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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Is tp4056 protection absolutely necessary?

My Battery has over-charge,ovedischarge and over current detection properties. So,Do I need to use the famous protection circuit as an extra? What is the advantages or disadvantages of this situtions? ...
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Is there any shortcut to wireless charging, preferably Qi compatible or NFC?

Qi charging is awesome, can push a lot of power from the sender to the receiver, enough to quite rapidly charge a mobile phone. I do however find the circuits to be very advanced and involve a lot of ...
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Charge a 12V 90Ah led acid battery using 12V 20A SMPS

Let's assume I have a 12V 90Ah battery and 12V(15v max) 20A SMPS. I want to use this SMPS to charge the battery. I heard that 1/10 of the battery current is good to charge the battery. So that means ...
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Noise in measurement

I'm having a problem when I measure a voltage from a lead battery. I provide my circuit so you can understand better whats happening. For example I measure a 24 V battery, goes to a resistor divider ...
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2 answers
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Charging two 18650 batteries separately but using them in parallel in one circuit

I want to build an external charger for 18650 batteries. I want to use the TP4056 module in order to do that. I just want to charge one single battery with that. So this charger will have a single ...
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Is using a non-balance protected lithium-ion battery ok?

I am building a project where I use 4 stepper motors. Since they require a lot of power I am considering using a Lithium-Ion battery for them. This is what I was looking at: https://www.onlybatteries....
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Charging only the first battery in a series

I have a series of three 3.7v 600mAh LiIon batteries powering a ca. 12v circuit. Currently, a DPDT switch rewires them into a parallel configuration when I charge them–each battery with its own ...
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How to measure the voltage of battery while charging?

I want to design a battery charger. I need know the voltage of battery to calculate the state of charge (SOC) of it, but if I just put a voltage measure model in parallel, it will measure the charger ...
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What is the middle contact in a NP-F battery for?

I have bought a set of Sony NP-F compatible battery and charger, and one thing puzzles me: The battery seems to have two Lithium Ion cells in series (8.2V), and the charger has two contacts for the &...
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TP4056 STDBY or CHARGE COMPLETED PIN PROBLEM

I have charger circuit TP4056 based. My battery capacitY is 1100mAh(LIPO). Charging current is 580mA according to datasheet that has R9. While I am charging the battery, i read 0V from BAT_CHG pin. ...
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Can I use a PWM solar controller for charging a 24V battery from a 50V solar panel

I have a 460W solar panel with 50 Voc (open-circuit voltage), and a 24V battery bank. I'm thinking of using a PWM (60A) controller to charge this battery bank. My understanding with PWM is that it ...
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Is it acceptable to connect a car battery and an AGM battery in parallel?

I power a 12V fridge in my car either via the car battery (when the vehicle is running) or via an AGM battery. There is an Anderson outlet in the car connected to the car battery to which I attach a 3 ...
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Inverter battery charging [closed]

If I connect a battery charger to my inverter AC output to charge the inverter's battery ,can I get a continuous power supply?
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Charging Power Banks from Electric Car Charging Stations (DIY, LiFePO₄)

Is it possible to charge my own Lithium-Ion Battery Bank from pay-to-use Electric Car charge stations? I’m traveling in an (ICE-powered) caravan. I have a 0.7 kWh Lithium-Ion Battery Bank and a 100 W ...
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Problems with MAX712CSE+T FASTCHARGE functionality (12 cell series NiMH 3000mAh 14.4V battery)

I am trying to make a battery charging circuit for the iRobot Create 2 using the MAX712CSE+T part. The battery (according to its packaging) is a NiMH with 12 cells, 14.4V (although I measure closer to ...
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Two battery control

I have two Li-ion batteries in my system. (7.4 V 12000 mAh and 7.4 V 2200 mAh; also they have BMS). The larger one of the batteries can be easily removed and installed from my system, so I can charge ...
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Li-ion End of life

What will be the reason for reduced capacity of Li-ion cell at End of life? What will be the nature of voltage at EOL with respect to BOL? Will it be still reaching something like 3.65 or 3.7?
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Why is this LM317 giving an unexpected output?

