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Questions tagged [battery-charging]

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

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Battery charging slow

I have 2 batteries connected in series (each battery rating - 3.3V and 5Ah). So the combine effect after connecting in series is 7.3V 5Ah (practically getting 7.56V in the battery)[the battery has ...
L Lawlit's user avatar
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1 answer
17 views

MCP73871 voltage drops on OUT with no external power supply connected

Problem I am using the MCP73871 to manage battery charging while supplying a load to a 3.3 V regulator. the downstream load is pulling on average 150 mA off of the LDO. Everything works fine when 5 V ...
Ethan Armstrong's user avatar
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0 answers
14 views

Disconnecting I2C from powered battery gauge IC to rest of the unpowered circuit

The LTC2944 is leaking current into my unpowered side of the circuit, cutting the traces between this IC and the rest of the circuit fixed it. Can I do the following to prevent this leakage? When the ...
Tomás Arturo Herrera Castro's user avatar
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0 answers
39 views

Theoretical equation to describe capacity fade

https://www.researchgate.net/publication/357842717_How_do_Depth_of_Discharge_C-rate_and_Calendar_Age_Affect_Capacity_Retention_Impedance_Growth_the_Electrodes_and_the_Electrolyte_in_Li-Ion_Cells I am ...
risa's user avatar
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1 answer
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Is my lead acid charging circuit fine?

I would like to ask for review in my schematic circuit for charging lead acid battery with following data: 6 cells per unit (1.75 V per cell), float charging voltage between 13.7-13.9 V, maximum ...
user1085907's user avatar
0 votes
1 answer
28 views

Is it possible to get a dual supply from 2S Li-ion battery which has a battery protection IC connected to it

In the image below, can the node connecting cell 1 and cell 2 be used as ground and PB+ as the positive rail and PB- as the negative rail? Those positive and the negative rails will then be regulated ...
Pranav Agumbe's user avatar
0 votes
1 answer
92 views

Battery pack won't charge because it reads 4.2 V

I salvaged a battery pack from an IP camera and I want to know if it's in good shape to use for other stuff. The packaging indicates a nominal voltage of 3.8 V and a capacity of 5000 mAh. I assume it'...
arielnmz's user avatar
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1 vote
1 answer
43 views

Solar panel used to trickle charge four 12 V batteries

I am attempting to use a solar panel to charge four 12V AGM batteries. These are connected to batteries on quad bikes. We are hoping to allow them to trickle charge while they are in the garage. The ...
Samantha Garcia's user avatar
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0 answers
16 views

Simple circuit to charge and balance 7.4v li-ion battery (2s) 2x 3.7v cells in series

I am looking for a simple circuit to charge and balance 7.4v li-ion battery (2s) 2x 3.7v batteries in series, and also with over-charging, discharging, current protection I have found many circuits ...
Seb123's user avatar
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0 answers
29 views

How can I switch between battery tracking mode and input voltage regulation mode on the BQ24210?

I'm trying to create a circuit in which a BQ24210 automatically switches between charging a battery via battery tracking mode and charging it via input voltage regulation mode. This is done by having ...
gins123's user avatar
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1 answer
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KiCAD PWR_FLAG issue on DW01A circuit

I am building a TP4056 based battery charger circuit on KiCad. The ERC check throws the error as per the screenshot. Do I need to add the PWR_FLAG on VBAT- and VBAT+ nets as well or is there any other ...
Rakesh Mehta's user avatar
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0 answers
29 views

How can I improve this smart 12v battery charger circuit? [closed]

I am a beginner so I need help on figuring this out I got it in this condition but I think by fixing it will help me learn a lot I've built a few things with success and I've worked on many electrical ...
Pipesmith's user avatar
0 votes
1 answer
45 views

LiFEpo4 issues and concern

I have a 200AH LiFEpo4 battery and I bought an inverter, my inverter has 4 output AC socket if I connected the 1st socket to airconditioneer and and the 2nd socket to the charger continue charging ...
LOVE-LIGHT LIFE's user avatar
1 vote
1 answer
35 views

Load cycler circuit analysis

Hello I am attempting to build a simple load cycler that will charge and discharge 3.7 V 18650 batteries for a certain number of cycles. I would like to program it to do something like this: I'm not ...
risa's user avatar
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3 answers
100 views

How to measure battery voltage during charging?

