

I am trying to design a charging circuit which support QuickCharge but also I want to add USB-UART bridge to communicate with on board MCU. How can I establish voltage level safe communication ...
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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 "...
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1answer
49 views

Connecting a Solar Panel and Power Supply in parallel, in order to power up a load

I am using a Solar Module to charge a LiPo battery. The current supplied by the solar module goes into a battery charger IC and from there to the battery. This works fine. Now I want to add an ...
1
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1answer
178 views

NTC thermistor series/parallel resistor calculation for MCP73833 linear Li-Ion charger

I am using MCP73833 which has the following datasheet https://ww1.microchip.com/downloads/en/DeviceDoc/22005a.pdf Internal diagram as follows: They says that "An internal 50 μA current source ...
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1answer
70 views

Charger, load sharing and Fuel gauge

I'm designing a battery powered circuit where I would like to charge the battery via USB, and monitor the remaining battery capacity during operation. I'm using the following IC's: MCP73831 (charger)...
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1answer
54 views

How to tell a battery's ideal charging voltage with a circuit?

simulate this circuit – Schematic created using CircuitLab I've been looking to build a universal charger for my laptop and phone, and I'm wondering; is there a viable way to adjust the input ...
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2answers
76 views

What should be the V specs of a step down transformer for a 10amp car battery charger

I was looking to create a 10amp manual charger with variable voltage and current option for flooded lead acid battery (normally used in cars). I only know some basic electronics and usually make ...
2
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0answers
239 views

DIY 4S Li-Ion battery pack

I am in need of some help designing my battery pack. I have a few concerns, mostly around charging. My plans consist of using a microUSB boost converter to bring the voltage to 16.8V for charging. ...
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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?