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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11 views

Jeita compliance for discharge?

I know there is a Jeita compliance charging scheme for charging batteries. But is there such certification for discharging them in the function of temperature? The following is an image of the Jeita ...
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31 views

Expert advice needed on electric bike battery setup

I'm currently building an electric bike for a competition. I know I want a 15s lithium ion NCM battery (max 4.2 volts/cell), but don't have a battery management system or a balance charger than can ...
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78 views

Why are there no decent 9V block chargers?

Forgive my ignorance, I'm not an electrical engineer. Can someone explain why there apparently are no decent chargers for 9V blocks? There are two issues I would like to clarify: Normally, you can ...
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9 views

Is ESP32-Pico D4 Kit able to charge batteries out of the box?

I was looking at this: https://www.digikey.in/product-detail/en/ESP32-PICO-KIT/1904-1030-ND I read somewhere that Dev boards like this have the ability to charge batteries (LiFePO4) when connected ...
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Battery charging 1.2 Testing (BC 1.2)

USB IF has specified tests for devices with BC1.2 Ability. I am checking their original literature on the matter but it's just too complicated for my understanding. is there any link on these tests or ...
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34 views

Which cell balancing method is best to use and implement for low-voltage (48V battery stack) battery management system for E-bike application? [duplicate]

I would like to design a battery management system for low voltage systems. I am developing a BMS for a 48V, 20Ah battery pack system. When it comes to battery balancing, I am confused in between ...
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66 views

How are series connected batteries of different voltages (or even same voltages) charged “equally”?

I am trying to understand conceptually, how a series bank of batteries is charged "uniformly". Let's take the example of of six 6V AGM batteries for a 36V golf cart. The charger is 36V nominal but ...
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36 views

5-pin SMD device identification - top marking CaC9A

Please help me to find the name of this SMD device with top marking CaC9A
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28 views

Is it safe to have two batteries in series on a solar panel system with 14.22v and 14.46v?

I have two batteries in series plugged to a solar panel system. In parallel they used to balance each other perfectly. But now i'm trying to have a 24v system and I have them in series. They ...
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1answer
33 views

Which XT60 on battery?

What is the recommended plug on the battery? The male or the female XT60 and why? XT60 connector
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14.8V LiPo Battery Protection

Disclaimer: This is my very first time I have to work with batteries so I have basically no idea whatsoever. I need to protect a 14.8V LiPo Battery from overcharging/overdischarging. I have looked up ...
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57 views

Issues reading from an I2C device

I'm testing out the BQ25887 2 cell balance charging IC, and I'm trying to read the data from the I2C interface. But I'm not getting any results. I am unable to see any values from the serial monitor ...
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Is it possible to accurately calculate how long a Li-Ion cell takes to charge?

Since Li-Ion cells are charged using both Constant Current and Constant Voltage modes during their charging cycle, and the transition between these points depends on the cell voltage. Is there an ...
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32 views

PWM disables charging battery after heavy load on inverter

I have 2 batteries 12V 80Ah deep cycle lead in series for a 24V system. I connected an invertor directly to the battery pack. I have ~600W (~44V) of solar panels connected to the PWM charge ...
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99 views

How to active limit the current from a DC source

I have a source with variable power output during the time because it is shared with another devices and this source has not enough power to feed my load (a battery charger for a 1 cell 4.2V lipo) so ...
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26 views

4S 18650 Custom Charging Circuit

I hope your day goes well. I have a question regarding building a 4+S 18650 charging circuit. I have 4S1P pack with 4 batteries in series and I am trying to build a charging circuit for these ...
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54 views

Charging a 3.7v lipoly battery at less then 4.2v?

I'm trying to experiment with supplementing battery power using microbial fuel cells. MFCs are batteries that produce their charge from decaying matter, but they often only get up to 0.9v (unless ...
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Strange Behaviour of Lipo Battery ESR during charging

I performed three charge tests on a single cell 190mAh Li-Po battery with Keithley Battery Simulator instrument. Charging started at 3V and stopped at 4.20V in all tests. After completing the three ...
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Is the SkyRC B6 Nano charger suitable for charging single 18650's from 2.4v-2.6v

I have salvaged six 18650's from a laptop we've owned for years. Battery voltage: four of them are ~2.63v, two are ~2.46v I have a SkyRC B6 Nano charger (https://www.skyrc.com/Charger/B6nano). I've ...
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Will giving 9/12v to a quolcomm quickcharge device kill it?