I have a slight confusion regarding the battery. Suppose I have to charge a battery of initially 12V to 14.2V (full charge). My charger has open circuit voltage of 15V. When I connect it what voltage ...
kam1212's user avatar
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Creating a 12.6 V 3S Lithium-ion Charging Circuit from 5 V USB-C

I have some questions about what is considered standard for a charging circuit, as this is something I have not much experience in. I am constrained to the following: 3S lithium-ion battery of 2600 ...
Kevin Lupercalia's user avatar
4 votes
4 answers
797 views

Impact of high-power USB-C chargers on Li-ion battery longevity

Context: I have a 24 Ah 65 W power bank. I use a USB-A 5 W charger and it takes over 12 hours to charge it. Considering buying a more expensive USB-C fast-charger + cable, as this power bank can take ...
DansAltamira's user avatar
0 votes
1 answer
41 views

Protection against inrush current on battery charger

I'm designing a PCB for a battery powered robot. This battery must manage both the charge of and discharge of a 8S (29 V nominal) Li-ion battery. The voltages of the application cause big inrush peaks ...
Pablo Daniel's user avatar
0 votes
2 answers
65 views

Charging a battery using solar panels, and IV curve of the solar panel

I am aware that a solar panel has a fixed IV curve, and the load resistance can move the operating point of the solar panel along the IV curve. If a solar panel was used to directly charge a battery ...
siyunlee's user avatar
5 votes
1 answer
1k views

Why we can not recharge alkaline batteries to their former voltage values

When a 1.5V alkaline battery drops to around 1V, it is usually insufficient for the operation of most battery-demanding technological devices. Couldn't batteries that have fallen to 1V and are now &...
kaan's user avatar
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0 answers
43 views

How to design a battery charging circuit for solar panels and USB

I'm working on a low-power project using an esp32 and an e-paper display which will be used indoors. It uses a lithium ion battery. I want to harness solar power so the battery has be manually charged ...
uzumaki's user avatar
  • 195
1 vote
1 answer
62 views

How would I go about supplying the measurement circuit with multiple batteries ouputting microAmps of current

If I am doing a test for lithium-ion batteries where I am trying to measure a small current when I apply a small load (on the order of microAmps) How would I go about using this same current to power ...
rel's user avatar
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0 answers
39 views

Switching between two power sources and charging a battery pack

I am designing a circuit, which can use either the power from the normal socket (230V) to charge a battery pack and power a arduno uno R3 at the same time when a spst switch is on. When the switch is ...
Mario Gabriel Radu's user avatar
0 votes
1 answer
51 views

Is it safe to use a battery charger with an output voltage higher than the battery voltage? [closed]

I apologise in advance for any erroneous or obvious points or terms I may use. I have a Remington beard grooming razor, which originally contained a 1.2V 700mAh NiMH rechargeable AAA battery, which ...
jimjamz's user avatar
1 vote
2 answers
78 views

Would thermal vias under an Inductor be effective at dissipating heat?

I'm designing a BMS board that will be capable of charging my 1S2P battery back. I'll be using the 21700 Li-Ion cells, which will mean my batter pack will have a total capacity of 10000 mAh. The ...
J. Street's user avatar
1 vote
1 answer
98 views

Can I charge multipe 18650 lithium cells at fixed 4.2?

This question is edited. I am currently working on an emergency light and I want to power it with 4 18650 cells in parallel. I've tried using TP4056, but that is really slow. It takes well above 10 ...
Saad Nisar's user avatar
0 votes
0 answers
39 views

Is a Voltage Sensitive Relay (VSR) inherently flawed?

A VSR is described by Jaycar: This device will allow two batteries to be charged from your engine alternator at the same time. When your engine is on and the start battery is sufficiently charged the ...
Ken Mercer's user avatar
0 votes
0 answers
32 views

USB-C module configuration pins in parallel connection

I have received a lot of help from several members of this site. After trying to wire two charging ports on the same device and investigating the diode OR-ing configurations and the power mux ...
condor12's user avatar
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0 votes
1 answer
51 views

Question about DC pin in USB C module. Is it possible to connect two USB C and Micro USB connectors in parallel to charge the same battery?

Good morning everyone, I received help from several members of this page regarding my goal of adding a USB-C connector to a tablet that already has a micro USB connector for charging. After ...
condor12's user avatar
  • 145
2 votes
1 answer
65 views

How to turn a home battery on or off based on net voltage [closed]

sorry in advance for this probably trivial question. I'm not much familiar with EE yet. My parents are running a farm in the Netherlands, but during milking in winter, the voltage gets so low that ...
RikH's user avatar
  • 123
0 votes
0 answers
85 views

What is the correct way to drop voltage in circuit?

I designed the schematic shown below for my automotive GPS tracker. Here I used diodes for dropping the voltage. Main regulator D17 used for 5 to 3.8 V approx. Auto bat circuit D7 used as 4 - 3.8 V ...
Ashu Tamar's user avatar
1 vote
2 answers
142 views

Device is not charging (how to test ic)?

I have this USB-C rechargable vacuum cleaner. But 2 months after I replaced the battery for a bigger one (from 1500 to 3000 mah 18650) it is not charging anymore, it used to charge with the latter ...
Panamanian's user avatar
-1 votes
0 answers
48 views

Schematic review of lipo charger

please review my schematic for battery charging
Poupiloup Polpy's user avatar
0 votes
1 answer
94 views

How does a circuit with dual charging ports actually work?

