Questions tagged [batteries]

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

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16 views

How to figure out the power requirements and battery capacity/requirements for a dual fuel source system

I'm very new to this sort of stuff so please forgive any ignorance. I am hoping to understand how I would go about figuring out how much power our devices consume, how many batteries and what type of ...
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2answers
62 views

Lead acid battery for embedded system

I am developing an embedded system that contains a 12 V lead-acid battery. The system is developed for 12 V vehicle applications, also using a 12 V lead-acid battery. I am not so sure how to connect ...
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52 views

Is there a way to recreate or buy this battery? ICR14500 3.7v

I'm trying to repair a soap dispenser: https://www.simplehuman.com/products/foam-sensor-pump I opened it up and found the battery was damaged, and I wanted to see if I could replace it. Before I ...
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30 views

Cell matching by capacity and resistance

When matching li-ion cells in a battery pack how do you use both the cell's resistance AND capacity? I've seen sources mentioning that each parallel group should have about the same capacity, and that ...
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40 views

Remote LED to warn me when a relay in my hot water supply is activated; all wirelessly

I have installed two electric water heaters in series; the new one is only being used as a preheater that only comes on automatically when my solar panels are producing more than my consumption. All ...
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30 views

What is the ASBBA-001 battery connector (GoPro Fusion 360 camera)?

I am designing a PCB that will be powered by a battery. The battery model is the one used by the GoPro Fusion 360 camera. Specifically, it is the ASBBA-001 battery. I need to know which is the model ...
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1answer
45 views

“Hidden” terminals on DC motor

I have this DC motor that I tried testing with common sense, but doesn't work. The description classified it as "Female terminals" I don't have a multimeter on me now so I can't be sure ...
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1answer
25 views

Is it suitable to wire 'protected' li-ion cells in series and parallel? 2S6P

Here is the circuit designed to give about 7V. Each cell would be a protected cell. Is it safe to connect these cells that way? Thanks
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1answer
27 views

How to stabilize and add additional power to an existent line?

My first question on this Exchange so I hope this is the right place for it. Currently, I have a quite unstable power supply in my workshop, coming from a very old electrical installation. It is a ...
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47 views

Two phone batteries connected in series not working

I have two, fully charged, 3.7V standard Nokia phone batteries, that I want to connect together to use as a 7.4V battery, I connected the (+) of one to the (-) of the other, and then tested it but it ...
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can I modify lithium ion battery

I want to make a chemistry school project with lithium-ion battery for that I'm thinking that if I could open and modify a lithium-ion battery and reuse it again as my project my questions are. Can I ...
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1answer
39 views

How can I build a power bank which charges to 16.8V and outputs 12V?

I am working on a battery build project to drive a small 12V electric motor (7A max current draw), and so far I have gotten this far: I will use Li-ion 18650 cells in a 4S6P configuration I will wire ...
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32 views

12V Mobile Power Setup -

I am looking for feedback and experienced insight as I'm new to this world. I have a 12V 18Ah AGM battery connected to a 300W 110V pure sine wave inverter with the intention of running a 140W speaker ...
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1answer
70 views

How long should one let the motor turn (witout driving) to re-charge the car battery, after having using it to charge a laptop's battery

I'm going to spend 1 week with no electricity. I won't need any for everyday life (I do this each year), except to charge my laptop's battery (10.8V, 5.2Ah, 57 Wh) three or four times. I have a car ...
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1answer
46 views

On new phones, how are two batteries at half capacity able to charge faster than one at full capacity?

Lately, there seems to be a trend in cell phones where they have 2 separate batteries, and this is claimed to increase changing speed. See "Oppo suggests that because the two batteries can be ...
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4answers
130 views

Powering a 1 watt LED using a 3 V coin cell

I was hoping to power a 1 watt LED (would be great if this is capable of powering 2 or 3 watt LEDs) with a 3 volt coin cell. Will the coin cell be able to output voltages and amperages that are ...
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43 views

Shorted 18650 Li-Ion Batteries

I accidentally shorted three 18650, 3700 mAh batteries connected in series for about 2 seconds. I measured each cell individually with a voltmeter and they read very close to its original rated ...
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3answers
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Why are so many batteries 3.7V?

