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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).

2
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1answer
43 views

Why is there a maximum charging current much lower than maximum discharging current on a li-ion pack?

I will have soon an electric scooter with a 60v (top 67.2v) and 35ah battery pack. As it is designed, it can be charged by one charger which pumps 2,5 amps or it can be charged by 2 chargers in ...
0
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0answers
29 views

US/Can - Maximum current in a single circuit in a 100A panel

I hope this is the right sub... I have a 100A pony-panel in the garage. I'd like to have someone add a wall plug for EV charging, ideally a 14-50, but I'd settle for a 14-30 if need be. I seem to ...
1
vote
1answer
30 views

LiFePO4 cells - self-balancing in series or parallel?

I am building various banks / packs from individual prismatic LFP cells, nominal 3.2V each. New and pretty large, 60-400AH. I have a good power supply, charge each cell independently, Bulk stage CC ...
-1
votes
0answers
21 views

What kind of charger do I need for a 2 cell 7.4V LiPo battery? [on hold]

I have a 7.4 Volt 2 Cell LiPo battery, but I do not yet have a charger. I am new to electronics, and do not understand many of the specifications and what-not. What kind of charger, with what specs ...
0
votes
0answers
22 views

Programmable Charging controller for Li-ion/Li-Po [on hold]

I'm looking for a programmable charging controller (or set of ICs), that resembles laptop battery controllers. It will go inside of a battery pack with a small MCU and EEPROM. Critical features: 0) ...
0
votes
1answer
40 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 ...
0
votes
3answers
76 views

Alternator current when charging flat battery

I've found some voltage-current-rpm graphs for car alternators and did not quite understand one thing. Basically, my alternator is rated at 75A (small car), which it should output above 2000 RPM or so....
1
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2answers
42 views

“Safe” (but slower) charge method for AGM batteries?

My understanding of AGM vs flooded lead acid (FLA) batteries is that FLAs like to gas/outgas but AGMs do not. It is pretty much a requirement to increase the charge voltage of FLAs so that they gas ...
0
votes
1answer
35 views

Using solar power on a dual inverter setup simultaneously, that share different parts of a series battery bank

I had an idea and wanted to present it here and ask if anyone foresees any problems with doing this... I have both a 48VDC input inverter and a 24VDC input inverter that I want to run from a 72V ...
0
votes
0answers
21 views

Damaged (auto) battery charger - which component most likely? [closed]

I recently (stupidly, in the dark, late at night) mistakely connected my auto battery charger in reverse. The current flow from the alternator did some damage to the charger. Before I begin ...
1
vote
1answer
34 views

Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: ...
0
votes
2answers
62 views

How does USB port on a power strip detect the optimal current output?

I am looking to buy a power strip with USB ports and came across this one online. The description says "Top-notch USB smart charging technology which can detect and deliver optimal current output up ...
0
votes
0answers
31 views

Touch screen smartphone stops working during charge [closed]

Goodmorning everyone, I'd like to ask a question about a fact that happened yesterday. While I was charging the smartphone through an "unofficial" charger, I've noticed that the touch screen stopped ...
0
votes
0answers
17 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 ...
0
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0answers
16 views

What happens inside a battery connected in parallel to a load and MPPT solar charger?

This seems like a common configuration: connecting solar panels + MPPT charger to lead-acid batteries which are also connected in parallel to an inverter. Assume that, momentarily, the battery has ...
0
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5answers
97 views

A basic question about amps, watts, and charging batteries

Why do we speak of watts (and not amps) when we refer, for example, to the "7.5W Wireless Charger for iPhones," but when we talk about cord-based USB charging, the specs typically refer to amps (and ...
2
votes
1answer
97 views

Why are(n't) rechargeable batteries damaged by partial charging?

Over the years, I've come across websites and people with different opinions on the "correct" way to charge rechargeable batteries (I'm more concerned with laptop, tablet and phone batteries than with ...
0
votes
1answer
37 views

Rechargeable battery datasheet

Some parameters on the datasheet are a little bit confusing. What does the datasheet mean?
0
votes
1answer
46 views

Can I use 220V inverter as 12V power supply?