Background I recently broke my phone's USB port (damn!), so as a stopgap measure before I can be bothered to buy and fit a replacement, I've soldered two wires to the +ve and -ve wires of where the ...
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29 views

Charging “Gel” batteries while on load

I have 300 amps 12V Gel deep cycle batteries bluged into suoer 50A smart 4 phase charger and a PC that works on a DC power supply takes around 5-30 A (15 amps most if not all the time). Now I want to ...
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1answer
17 views

BQ297xy Overcurrent protection

Can someone explaine to me how dose this overcurrent protection works and how to calculate it? BQ297xy Schematics
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1answer
46 views

How to use a (cheap) BMS for discharge only

I'm building a small robot (for the context, with a pi zero, a PCA9685 motor controller, 8 small servo motors a regulator and an Ubec) fully powered from a 2S 18650 battery. I've inserted a (cheap) ...
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Can AGM batteries sulfate if charged too slowly?

I have 8 large healthy AGM batteries, each 6V nominal and each about 230Ah. They are matched well as far as actual capacity (I have tested this recently). I was told that if after draining down to no ...
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53 views

How to calculate right current to charge 2 cell series 8.4V 4000mAh battery lipo?

I have 4000mAh 2 cell series 8.4V lipo battery I need make a custom charger I am thinking of using LT3650-8.4 2A charging Ic if I set 2A how long will it take to charge this fully /if timer is ...
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Automatically switch charging lead to highest available connection in a variable series of batteries

I have a circuit which I use to charge LiPo batteries with a balanced charger. The idea was that I want to charge up to three 2S batteries as one 6S battery without the problems related to simple ...
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1answer
57 views

How can I switch solar panels on and off with a microcontroller?

I have built a li-ion 18650 7S pack as my solar backup. It is being charged by 3*250W solar panels in series (about 105V 8A.) My charger doesn't have an option to monitor individual cell voltages. ...
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17 views

Wemos D1 Minin Battery Shield Fully Charged Notification

I would like to be able to send a notification via Home Assistant when a battery is fully charged through one of my Wemos D1 Mini Battery Shields (V1.1.0). Clearly the green LED turns on when it is ...
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1answer
64 views

Why is actual SOC of a battery actually higher than what is displayed

So I read a document today which said that a higher SOC level (around 20%) is displayed as 0% to the user in vehicles, thus reducing the total capacity of the battery. My question is that why is that ...
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3answers
61 views

How can I power a circuit while charging its Li-ion battery pack?

I'm creating a portable device that can be powered by a battery pack, or plugged in and used while charging the battery. At 4:18 in this video (shown below), it shows that the circuit can be powered ...
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42 views

Lipo Charging Circuit- Relay vs MOSFET

I am currently working on an application which will use both a Lipo and an external power source (DC). The external power source will charge the lipo as well as power the system load at the same time (...
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20 views

What is the quiescent current of the MCP73871 battery charger?

I was looking looking for a battery charging IC for a wireless device and found the Microchip MCP73871 and the TI BQ2423. Both of which do what I want, but I am not really sure about their quiescent ...
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83 views

laptop batteries charging myths - Long life OR short life

I'm very conscious about the life of battery. Some people say that don't keep plugged-in laptop all over the time and remove battery charging at 70% and again charge at 40% so your battery cells ...
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29 views

What is the recommended way to connect TP4056 charger module to NodeMCU v2

I want to power a NodeMCU v2 with a 3.7v 2000 mAh LiPo battery and charge the battery with the NodeMCU connected (i.e. under load). After looking into various forums, I ordered a TP4056 battery ...
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2answers
169 views

How to hack to limit output power of a regular SMPS?