This seems like a very common voltage. I remember older batteries used more round numbers like 1.5V or 3V or 9V. 3.7V seems very arbitrary but seems to be everywhere.
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59 views

To (almost) fully discharge a rechargeable NiCd battery [closed]

How to fully discharge a rechargeable NiCd battery the easiest way till at most 0.7 V? I.e. by whatever means/method on our daily/natural hack not requiring any expense/device made to specially ...
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2answers
130 views

How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh?

I am working on a 100 kWh capacity gravity battery bank. How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh? How many kWh would it take to lift the ...
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31 views

Solar Battery For Greenhouse [closed]

I want to power water pump and ventilation fan in my small greenhouse using a 12V battery. Greenhouse in on my balcony where there is no electric socket. Thus, I want to use solar panels to charge the ...
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1answer
30 views

Could I get a second pair of eyes to check if this BMS can be used for charging?

I'm new to electric engineering and electronics in general, so as a first project I'm building a battery using 18650 cells (4S4P). I am aware of the risks when buying from Chinese suppliers on ...
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1answer
88 views

USB and Battery switching circuit not working [and buck boost converter not working either]

I am an absolute beginner when it comes to electronics and this is my first circuit, so please excuse my ignorance and thank you for your patience and help. I am trying to build a circuit which ...
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1answer
57 views

Capacitor for reducing voltage drops

I use gsm module, which makes current bursts up to 2Amps (maybe slightly more). That causes voltage drops about 0.5V on my power supply (I use lipo battery), and than device hangs up or starts ...
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1answer
92 views

Li-ion vs Li-Po batteries cut-off protection

I am confused with the differences between Li-ion batteries (like 18650) and Li-Po (the flat ones). I know that basically they are both lithium ion, but when I want to buy I see that LiPos have always ...
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1answer
25 views

Connecting six protected 18650 cells 3S2p for close to 12V, suggestions?

I want to make a 12V range battery array with 2P 3S 18650 cells. The cells will be charged in an external charger NOT in the pack. They are removable in holders So I can pluck them out and charge ...
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2answers
51 views

What kind of gps battery can I use for uBlox NEO-M8N GPS module?

What kind of gps battery can I use for uBlox NEO-M8N GPS module? Would you please recommend gps battery? and Which can I use 5.5mAh or 11mAh?For example; MS621FE-FL11E - BATTERY LITTIUM 3V 5.5MAH (...
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4answers
61 views

Recycling a flashlight

I am "another one of those" :) with some understanding but lacking knowledge. I can identify components, know what they are for and even change them when they are visually burn or broken. So ...
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42 views

Battery Charging and Discharging rate

I did some calculations for hybrid renewable energy system and I calculated the energy from PV and Wind. Then I modeled a battery for both the PV and the Wind energy systems. I found that energy ...
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47 views

What's the name of this battery connector?

Been trying to find this "battery bridge" as a spare part to old virtual pets. It's like cell battery connector, but it's individual part connecting two cell batteries (LR44), which has ...
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2answers
58 views

Connecting two similar, equal voltage batteries in parallel

I am trying to increase the range of my son's child electrical vehicle. It came with a 12V 10Ah battery. I bought a second one, which is 12V but 12Ah. It may have other differences too, but it looks ...
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2answers
38 views

SCR crowbar circuit gate voltage?

I'm designing a simple overvoltage / reverse voltage protection circuit for a 24V battery system, with plans to upgrade to a 48V lithium setup in the future. I selected the parts to trigger on a ...
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1answer
35 views

Battery charging with boost converter topology

I'm designing a circuit for battery charging, which will make use of boost converter topology. I have determined the input/output voltage and current parameters for the circuit. If I put a resistor at ...
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0answers
38 views

DIY battery pack with 18650s

Little backstory: I built an electric skateboard about 4 or so years ago and like 6 months back I was riding it at my normal 35 mph and a solder joint came loose on a battery and opened the circuit. ...
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1answer
41 views

are all 18650 batteries interchangeable with one another?