I have a pure sine wave inverter, it charges a 12V battery and converts 12V from battery to 220V during a power cut. Since it can output 12V to charge the battery at quite a high current I was ...
0
votes
2answers
57 views

How can I separate 2 power sources so only one can flow at a time?

I am building a battery charger circuit that can recieve power from 2 sources. However I need to avoid both sources from supplying power at the same to prevent any electronics from being damaged. So I ...
0
votes
2answers
44 views

How can I use a US 120 volt Ryobi charger From a 220 volt main? [closed]

I bought a ryobi kit in the us and I want to use it in in Europe. I doubt that I can plug it directly into the socket, what kind of converter/adapter do I need? Is there a way to adapt the charger ...
0
votes
2answers
26 views

Charge AGM battery from car alternator

What is the most efficient way of charging an AGM battery using a car alternator? I have a 12V plug connected to alligator clips which can be used in the 12V sockets inside the vehicle. Is this the ...
1
vote
2answers
52 views

Powering an onboard car GPS tracker

I made a car tracker (a GPS/LTE module connected to an arduino that communicate to my web server) to log gps positionning data. I’m planning to use this to track my new car in case it gets stolen. My ...
0
votes
0answers
23 views

What negative effect may a polyswitch have on Li-Po/Li-ion charging?

I have a single-cell Li-Po battery (3.7V 380mAh) connected to a dedicated charge controller (TI bq21040). The programmed charge current is 180mA. Although the battery is shipped with a PCB with ...
0
votes
0answers
33 views

how to compute battery charging power

I have a very basic question about battery charging power. In a very simplified scenario, assume a battery with voltage 3.7 is connected to another rechargeable battery with voltage 3.2 which results ...
1
vote
1answer
50 views

Is inconsistent charging bad for batteries?

I am designing a generator for a bench press that generates electricity when you work out, but it would charge the battery inconsistently and I don't know if that would be bad for a battery.
0
votes
0answers
73 views

What is the blue wire for on my battery? (samsung galaxy note 10.1)

I have this battery out of a Samsung Galaxy Note 10.1 and this battery has 5 wires; 2 black, 2 red and 1 blue wire. I assume that the red wires are positive and the black wire negative charge. I've ...
0
votes
0answers
100 views

Why don't electric car manufacturers use multiple chargers to handle high current charging?

I just read an article describing the multiple problems which occur when you're trying to increase the electric current transmitted through an cable to charge the battery of an electric car. These ...
0
votes
0answers
40 views

Solar Charge Controller with SMPS Power Supply

Hi, I want to charge a 2-Cell Li-ion battery (7.4 V) using CN3722 Solar Charge controller and a SMPS power supply (instead of using solar supply). I have designed my circuit to charge with maximum 1A ...
-1
votes
0answers
57 views

Power supply switching circuit design

I am trying to design the power supply needs for my project. It has 2 loads in parallel, one 12V and one 5V. I want to power it from as 12V Wall Adapter that will drive my 2 loads and charge the ...
0
votes
1answer
30 views

Operating Voltage and Current of solar PV panel connected directly to a battery

Let's assume we have a 60 cell 260W PV panel with the following STC characteristics: Voc= 38.1V Isc=8.98A Vmpp=31.1V Impp=8.37A The panel is exposed to direct sun light and standard conditions are ...
0
votes
2answers
115 views

Planned obsolescence / failure of consumer electronics / kill switch [closed]

General question for those who have worked in the consumer electronics industry: Are small rechargeable devices (like bluetooth audio devices specifically) designed to fail after a set time to force ...
1
vote
1answer
60 views

Does voltage drop with discharge?

Does voltage drop with discharge? Since voltage is the potentiality between two charges to re-balance (from my understanding). I mean, once all charges are equally shared between both capacitor ...
0
votes
0answers
30 views

Challenges to DIY a USB QC 3.0 charger for a DJI Mavic Pro @ 13V?