I need to charge my 60 Ah LiFePO4 battery with a small charger as fast as possible at 14.4V. There are lots of relatively cheap SMPS in the market which are not designed for this purpose, so they are ...
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1answer
72 views

On the possibility of lead acid battery recoverability [duplicate]

I have a 6 V 4.5 Ah lead acid battery which I did not charge for the last 6 months. Now the battery voltage fell to 3 volts and then I charged it for 24 hours at 50 mA. Now when I measure the voltage ...
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1answer
63 views

Renewable based Electric vehicle charging station [closed]

I have a solar plant generating 100kw, connected to a boost converter whose output is 500V,what should be my battery nominal voltage and Capacity(Ah) and what can be the maximum current the battery ...
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32 views

Charging a LiPo Battery with 1.5V Battery

I have a lithium-polymer battery with a voltage of 11.4V. If I want to charge it with a 1.5V power source (AA battery) and I boost the voltage to 11.7V will it slowly charge the LiPo.
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1answer
47 views

Back-up battery

for a project I would like to design a system which would allow me to feed my application's logic rail from a back-up battery if the main battery would somehow stop functionioning (most likely due to ...
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1answer
56 views

Homemade LED flashlight [closed]

I want to make my homemade LED flashlight into an old utility light body. My plan is to use XHP70 LED from CREE (12V, 2,8A) and power it using 2S Li-Ion cells (6-8,4 V). My idea is to use boost ...
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1answer
36 views

Lead-acid battery charger, specific circuit, 3~4.5 Amps, doubts + recommendations

I want to build a lead-acid battery charger which can reach an average charge current of 3 to 4.5A, and start with a prototype. The charger needs to be supplied by the mains, up to 250VAC, for example....
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2answers
24 views

Esp NODEMCU powered from external 3.3v source and USB

My project supplies the NodeMCU with 3.3v from a battery source via the 3.3v input pin. I would also like to connect usb input for power and programming and to feed a small battery charger from the Vu ...
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Why are Alkaline, NiMH, and Li-ion AA measured differently (mAh, mWh, etc)?

Looking around Amazon, it seems that different types of batteries are measured differently: Does anyone know why? Li-ion are measured in mWh 1200mWh ALTIZURE (Cheap-Os) 3200mWh Deleepow 3000mWh ...
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65 views

Why are Alkaline, NiMH, and Li-ion AA measured differently (mAh, mWh, etc)? [duplicate]

Looking around Amazon, it seems that different types of batteries are measured differently: Does anyone know why? Li-ion are measured in mWh 1200mWh Cheap-Os 3200mWh Deleepow 3000mWh AmpTorrent ...
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2answers
225 views

What is the charger voltage graph while charging Lithium battery with CC/CV approach?

What is the voltage graph from the point of view of the charger while performing a CC/CV charging? Isn't a "Dedicated Lithium Ion CC/CV charger" simply "a Constant Voltage DC Source with Current ...
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76 views

Lead-Acid Battery charger using LM350 and LM301

Given the circuit below, I want to discuss some issues concerning the way the circuit works. Here is the circuit: Let me report what is wirten in the handout: The circuit furnishes an initial ...
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134 views

Looking for a explanation/cause of lithium polymer battery failure

I'm hoping that someone on the EE StackExchange could give me some insight into what is going on with some lithium polymer batteries that I have under test. The question I am trying to answer is: ...
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2answers
51 views

Battery-Full indicator LED

I am in need of your advice on a BMS design. I am designing a circuit which gets powers from battery or USB input (with Power Path management). After searching I found BQ24232 IC (http://www.ti.com/...
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47 views

USB-C Power Delivery Voltage Regulator

I don't have electrical engineering background, so please mind my ignorance on the subject. I'll try my best to describe my problem and question accurately. I have an e-cig (Sourin Edge) that has ...
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2answers
50 views

Effect of Discontinuous Conduction Mode of a Buck Converter on Charging IC

I want to use a buck converter to step down a 20VDC Input to 15V to use for a charging IC (BQ24193). The reason for this is because the charging IC I'm using won't operate with a voltage input higher ...

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