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Questions tagged [battery-charging]

Please specify the battery type in your question. Include chemistry (e.g. lead-acid), voltage, number of cells and how they are connected (series or parallel), capacity (in A·h or W·h).

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1answer
35 views

How can I evaluate the condition of used lithium ion batteries?

I am coming into possession of hundreds of 18650 batteries. They are used, but initial checks indicate over 90% of them are good batteries. I would like to discharge, charge, and measure capacity of ...
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1answer
35 views

Switching between series and parallel battery connection

Previously I made same scheme (attached) but with two relays and it worked pretty well. Now I want to rebuild it with transistors (MOSFETs). The main purpose as I mentioned in the subject is to ...
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0answers
32 views

Can I force my battery pack to output specific amounts out of each port? [on hold]

Let me explain, as I wasn't sure how to phrase it concisely in one question. I've got a portable battery charger, this one specifically, and I am attempting to power 2 devices from it. One of them ...
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2answers
59 views

Wristband charging technique [on hold]

I was wondering how waterproof wristbands are charging. I suppose is a common technique that all vendors are using. For example my wristband has two exposed leads as it seems below. The charger has ...
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0answers
41 views

I wonder how I should have a backup cellphone always on, always charged almost never used [closed]

I wonder how I should have a backup cellphone always on, always charged almost never used. Today we have this for emergency in and out, it stays in the charger and are as good as never used. After ...
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1answer
40 views

Charging a battery bank [closed]

I am trying to build a battery bank charger with a 5 V solar cell. I am connecting the solar cell to the battery bank that says 5 V/1A input on it. I get 5 V out from the cell in the sun. But the ...
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0answers
50 views

Improvising for a 5v 2A device [on hold]

My 5v 2A charger got damaged, my phone is a 5v 2A device. So I was wondering if connecting two 5v 1A chargers in parallel to give me 5v 2A to charge my phone will be a good idea?...
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1answer
30 views

lithium 72v(2x 36v series) charging with double 36v charger For ebike project

Edit1: Voltage is wrong but here basic wiring diagram for paralel to series Changeover switch a diagram i found on internet closest to what i want i want to series 2 36v battery pack i know to ...
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0answers
72 views

Control of battery charging

I have been developing a control software for charging and discharging battery in a dc grid. The system consists of: 01) Three phase alternator with three phase diode bridge rectifier at its output ...
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0answers
19 views

voltage polarity exchange and reverse protection circuit

Ordered voltage polarity exchange and reverse protection boards from China but they never arrived. Trying to recreate a circuit diagram from a picture and need help. Found this article. https://www....
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1answer
30 views

Should I charge an in-series 6-pack of Li-ion batteries at 4.2v 1A or 25v 1A?

I have a 6-pack of 18650 Li-Ion cells connected in series, so it gives around 22v dc output. To charge a single Li-Ion cell I need a 4.2v 1-1.5A charger, simple stuff. But to charge the whole 6-pack, ...
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1answer
46 views

Charging a 4.4v lithium polymer battery with 5v?

Can anybody tell me how can i charge a 4.4v lithium poly. battery. I have a tp4056 charging circuit, but the problem is that it stops charging at 4.2v. I have searched on Ali but haven't found any 4.4 ...
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1answer
38 views

Identical li-ion packs in parallel

I'm looking for a 1kWh battery at 36V, something around 30Ah should be fine. Browsing popular sites I see that the lower end starts at about $400 which is a bit over what I'd like to pay. I stumbled ...
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0answers
45 views

Charging a US-made rechargeable flashlight in India (240V)?

I'm planning to buy a Ledlenser MT10 rechargeable flashlight (the flashlight uses a Li-ion 18650 battery). The company manufactures in the US, and designs in Germany. Will I have problems charging ...
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0answers
23 views

Battery Charger IC for Li-Ion charging via USB, which automatically determines the highest current available via VBUS

I am looking for an IC for charging a single Li-Ion battery via USB with the highest possible current available through the connected USB device (100mA up to 1A or 1.5A). The IC should not depend on ...
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0answers
28 views

Using TEG modules to charge a 5V Li-ion battery

The number of TEG modules is not necessarily a constraint. There are a couple of ways to do this that I can think of: Simply connecting the TEG modules in series. Each of them have been tested to ...
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0answers
20 views

Is it possible to increase the charging current of a TP4056 with a MOSFET for a LiPo?