Just for fun, I used an LM317 IC with two resistors (1.5k and 470 ohm) to get an output voltage of around 1.8 volts and used this circuit with a wall clock. It worked amazingly well when I connected ...
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Charging batteries with both an inverter and solar panels

I have an inverter, a battery bank, a PWM solar controller, and some solar panels. The inverter also supports charging the batteries from the mains power. So if I just plug the inverter into a wall ...
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How does this circuit convert AC to DC? [duplicate]

I'm trying to understand this circuit taken from a rechargeable flashlight. There's a 4V sealed lead-acid battery (not shown in the images) that gets charged when you connect the flashlight to 230V AC....
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Charger for a 32650 LIFEPO4 BATTERY PACK 4S2P 12.8V 10AH -12AH

Good day. I ordered a 4s2p LIFEPO4 battery online and it odes not come with a charger. I'm wondering what specific kind of charger do I need for this battery. Specs and the link of the battery are ...
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1 vote
1 answer
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NiMH battery charging rate vs life

I'm looking at the product info of a NiMH AA battery brand. It says these batteries last up to 2100 recharges while charged as per IEC 61951-2 2011, but they last for only 600 times if recharged using ...
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9 votes
3 answers
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Is it okay to charge a deeply discharged Li ion cell below 1V?

I accidentally discharge my lithium cell to 0.45V. Is is okay if I try to revive it by charging with 10mA of current till it reaches 2.5V? cell capacity is 4000mAh.
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TP4056 DW01A Problem

I have TP4056 with protection circuit. In charging, Everything is OK. OC : VDD - VBAT OD : VDD - VBAT While the battery is charging, the circuit continues to work on the battery when the charging ...
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Battery charger schematic review

I have designed this circuit to charge a 7.2V battery (linked below), and I just want to make sure I did not miss anything before I go an get it manufactured. My main questions are: will that PFET I ...
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17 votes
3 answers
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What does an EV "wall socket charging cable" do?

Known as "Mode 2 charging", this method of charging electric vehicles describes the use of a common household wall socket and common mains voltage (230 v) to charge the vehicle. This is ...
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Level shifting of a 3 state pin

I want to design a simple battery charger using MCP73831/2. This chip has a 3-State state pin according to the table below: I have a 3.3V MCU and I want to connect this pin to a GPIO. The MCU is not ...
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Preventing reverse currents in a NiCd pack during deep discharge

One of the issues with 2s, 3s, 4s, etc. battery packs is that as the pack discharges it's possible for one cell (the one that depletes quickest) to become reverse biased once its internal resistance ...
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2 votes
2 answers
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Is swapping lion batteries (of same voltage, different capacity) on wireless headset going to affect anything? (charging, etc)

My wireless headset had a 400mAh 3.7V battery in it which was very low quality and ended up lasting very little. So, I replaced it with a 1200mAh 3.7V battery. The 400mAh battery had a protection ...
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1 answer
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How to charge two 12V batteries in series with a 12V charger

I have setup the following circuit in my home. There is a logic circuit, (NodeMCU) which operates a relay, which causes it to activate the electromagnet. simulate this circuit – Schematic ...
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Utility engineer trying to understand electric vehicle charging when the car is getting "topped off"

I'm an engineer trying to understand the impact electric vehicles will have on service transformers and other customer facing grid equipment. I'm mainly interested in the energy consumption profiles ...
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1 vote
4 answers
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Does a low-enough leakage-level battery discharge cause highly asymmetric cell discharge?

A Tale of Two Batteries This is concerning two different 6-volt lantern batteries that have behaved the same exact way (I believe.) Here is a datasheet for the type of battery, a Rayovac # 941 ...
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1 answer
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CN3722 External MOSFET heating up

In my charging circuit, CN3722 is used as the charging controller where I'm using an external MOSFET FDS4435bz as per it's application. Earlier I was using DMG2307L-7 which was heating up(50°C). To ...
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2 votes
1 answer
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Frequency reading 180 Hz on only one line to line measurement in three-phase backup 60 Hz LP gas powered generator in idle mode

I am running into an issue I don't understand why is happening. I have found how to "fix" it, but I am interested in ideas on what the actual source of the issue is Short version: I have a ...
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3 votes
1 answer
67 views

Simple wireless charging standard as used in toothbrushes?

