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
87 views

CN3722 charging issue

I'm using CN3722 for 2 cell battery charging. I have two way supply, it gets power from Solar as well as DC 12V whichever is available. The MPPT is set at 11V. Solar panel maximum goes to 21V. I ...
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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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40 views

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

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
272 views

How to design a circuit to disconnect battery charger automatically?

I want to use an AC to DC 14.4v adapter to supply both my circuit and its battery. The circuit works with 12v and I used a battery during power outage(blackout time). I have prepared the below circuit ...
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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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2answers
4k views

How many kWh to fully charge a battery?

If I have an 11.6 Ah 48 V battery, how many kWh does it take to fully charge it from empty? I calculated 556.8 Wh using the formula P = I * V (11.6 * 48 / 1000), which works out to be 0.5568 kWh. Is ...
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1answer
40 views

Charging a battery bank [on hold]

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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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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3answers
1k 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
314 views

How to make battery controller with arduino?

I want to make simple UPS with means of arduino, to learn the processes from it, and be able to record and monitor at PC. For the start i want to implement buffered usage charge mode. Logic is simple -...
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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
511 views

How long will my battery last under this load and with this source?

I need to calculate how long my battery will last until it is completely discharged. I have a load that will draw 154 uA at 1.8 V for a power of 277.2 mW. Assuming that this is running indefinitely ...
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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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1answer
742 views

Many questions about charging a lead acid battery

Well, I have a 12V 9AH SLA Battery, and I use a 7815 + a diode in series to charge it, (I really wanted to build a charger using the L200 or the LM317 but I couldn't find any of those in my city). So, ...
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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
190 views

What can you tell about our circuit diagram? Any suggestions?

This is our circuit for our research which is the conversion of heat to electricity. The TEG module will convert the heat to direct current. It will give energy to the voltage booster moduleto and the ...
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2answers
1k views

Large load connected to small solar panel and battery

I have a smaller solar panel (say 12v, 0.5 amp and therefore 6 watts) connected to a 12v car battery (assume lead-acid) directly though with the included blocking diode, there is no charge IC attached....
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1answer
179 views

Xbox one controller rechargeable battery

I wanna make rechargeable batteries for Xbox one controller.i'm new in this field So I have some questions 1_The controllers voltage input is 2.4-3.0 volt. Now is any issues if I use li_ion 14500 ...
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1answer
162 views

Li-Ion Rechargeable 2032 Button 3.6V Cell and Arduino

I have designed a battery powered Arduino device. The on-off switch connects the battery to the circuit. When the user plug USB cable while the switch is on, the battery and the circuit directly get ...
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2answers
128 views

charging 24v LiFePO4 with DC power supply intended for LED strip lights

I want to charge my 200Ah, 8 cell GBS LiFePO4 using my Honda 2000 watt generator. (I live on a boat). I have a BMS, active monitoring and all that. I just want to make sure the below power supply is ...
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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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1answer
188 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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69 views

MAX17205 battery pack fuel gauge configuration

I am working on the fuel gauge by MAX17205 for my project. https://www.maximintegrated.com/en/products/power/battery-management/MAX17205.html I am able to communicate with the chip using I2C protocol ...
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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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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
34 views

USB charging: getting the maximum current a power supply can provide [closed]

I'm currently designing a USB charger PCB for single cell Li Ion batteries. As computer USB ports are limited to 100 mA or 500 mA, respectively whereas wall chargers can provide much more current, I ...
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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
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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4answers
2k views

My 18650 Batteries get hot

I have a few 18650 batteries laying around, so I decided to use them to make a power bank with more capacity. I proceeded to buy a small power bank which comes with one 18650 battery (almost all of ...
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1answer
111 views

Charging rate for deep cycle 12v battery

I have a 75 AH deep cycle battery(AGM) and I have a battery charger with 2 modes, 5.5A for car, 2A for motorcycle, as far as I remember, lower charging rate is usually better for longer battery life ...
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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'...
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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
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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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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1answer
1k views

NiMH battery for Electric Bike

I've come into an electric bike that currently has a NiMH, 24v, 20cell battery pack. On the pack as well it says 8000mah. The previuos owner has misplaced the original charger :( The bike has been ...
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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 ...
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1answer
200 views

Keithley 2450 Charge/Discharge adjusting appropiate V and I

I'm using Keithley 2450 model for charging/discharging battery. My aim is to find charge/discharge characteristics of 100mAH 9V battery. In the following link, they have described discharge ...
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4answers
29k views

how can I try to revive this AGM deep-cycle battery which started to perform dramatically below specifications?

I have a AGM deep-cycle battery, 150 Ah, 12V: Banner "Stand By Bull" SBV12-150. 12V150AhC20. Up until recently it was working quite OK, I was able many times, for many months, to drain about 170 mA ...
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3answers
3k views

Converting variable voltage to constant voltage / variable current

I'm using solar panels + a micro wind turbine to charge a decent sized LiPo battery using this circuit - http://www.adafruit.com/products/390. The problem is that the solar/wind stuff will produce a ...
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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
995 views

MCP73833 power path problem

I'm having trouble with MCP73833. It's 1S lipo charger powered from USB. I followed this figure from application note: My schematic: Battery connectors are X4 and X5, load is connected, USB is ...
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1answer
28 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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1answer
507 views

Battery charging circuit using 12V dc generator

This is a project work of power generation from speed breaker.I am using an IBL-100SW dc motor in my project as a generator to produce power.I am getting a voltage from 3V to 18V and current of 0.1mA ...