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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0answers
18 views
What kind of charger do I need for a 2 cell 7.4V LiPo battery?
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
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0answers
20 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
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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
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3answers
69 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
40 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
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1answer
33 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
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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
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1answer
28 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
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2answers
61 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
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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
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0answers
13 views
How to Power Multi Lipo Charger [closed]
So this is pretty straight forward. I'm pretty new to the RC community and I'm currently flying a quad that uses 1500 mAh 3s 25c 11.1v batteries.
I have 5 of these batteries because I burn through ...
0
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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
96 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
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1answer
36 views
Rechargeable battery datasheet
Some parameters on the datasheet are a little bit confusing. What does the datasheet mean?
0
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1answer
45 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
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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
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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
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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
51 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
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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
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0answers
32 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
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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
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0answers
72 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
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0answers
95 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
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0answers
37 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 ...
0
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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
114 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
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1answer
59 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
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0answers
29 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
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1answer
94 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
40 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
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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
70 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
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1answer
54 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
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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
49 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
60 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
29 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
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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
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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.
...
0
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2answers
112 views
Two 5V2A powerbanks draw different current under same conditions?
I have 2 different powerbanks, both have 10000 mAh and both are rated for 5V 2A power input.
I have noticed that they draw a different amount of current despite using the exact same charger (5V 3A), ...
1
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1answer
27 views
Increase working hours for an external speaker
I have an external speaker which uses one 18650 cell (3.7V). I would like to increase the working hours by adding one more cell of the same type.
I have two questions:
Should I add the second cell in ...