I have a project that requires wireless charging of a small hand-held controller with a single 1S lithium-ion cell. People's initial thought was to use the standard Qi mobile phone chargers to save ...
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How to design EMI filter if you don't have the actual physical circuit ready?

I have a designed a battery charger in simulink and for the sake of completeness and as a learning experience, I would like to explore EMI filtering and design one for it (as a simulation model). I ...
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1 answer
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Want to charge 24 VDC 600 Ah Li-ion house battery with overflow of 12 VDC 600 Ah AGM battery

I recently installed a 24 V lithium-ion battery and new inverter charger for house power on catamaran but left 12 V AGM batteries connected to separate DC system which also is charged by solar, wind ...
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3 votes
2 answers
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How does this circuit work? (24 V lead-acid charger)

How should this circuit be controlled to ensure that the backup battery is properly charged? The battery is a 24 V lead-acid battery. This is a circuit diagram of a UPS device. A PWM signal is ...
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4 votes
1 answer
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Solar panel for 6 V, 1100 Wh battery

I have a sensor in a remote area that draws 15 mA @ 6 V for 16 hours each day, powered by a 6 V, 1100 Wh low discharge battery. I'm trying to achieve around 2 years of autonomy. Daily consumption is 1....
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-1 votes
1 answer
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I have a variable input of 3V to 12V. How can I get a constant output of 5 volts?

In my project, I have an input of 3 volts to 12 volts DC, but I need a minimum 5 volts DC. If I use a 7805, it will not work under 7 volts. If I use a boost converter or buck converter, I can't ...
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2 answers
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Can I use a constant voltage and constant current LED driver to charge a battery?

I can charge a battery with a bench power supply by setting desired voltage and current. Is it possible to use, for example, this LED driver in the same way? I just want something cheaper, more ...
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How to calculate watt hours gained charging battery?

I need an estimate of how many watt hours a battery has gained after charging to a certain number of volts. With a 12 V, 50 Ah lead-acid car battery, charged from 12.5 V to 13.0 V, is it as simple as ...
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What is the difference between MCP73833-BZI and MCP73833-FCI

These are two variants of the same battery management ICs, I think they have different parameters, but I'm not sure how to interpret them. From the datasheet these are the specs difference: I have a ...
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Is this current and resistance OK for this CC-CV IC and battery?

I want to charge/recharge this battery in 'fast charge mode' which corresponds to supplying a 60 mA of current using this IC which (according to the equation on page 15 of the IC's datasheet) requires ...
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What is the mathematical equation/function for lithium ion battery recharge time in the constant-voltage phase?

I'm trying to program a simple two phase battery recharge model in Python where the constant current (CC) phase is linear with respect to recharge time and state of charge (charge capacity). However, ...
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How to charge properly 3S Li-Ion battery pack?

I'm building a 3S 18650 Li-ion battery pack, which will be used for fast charging and discharging. Unfortunately, I can't find a 3S battery charging board that is commercially available. I found out ...
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How to implement current-based charge termination for lithium

Despite much searching, I've been unable to find a good charging solution for my lithium battery project, so am wondering if I'm misunderstanding something. My application calls for a 4S battery (no ...
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Can I charge a 4000 mAh Li-po battery with a single TP4056 module?

I bought a single 4000 mAh lithium-polymer battery and connected a step up converter and TP4056 module. I am providing a circuit image; the only difference between the image and the actual circuit is ...
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2 votes
2 answers
570 views

How does a hobby charger work?

As far as I understand, a hobby charger - for example to charge a pack containing 4 batteries in series - is wired as so: That is, with a heavy gauge "power" connector wired across the ...
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How fast does a 65 watt charger actually charge the batteries?

My laptop (A thinkpad t440s) has a 6-cell battery: three pairs of 18650 batteries in series, for a total of about 11V. My charger is 65 watts at 20 volts, which works out to 3.25 amps. My question is, ...
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