I want to charge a Lithium Polymer battery at 6A - can I use a MOSFET to increase the charging current of a TP4056 by connecting it to the "Charge Complete" pin?
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1answer
30 views

Disconnecting system load during charging

I'm designing a charging circuit for a single-cell li-ion battery that powers a PCB with high-power LEDs. For safety, I want to disconnect the PCB and the high-power LEDs during charging. Therefore, I ...
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1answer
28 views

Solar LiPo battery charger: revision and improvement of the reverse voltage protection circuit for the battery

I am designing a solar charger with MPPT for a 1-cell lithium polymer battery of approximately 6000 mAh. The solar panel is 10W and 21 Voc. I am trying to ensure that the charger has protection ...
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0answers
40 views

18650 voltage slowly rising from an undervoltage

I found some Power bank which haven't been used for quite a lot and connected it to a USB tester to measure the voltage and Amps from the input to the battery controller module. and using a multimeter ...
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0answers
64 views

LiPo short circut

I connected my LiPo battery (4S 1500 MAH 14.8V now 15.2V) to the charger that came in the set through the pins and there was a short circuit. I unplugged the charger immediately. The smell of burned ...
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1answer
27 views

Charging Li-Ion with BMS and CC-CV DC converter

I'm currently building my own electric longboard and even though I looked through some resources considering this, I am not a 100% sure that I am on the right path. I want to use a 10S2P battery ...
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2answers
85 views

Is it normal to have 40% capacity after 1.5 years of charging Li-Ion? [closed]

I have a laptop computer that spends 99% of its time plugged in. The last time prior to today I used the computer not plugged in was 1.5 years ago. Today morning, I put the computer to sleep (with ...
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1answer
50 views

Charging 4 x 12V lead acid battery with solar in series or parallel?

I have a small electric vehicle that currently uses 4 x 12V 8Ah SLA batteries wired in series as its 48V battery packs. I have 2 of these packs. In order to charge the batteries, I unplug all of them,...
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1answer
26 views

If I am discharging a battery at 30% of its energy and then charging it at 0.8C. How long will it take to be completely charged?

Suppose that I have a lead acid battery that: Can (and will) be discharged by using 70% of its energy (energy left is 30%) When the battery is at 30%, I will recharge it at 0.8C. How long will the ...
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1answer
29 views

Tp4056 Module 12V input

I want to build a lithium ion battery charger with tp4056 module but most of my power supply's voltage is 12-19 V Datasheet says input voltage is 4.5-5.5v and current 1A Can I connect 1-3 tp4056 ...
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6answers
7k views

Can I disable a battery powered device by reversing half of its batteries?

When I have a device that is powered by two batteries, can I disable it by turning one battery around? For illustration, the purpose is to leave batteries in the device for storage, but it does not ...
0
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1answer
105 views

Why does my 12V SLA Battery behave strangely when charged by simple LM317 circuit?

I'm currently working on a DIY alarm circuit and I have need of a charge controller for a 12V SLA battery. I picked up a XH-M603 charge controller (https://www.banggood.com/XH-M603-DC-12-24V-Charging-...
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2answers
88 views

Charging 3.7 V Li Ion battery with 5 V DC [closed]

I am trying to create a charge circuit to charge nominal 3.7 V (range of 3.5 V to 4.2 V depending on state of health) li-ion battery from 5 VDC. I don't want to use specialized charging ICs if ...
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0answers
30 views

Float charging current for AGM battery?

I have a no-name 2-stage trickle/float charger I bought "surplus" and I'm trying to decide whether to throw it out or not. It trickle charges a 35 Ah AGM battery up to 14.4V at 500 mA, then drops to ...
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1answer
78 views

Help me understand my campervan split charge relay

I am new to the world of electronics, but keen to learn. The below all relates to the 12 V circuit of my van. I have picked up a campervan which has a second "leisure" battery which powers items in ...
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0answers
63 views

Arcing contacts corrupt communication. What to do?

I have a robot with external charging contacts and a docking station with exposed pads this robot has to drive into to start charging. When trying to dock and charge I seem to get a lot GND bounce, ...
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3answers
101 views

Should I stop charging my laptop battery at 50%? [duplicate]

I know that there are lots of questions about battery health and charging, but mine is very specific. For a lithium ion battery, leaving it at full charge (or low charge) damages the battery capacity. ...
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0answers
40 views

Using BMS in serial with parallel charging

Is it possible to connect two 4.2V 18650 Li-ion batteries in series but have them charged in parallel with 5V Usb wall charger? I have HX-1S-3576 as BMS. If i use 4 of these BMS as shown in the ...
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1answer
41 views

18650 pack with many series BMS for faster charging?