I recently bought a PowerTac E9R-G4 flashlight that uses 18650 batteries. Replacements can be bought on amazon.com fairly cheaply. The box the flashlight comes in and the manual, however, both say &...
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1answer
100 views

Why are alkalines “required” for metal detectors?

A handheld metal detector specifies only "Alkaline" batteries and not "heavy duty" or "rechargeable". Since there are li-ion 9v batteries available not at low cost I was ...
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2answers
90 views

Will this work? Transistor to keep the uC power supply on once a trigger happens

I am trying to have a switch (momentary) on a remote, that will send power to the LDO. But as the switch is momentary, the power will be disconnected. Can I have a transistor or some Mosfet to keep ...
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2answers
21 views

Are the maximum battery voltage and the open circuit voltage (equivalent circuit ) of the battery the same?

If you model the battery equivalent circuit with Rint circuit, Are the maximum battery voltage and the open circuit voltage of the battery the same? And can we interpret the range in which the ...
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2answers
60 views

Could this simple circuit charge li-ions in parallel?

My goal is to design a circuit that can reliably charge 3.7V li-ion batteries in parallel for extreme high current applications (think over 100 amps). Normally, I would just buy a cheap li-ion ...
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1answer
48 views

What type of battery is used in Oura ring? [closed]

What type of battery is used in Oura ring, and how many mAh is available? I am not sure how does Oura ring manage to claim up to 7 days of battery life. Should not using an LED and BLE connection in ...
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1answer
38 views

Effects of power fluctuations on batteries?

When we use an AC motor for the battery, if the motor load fluctuates and the power fluctuation occurs, what will this affect on the battery? As a simple example, if the power changes by 10 + 2 sin (t)...
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44 views

4s, 18650 battery pack, how to select used cells?

I'd like to build a reliable 14.4v 4s 18650 battery pack from used laptop cells. I have built two 4s 18650 packs previously, but both failed. I wired them up with the power and balance charge wires, ...
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58 views

Battery Packs not showing any voltage on multimeter

I made 4 battery packs with 10 batteries in series each using a spot welder. Each of the batteries in each pack are 1.37V, but when they are connected, the voltage is shown at zero. I took the ...
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1answer
38 views

Frequency of the standard battery discharge curve

What can we say about the frequency of the discharging battery? You know that batteries, for example Li-Po, have a characteristic charge and discharge voltage curve. And under a certain rate of ...
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2answers
63 views

If the anode attracts negative ions and the cathode postive ions. Then why do electrons flow from anode to cathode?

I know that in a battery: The anode is where oxidation takes place (the anode losses electrons). The cathode is where reduction takes place (the cathode gains electrons). But I am confused why is the ...
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1answer
65 views

How do safely discharge Li-Ion batteries to check full capacity

I regularly have to test old phone batteries in my mobile phone refurbishment business. I need a safe solution to discharge 3.6V batteries. When I buy batteries they come from old stock so I need to ...
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1answer
485 views

What are the 9V battery terminal size specifications?

I'm trying to find the dimensions of a 9V (PP3?) battery (no specific chemistry). For some reason it's giving me a lot of trouble. I've been able to find most of the information (I checked a bunch of ...
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1answer
20 views

Need help with maximum safe load on a C10 battery in a Solar power system

I have a solar system with 20Amps/12v MPPT, 150ah/12v C10 battery, 500watts/24v panel and 1000va inverter. I have a few questions. Can I use a 750w cloth iron on this for 30 minutes? As per my ...
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0answers
25 views

Does Sony NP-F type (generic) batteries have any over discharge protection circuitry inside?

I use these Sony NP-F550 or NP-F570 Li-PO generic batteries (8.4V) for video light and for powering my DIY projects. I've read you shouldn't discharge a 8.4V Li-ion (it's a double 3.7V cell inside the ...
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1answer
59 views

Using 5V, 2 A charger to charge a 7.4 V, 5000 mAh Battery

I am designing a product that has a 7.4 V, 5000 mAh battery (Two li-ion cells connected in series). Is it advisable to charge it with a 5V, 2 A charger? If no then what are the issues which we may ...

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