I have a tablet for which I replaced the charging connector from micro USB to USB-C using a PCB module with a USB-C connector. Since there was no space on the PCB to mount the new connector, I had to ...
condor12's user avatar
  • 145
1 vote
4 answers
97 views

Why USB-C plug doesn’t charge? [closed]

I have multiple USB-C 5V chargers of the same type that do not charge connected android devices. Devices detect charging if these are turned off, but when turned on, no charging icon of any visual ...
kamillabaarnowak's user avatar
1 vote
1 answer
60 views

How can I protect a DC/DC converter when VIN is floating?

I'm using a L6902 (https://www.st.com/resource/en/datasheet/l6902.pdf) to charge a 4 cell lifepo4 pack (with a solid BMS). Do I need a diode on the converter output (PACK+) to prevent the converter ...
alexlroemer's user avatar
0 votes
1 answer
43 views

Does this battery pack allow load sharing setup?

I would like to use a pre-assembled 12V-rated LiFePO4 battery pack such as the one advertised here. Due to nature of intended use I'm currently focusing on a charging setup where the load is connected ...
lucenzo97's user avatar
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0 votes
1 answer
54 views

Are the data pins necessary on a mini USB connector used only for charging a tablet? Is the ID pin used for OTG?

I have an older tablet, and I plan to replace the charging-only micro USB connector (which does not transmit data) with a USB-C connector. However, upon examining the pinout, I noticed that the two ...
condor12's user avatar
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0 votes
0 answers
45 views

batt charger [IMAX B6] - force to charge when LOW VOLTAGE

The Imax B6 battery charger refuses to charge batteries when they are below certain values, and it is highly recommended and safer for users. However, certain times I need to force the load and accept ...
Daniel Perez's user avatar
1 vote
2 answers
110 views

ESP32 PCB Review [closed]

I am currently designing a PCB to be manufactured. This version is my attempt at a working prototype. I am new to PCB design but am open to accepting any help I can get! My part is meant to function ...
AmateurEnthusiast's user avatar
1 vote
2 answers
105 views

What is the size (weight, capacity) of a battery able to absorb 10 kW while charging?

Due to some existent surplus of power generated by an electric generator, I need to find a battery able to absorb about 10 kW while in charging mode. The capacity of this battery does not really have ...
Robert Werner's user avatar
0 votes
1 answer
68 views

LiPo charger with load sharing

I'm trying to make a LiPo charger + load sharing module that is mostly based on the popular TP4056 charger modules, this is my schematic: I've made the prototype and the charging and protection part ...
Razero's user avatar
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0 votes
2 answers
149 views

Can I charge my 3S2P 18650 battery (12.6v) with a normal 12v power adapter if I use a BMS with built-in balancing+protection? [closed]

First off, I would like to stress the fact that I am no electrical engineer or anything of the sort, just a hobbyist that is into this kind of stuff. So please bear with me, as I know a few things ...
Respoda555's user avatar
0 votes
1 answer
63 views

Output Voltage Feedback Circuit interpretation

I see reference design of Texas Instruments PMP40766 Universal input, 500-W CC/CV e-Bike charger reference design , In the design I don't understand the reason of diodes at the feedback circuit I ...
MSB's user avatar
  • 27
0 votes
0 answers
38 views

Modifying Li-po and NiMH batteries

I have three 2s 7.4V LiPo batteries, two balance LiPo chargers that can charge 7.4V/11.1V 1s-3s batteries, and soldering tools lying around, so I'm wondering: Can I convert the three 2s 7.4V batteries ...
Beachy Boys's user avatar
0 votes
1 answer
68 views

Battery Charging Circuit - What is the operational analysis of device Q1?

simulate this circuit – Schematic created using CircuitLab V1 is a 24 volt dc 210 milliamp power adapter. V2 is a 14.4 volt nominal nicad battery in a handheld vacuum. V1 is almost 30 volts open ...
SystemTheory's user avatar
0 votes
1 answer
98 views

Strange resistor in battery charger

I've opened drone battery to take a look at built-in charger. The schematic based on LTC4054 is straightforward, except for one part. There seems to be 2 Ohm resistor (30Y) connected in series with ...
Maple's user avatar
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0 votes
1 answer
173 views

Lithium iron phosphate battery charging for single and multiple 12V 7Ah batteries

I want to charge my lithium battery as shown below, but I first want to explore going down the route of making my own PCB before I decide to buy an off-shelf device. I want to charge the battery at a ...
JoeyB's user avatar
  • 2,391
0 votes
2 answers
79 views

Bipolar 2s1p Li-ion array BMS and charging

For powering my portable circuit, I need a bipolar power supply of ±2.5 V. The circuit is low-power, but requires very precise power. For its stabilization, I am using ADM7154 regulators for positive ...
nighma's user avatar
  • 3
-1 votes
2 answers
55 views

Is it okay to raise the output voltage of a 5v charger to charge a laptop battery whose charger supplied 15v (with a step up module) [closed]

I have a small 5v 2A charger, I would like to charge and use a laptop battery(for projects) which the laptop it belongs to is destroyed beyond repair, so I can't charge it in the laptop and the ...
Daniel Alemu's user avatar

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