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Questions tagged [batteries]

An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy

0
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2answers
72 views

Calculate the Li-ion battery remaining capacity

How can I calculate the remaining capacity (exact or approx value) of a Li-ion battery by measuring its voltage. The battery is connected the load and i know only the battery voltage and the value of ...
0
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5answers
112 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 ...
1
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2answers
53 views

Problem understanding impedance measurement device accuracy format

I am reading the datasheet of an impedance measurement device. Its accuracy is listed as '±0.4% rdg. ±8 dgt.'. What does 'rdg.' and 'dgt.' mean? And how should I interpret the accuracy? The device is ...
2
votes
1answer
103 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 ...
8
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1answer
1k views

Is it normal for a lithium ion battery to read with a very low voltage on a multimeter?

I have a PS Vita and I suspect the battery is dead and needs replacing, as the Vita won't charge at all. But the issue could also be the charge circuit, as when plugging it in to charge the charging ...
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1answer
40 views

Rechargeable battery datasheet

Some parameters on the datasheet are a little bit confusing. What does the datasheet mean?
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0answers
28 views

Mounting Lithium Packs in Enclosures

I am planning to use a battery cell similar to the picture below in a product I'm designing. Is it ever appropriate to mount these directly on top of a PCB? (all components will be on one side of the ...
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1answer
62 views

Powering Arduino Uno with 9 V LiPo batteries

Would it be safe to use two 9 V LiPo batteries in parallel to power an Arduino Uno?
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1answer
32 views

Replacement battery voltage mismatch tolerance?

I want to try replacing a proprietary battery in an electronic of mine as a first electronics DIY project. Thing is, the stock battery is 3.6V, and the phone battery I have on hand that I would like ...
0
votes
1answer
42 views

Battery switchover circuit when battery is being charged

I would like to use two LM5050 in a typical redundant supply configuration for wall adapter and a battery. My concern is that when wall adapter is connected battery voltage goes higher because of the ...
0
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3answers
65 views

Can I put Li-ion batteries in series and discharge them at different voltages?

I need to run a pump (drawing 95mA at peak flowrate) at +14V and the rest of my circuit runs on +3.3V. To save on battery costs, I was thinking of purchasing four 18650s at 3.6V 3500mAh per cell and ...
1
vote
1answer
35 views

Arduino battery power stay on for button - Not quite working

I have been trying to get a circuit to work that would power an Arduino from a set of 4 18650 batteries. It needs to turn on with a button press, then stay on for 30 seconds, then completely power ...
1
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2answers
65 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 ...
3
votes
2answers
1k views

Using 5 V adapter to power 12 V cordless phone

I am trying to power a 12 V 8 W cordless phone using a 5 V 1 A wall adapter. I am using a step up DC/DC boost converter MT3608 for boosting output from 5 V to 12 V. Theoretically it works - when I ...
0
votes
1answer
81 views

Led on breadboard burned out why?

Please be kind as I am fairly new to electronics. Anyways, from what I read on multiple forums the rules are fairly straight forward, but I am puzzled as to why my led burnt out. So I connected the ...
0
votes
1answer
58 views

9V Battery Current Range

What is the range of currents that I can safely draw out of a 9V battery without damaging it? I am planning to design an experiment and I don't want to draw too much of current out of a battery and ...
1
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1answer
82 views

Are there 5V battery packs available without a boost converter? [closed]

Looking for a 5V portable power source without switching or conversion noise.
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0answers
51 views

Use multiple batteries in series vs Using a boost converter

I have encountered a circuit that totally confuses me: I have a simple LED flash light that came with my electric bicycle. The flash light is designed to work with a range of 24V-36V so it can be ...
0
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2answers
39 views

Can batteries in series be reverse charged if the circuit is open?

Suppose I have four AA batteries hooked up in series and I forgot about them and one of them eventually got completely empty due to self discharge. Also suppose that these batteries are not connected ...
0
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1answer
69 views

Arduino and 3W LED sharing the same power source, is it possible and how?

I've built a remote control for my 3W power LED with an Arduino UNO and I'm powering the Arduino with a USB cable and the LED with 4x AA NiMh batteries (1.2V). Is it possible to power both my Arduino ...
0
votes
6answers
261 views

led I can stick on a AA battery [duplicate]

I have a toy for my son, it's great but it flies round and round in the dark, I was thinking of sticking an LED on it like we used to do at school - back then LED's were rubbish but they had long ...
0
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0answers
112 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
162 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 ...
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0answers
45 views

Unused battery life in electronic device?

Why do batteries in an unused device die out in time? Is it because, even if the circuit is open, - terminal is in touch/connected with a metal inside the device? Or, is it due to chemicals, since ...
0
votes
1answer
54 views

9V instead of 3.7V 8.14WH

I have a solar charger which has a battery of 3.7V 8.14WH which is rechargeable. The battery was rechargeable but died. The charger wasn't working with the battery inside it, so I removed the battery ...
0
votes
1answer
64 views

What resistor do I need?

I have an LED that is rated for 34V at 3A and about 100 watts. I am trying to figure out what power resistor I need with a 36V battery supply. I think I need a 10W 1 Ohm resistor but I am not sure. ...
13
votes
9answers
4k views

Does battery voltage actually get lower when connected to a load, or does it just appear to do so?