One of the big pain points with all of the DJI Mavic Pro drones is that they do not charge via USB. In order to charge the batteries you have to buy an AC-DC adapter which adds a good amount of extra ...
0
votes
1answer
95 views

TP4056 and li ion battery charging that never ends

I have designed a circuit with a Nodemcu ESP8266 (something similar to an arduino nano, requiring 3.3V to work) and I would like to have a backup battery to be robust to main power interruptions. So ...
0
votes
1answer
10 views

Is a bq2920x enough to protect a two-cell Li-Ion battery?

I'm designing a battery supply to go into a bluetooth speaker. Having never worked with Li-ion cells before, I've done some research and understand that they need to be load balanced and protected ...
0
votes
2answers
41 views

5V output on AAA Ni-Mh battery charger?

I bought a cheap Ni-Mh battery charger from Aliexpress to charge my rechargeable AA and AAA 1.2V batteries but before I plug them in, I checked the voltage on the charger terminals and it is reading ...
0
votes
1answer
63 views

Battery voltage drops to 0

I have this type of battery. When it was fully charged I read with the multimeter aroud 38-39 volts. Now I read 21 volts. The question is: When I connect the battery (discharged - 21,22 v) to a bldc ...
2
votes
1answer
78 views

Minimalistic RTC backup battery charging or a super-capacitor?

I am trying to provide RTC power backup for a 3.3V system that will be running at the very least 8hrs during the work day. As such I only need up to a month of backup, enough to survive over long ...
1
vote
1answer
55 views

Determining Battery Charging and Discharging Rate Based on Max Current and Nominal Voltage

I am having difficulty in figuring out some basic stuff and confused with multiple equations. I am working on a simulator which simulate a hybrid vehicle journey for some period of time. During ...
0
votes
2answers
98 views

Why does my laptop emit electromagnetic radiation when charging (only)? [closed]

I have an electromagnetic radiation detector that I've been playing with recently, going around the house and testing various appliances, and I noticed something weird. When I charge my laptop (or ...
1
vote
2answers
49 views

Piezoelectric Project

I am currently working on project involving piezoelectricity and I'm in need of some advice. I'm pretty much a beginner, but I've been doing lots of research. I just need input to help fill some gaps. ...
-1
votes
0answers
48 views

Can a rechargeable NiMH battery be replaced by a non rechargeable battery

I am looking to change a Toshiba laptop rtc battery as the current one is no longer working. The current battery is a 2.4V 40 mAh NiMH connected to the laptop via a 3 pin connector with only 2 wires, ...
0
votes
1answer
42 views

How do I know if TP4056 charging modules are faulty

I've bought 10 of TP4056 Lipo charging modules from a Chinese vendor. Tried using them in something I've built, but whenever I plug the power source in, the charge led doesn't light up. In fact it ...
0
votes
1answer
50 views

SMPS Current Sense Resistor Selection

I am looking into using an SPV1040 boost converter to charge a battery from a solar cell. The chip includes inputs for a current sense resistor, which are described in one of ST's applications notes ...
0
votes
1answer
29 views

How can I measure the charge current into a smal LiPo battery?

I have a SparkFun USB LiPoly charger that by (default) is set at 500mA. If I try and measure the charge current with my DIY multimeters, the charging LED goes out and the meter reports zero current? ...
0
votes
1answer
62 views

Automatic charging and power switch between USB and LiPo battery

I am designing a board which can be powered over USB and includes the use of a LiPo battery along with its charger circuit. When the USB is connected, it charges the battery as well as powers the ...
-1
votes
0answers
30 views

CMOS RAM battery backup charging circuit for retro computer

I've got a few retro computers that use rechargeable batteries to power a clock or CMOS RAM to preserve settings while the machine is off. Most batteries were already dead, and to prevent damage from ...
0
votes
0answers
10 views

Maximum battery bank capacity chargeable with a 2000W inverter generator

Using a 2000W inverter generator, what is the maximum capacity of a 12V battery bank that it is capable of replenishing if left on constant charge? In theory I assume that at 12V, a 2000W generator ...
0
votes
0answers
23 views

Why in consistent current for multiple TP4056 module in parallel?

I'm trying to make a charging station that charges multiple batteries independently, something like so. NOTE: THE POWER SUPPLY IS AN ADJUSTABLE BENCH POWER SUPPLY, I ACCIDENTALLY LEFT IT AS 1V. ...