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
67 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
18 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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0answers
26 views

How to increase charging current above 1A in TP4056 [on hold]

I'm trying to create a Lithium Polymer battery charger that will charge a high C-rating LiPo at 6A - I want to use the TP4056 for simplicity, but the idea of using 18 TP4056s to charge three LiPos is ...
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1answer
101 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
28 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
26 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
36 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
46 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
25 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
195 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
28k 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
83 views

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

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
46 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
972 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
24 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
483 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 ...
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2answers
84 views

Charging 3.7 V Li Ion battery with 5 V DC

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
44 views

Using 8 micro farad capacitor in place of 12 micro farad capacitor

I have a samsung fast charging charger. Both of it's capacitor fused after an electrical fluctuation. I'm unable to get 12 micro farad, I was able to get 8 micro farad capacitors. Cuz the place which ...
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0answers
26 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
71 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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1answer
109 views

24v output from two 12v batteries in series, charge them with 12 volts in parallel

I have a solar charge controller which can charge 12volts batteries. I have two 12 volt batteries which are connected in parallel. I need to have 24volts output without using dc-dc step up converters. ...
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0answers
62 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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1answer
2k views

Connecting multiple batteries to a battery tender / trickle charger

I have multiple 12V batteries, some small ATV starter batteries (12Ah and 9Ah) and some deep cycle (120Ah and 97Ah). Can I connect all those batteries to the same battery tender in parallel? Could I ...
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3answers
94 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. ...
2
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1answer
617 views

Li-ion battery calibration technique

As you know the li-ion batteries have flat voltage curve and it is not possible to detect battery state of charge (SOC) from voltage accurately. We use fual-guage which measures the accumulated charge....
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0answers
31 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
2k views

How does charge/discharge current increase battery temperature?

I already know that charging or discharging a battery causes it to heat up, and that increase in heat is proportional to the current. But what physical process is behind this? My back-of-the-envelope ...
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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 ...
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3answers
5k views

Charging a car battery with two chargers simultaneously

My car, which has a 12 V silver calcium battery, is flat and I would like to get on the road as soon as possible. I got two car battery chargers that are not identical, but both can operate at 6 ...
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2answers
1k views

If I have two 18650 Li-ion batteries with different capacities, can I charge them using the same circuit?

I have several 18650 Li-Ion batteries, many with different capacities. Can I charge them with the same charging circuit (5 to 3.7 V 1 A buck converter)? Can I put them in parallel and use the same ...
6
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1answer
680 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 ...
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1answer
409 views

MOSFET switch between parallel batteries for dual charging

UPDATED: I am developing a wireless device composed of : 2 Varta CP 1654 A3 Li-Ion 3.7V 120mAh (supporting 2C charge) with protection circuit module 2 MCUs that can handle Li-ion CC/CV charging My ...
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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
51 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 ...
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2answers
68 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 ...
2
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1answer
5k views

TP4056 lipo charger output voltage

for a project I'm looking for a charging solution to charge a lipo battery, while at the same time being able to power a microcontroller with 3.3v. For that purpose, I bought a few TP4056 boards that ...
2
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1answer
712 views

Proper way to recover 18650 cells from laptop batteries

I'm looking for a tutorial on how to recover 18650 cells from laptop battery packs. Like what should I do, and what should I not do, how to test them to see their condition. The way I'm doing it now ...
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2answers
1k views

Do I need to fuse batteries in parallel?

I have two deep cycle batteries in my Airstream, in the panel there is a fused bus bar (that appears to be faulty) so the solar panels only charge the one battery. Can I just run a heavy gauge wire ...
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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 ...
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1answer
790 views

BMS for Li-Po with balancing and protection

I want to build a robot based on Raspberry Pi with Raspberry Camera. It will use tracked car chassis to move around my flat. I'd decided to use 3-cells Li-Po battery to power this robot (because of ...
1
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1answer
442 views

TP4056 and Lipo batteries

I have several 3.7V 1800mah and 700mah Lipo batteries that also have the 8205A MOSFET and DW01a chips mounted to the top. I've seen the two types of TP4056 boards (one with these two chips for lipo ...
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2answers
8k views

Can the terminal voltage of a lead acid battery be reversed?

I recently acquired a used riding mower. I figured it was dead, so hooked it up to a trickle charge overnight. Next morning, still totally dead. I stuck my voltmeter on it, and measured -11.8V. Check ...
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2answers
151 views

Smartphone internal charging circuit type and efficiency

USB usually provides 5V (or even more, for example 9V with Qualcomm Quickcharge) and the phones contain a single li-ion cell with 3.5-4.3V, so there must be some dc-dc converter in between. I wonder ...
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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 /...
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1answer
118 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 ...
2
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1answer
1k views

Batteries connection to load and charging port for DIY bluetooth speaker

it is my first question here, so I hope to write this in the right way. What I'm trying to accomplish is buidling a battery powered bluetooth speaker. In order to do it I'm using the following parts: ...