Sorry if Im wording this question strangely. I am using a 3.7V battery and my microcontroller monitors the voltage and goes to sleep if my battery voltage is too low. The issue is that it reads a ...
0
votes
1answer
129 views

Mixing Lead acid and Lithium ion in series, after charging them separately

Can I connect a Lithium ion battery battery pack with a Lead acid battery bank; in series. I will charge both separately cells strings separately (not to mix the chemistries) before putting them in ...
1
vote
2answers
160 views

Detecting Open Circuit, Short Circuit and Battery Reversal

I am facing various design challenges with a project that I am currently working on. I've been trying to figure out a way to build a circuit that detects open circuit, short circuit, and battery ...
1
vote
0answers
16 views

floating solar battery charger

Hello!. I am mounting a solar charge controller. with floating voltage !. the schematic illustrated is as follows. A voltage of 27.6V is introduced, which passes through 3 diodes of 10 Amperes. along ...
2
votes
1answer
60 views

Best way to connect 7 x 18650 Panasonic batteries to 2 LEDs

Looking for some help with correct wiring: I have created a custom 7-cell battery (4 cell block in parallel, 3 cell block in parallel and both blocks connected via series) to produce a 7.4V 23.8A ...
0
votes
1answer
45 views

12 V 3.8 A water pump to 12 V 625CCA battery

Wanting to use car battery to power pump. Pump says it's 12 V 3.8 A, uses a 8 A fuse. Trying to sort out possible solar input needed to run pump but the numbers don't make sense. What size solar panel ...
1
vote
1answer
71 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 ...
1
vote
0answers
75 views

Replacing 18650 Cells in a laptop Battery

Is it possible to reconstruct a battery of a laptop with better quality 18650 Cells than that are used by the OEM Manufacturers. eg i have a MSI ge62 6qf with rubbed off LG cells so i cant tell what ...
2
votes
0answers
18 views

Context of Li-Ion MnO2 “Cell Configuration” Specification

My application supports variable pack configurations: 4S4P, 4S6P and 4S8P. Each one obviously uses a different BMS profile, and other minor changes such as charge/discharge MOSFET and fuse selections....
0
votes
1answer
98 views

Battery Balancing system [closed]

I am trying to build a Battery balancer system for 16S8P battery pack.It consist of li-on cells(NCR18650PF). I understood how serial balancing is working properly.If serial cells are not equal,an MCU ...
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3answers
65 views

Reverse Diode and Resistor in parallel for battery connection. What do they do?

Can you please help me understand what the diode and resistor connected to the battery input line of this circuit are doing? Thank you!
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1answer
65 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 ...
0
votes
1answer
42 views

Start ESP (Wemos D1) for short amount of time by pressing a button (no deep sleep)

How can I let an Wemos D1 boot on a button click, letting it execute an action and then shut down. I would like it to be wireless so it can be very flexible, and would love to not have to worry about ...
0
votes
1answer
65 views

How does distance between parallel batteries affect voltage drop/required wire thickness?

I'm looking to wire up an off-grid system. What I'm stuck on is battery placement. The likelihood is my batteries will need to be quite far apart (almost 2 metres). My question is how does this ...
-3
votes
1answer
63 views

How can I connect these two wires? [closed]

I wanted to tinker with the microcontroller of the headphones so I cut the solder between these two wires, to stop the power supply. Now when I connect the black wire (power ground) lead to the ...
1
vote
0answers
36 views

How to consider lifecycle in PV power smoothing?

I am planning to size Battery for Solar PV system by smoothing the PV output. Capacity size can be obtained by looking at Max charge/discharge needed to smooth the fluctuation. This should make able ...
1
vote
1answer
57 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 ...
-1
votes
1answer
28 views

Series voltage and voltage tester module

I have a question about battery tester module. I have in my hands a board that shows the capacity of a 3.7V 18650 LiPo, presumably by measuring voltage. It has 4 LEDs on it. If I hook this up to ...
0
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2answers
35 views

TC symbol on battery schematic

This is a schematic diagram of the connector on a BA-5590 battery. What is the "TCn" symbol? Battery Datasheet
0
votes
1answer
56 views

Can a reverse battery be considered a resistance?

In a simple circuit with 2 batteries and a simple load, one of them supplies 10V and the other 3V. The 3V one is reverse, in a way that the total output of batteries is 7V. Can this 3V battery be ...
1
vote
1answer
77 views

Current flowing through copper wire?

I am a grade 12 student, working with electromagnets for a physics project. My equation requires me to measure the current of a 20-25 cm bare copper wire 18 gauge. The power supply would be an aaa ...
1
vote
2answers
182 views

Why is the energy density of 26650 Li-ion cells lower than that of 18650 cells?

I have an application where I need a rechargeable battery in a very tight space too small for two 18650’s but large enough for a single 26650 cell. I have done some research on these cells and ...
2
votes
2answers
175 views

Replaced 4x AA battery with 6V 3A DC adapter, but device won't work

I'm hoping you smart folks can help me. I'm puzzled by what I thought would be a simple DC battery to DC adapter swap. The device I'm trying to mod is a a microchip activated pet door (SureFlap ...
0
votes
1answer
94 views

How to solder this broken Gameboy Color part back on?

I'm trying to repair a GameboyColor where a part that held a battery broke off. I tried soldering it back on but it didn't stick. (I'm new to soldering) I took some pictures, any feedback and advice ...