I'm building a 1200W portable stereo system powered by repurposed laptop Li-Ion cells. In order to get a minimum 8 hour play time at maximum volume, as well as provide some external power via an ...
0
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1answer
71 views

Is it normal to be able to hear a high pitch buzz from devices that are charging?

I have noticed that in ungrounded outlets I am able to hear an almost silent high pitch sound if I plug in earphones into the device being charged. I think this is the 50 Hz electrical signal that I'...
6
votes
1answer
683 views

How should i charge 3 lithium ion batteries?

I'm new to battery charging and I was wondering. What is the best way to charge and manage 3 18650 cell batteries? The load is about an amp and I have a 3.7 amp power supply to charge them. I'd like ...
0
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1answer
72 views

At what point a battery becomes a load

This has probably been asked before but I don't know how to search for it. In a circuit where there are a battery and a variable power supply, what conditions have to be met in order for the battery ...
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2answers
52 views

Battery life impact with fast charging

Typically fast charging reduces backup time and life. Now a days almost all handsets are coming up with different fast charging capabilities. I'm currently using Galaxy Note9 which has fast charging ...
0
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2answers
75 views

USB and LiPo power supply with charger

I'm having trouble designing a power supply circuit for a small microcontroller-based project. The board I'm building will be powered by a 3.7V LiPo battery most of the time, but it could also be ...
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1answer
69 views

If fast charging a device causes the lithium battery to drain faster, why doesn’t that apply to Tesla super chargers? [closed]

Some iPhone chargers are 'fast' chargers which deliver more than a single amp and charge the iPhone faster. Tesla Superchargers are known for charging a battery fast as well. But since charging ...
0
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1answer
28 views

Li-ion custom protection circuit module (PCM) design and de-rating

I am designing a custom PCM (protection circuit module) for Li-ion cells provided by a supplier ( they offer PCMs but they do not meet our RF immunity spec ). The supplier-provided PCMs have a charge /...
1
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1answer
123 views

Building a Huge 18650 Battery Powerbank DIY [closed]

I know there are a lot of threads about this topic already, but I still have some questions about it. Anyways, I am thinking about making a 50-80 thousand mAh power bank depending on the batteries and ...
0
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1answer
66 views

10 Amp Current Limit

I have a 28VDC, high current supply (constant voltage) that is required to charge an emergency power supply. These EPS internals are rated at 15 amps max input current, however, it’s stipulated that ...
1
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1answer
63 views

How to choose appropriate DC-DC converter for Electric Vehicle battery charging application? [closed]

I'm currently working on a project which requires building an EV battery-charger as a starting point. At present, I wish to design it for a 220 V, 50 Hz grid source input. The nominal voltage of the ...
1
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1answer
35 views

Charging series / parallel 18650 battery pack

I have a 18650 battery cell configured as 4 pairs in parallel wired in series for 16 volts. I first CC/CV charged the paralleled pairs to 4 volts each and stopped the charge at 50mA. I would like ...
1
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0answers
60 views

Is it possible to fully charge a 12V lead-acid traction battery using a car battery charger?

I got a 45Ah 12V traction battery for my experiments and I was assuming that I can recharge it using a normal car battery charger (the main difference between 12V car starting battery and 12V lead-...
3
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1answer
127 views

Does keeping a mobile phone plugged in increase its battery's lifetime?

As far as I understand, keeping a mobile phone plugged in would draw current from the source (i.e. an USB port) rather than from the battery. Therefore, the battery would not be used as long as the ...
0
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0answers
18 views

Charging and monitoring LiPo battery on docking station

How can I charge a LiPo battery (4 cells) without the "classical Lipo Balance Charger". Also, is it possible to monitor the battery level from, let's say a Raspberry Pi?(Using the 4 pins that are ...
0
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1answer
66 views

Maximum Initial cutrent parameter of Lead-acid batteries

On lead-acid batteries, there is a parameter called "maximum initial current" which is generally written on it. I have added some pictures of it at the end of the question. My confusion is how to ...