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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Is it possible to use a portable power bank to run a 40W amplifier? [closed]

I have a small 40W speaker that I use for home. I would like to use it outside, and I was wondering if a portable power bank could run it for at least a couple of hours. If that's the case, how big ...
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1 vote
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Should I use a DC-DC converter or an LDO?

In my project, I am designing a board which is supplied by a battery. The battery is a LiPo, 3.7 V, 1000 mAh, so its voltage range is 3 - 4.2 V. All the components on the board need a fixed voltage of ...
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Can you use a 12V lead acid battery to switch a contactor?

So I'm making a manual precharge circuit for a solar car's motor controllers, and need to use a 12 V source to switch a contactor on/off thus switching between a resistive path and a short circuit ...
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Substantial voltage drop when connecting battery to DC load

I wanted to test the battery from an e-bike. I have noticed quite strange behavior. The first thing I did was to measure the voltage. It was 66.1V which is fine for a 60V battery. When I connect the ...
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How to supply power to a DC motor which will be used for an electric skateboard?

I bought a 775 DC motor 15000RPM 12-36V. I'm planing to build an electric skateboard with it. But I don't know how to supply enough power to this motor in order for it to carry me with a decent speed. ...
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Can SOT-223 chips or any DC type of transistors receive 12 V from a 19 Ah lead-acid car battery?

Can SOT-223 chips or any type of DC transistors receive 12 V from a 19 Ah lead-acid car battery? Will the 19 Ah current kill the DC transistors? For example, using an AMS1117 to produce 3.3 V. The ...
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Charge a 12V 90Ah led acid battery using 12V 20A SMPS

Let's assume I have a 12V 90Ah battery and 12V(15v max) 20A SMPS. I want to use this SMPS to charge the battery. I heard that 1/10 of the battery current is good to charge the battery. So that means ...
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What are the possible reason for swelling a coin battery?

A CR2032 lithium battery is powering a Bluetooth LE based smart device. During the long-hours- continuous-testing, the battery in some test pieces got swollen. The heat is controlled max 80°C. Battery ...
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Polarized DC breaker between the battery and the inverter [closed]

I'm setting up a 5kW off grid solar system and planning to install a 125A polarized Dc breaker in between the 5kWh lifepo4 battery and the MPPT inverter. I heard that a polarized breaker isn't ...
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Off-grid computing

I am designing the electrical system for a school bus to tiny home conversion (skoolie, by jargon.) The current iteration is entirely solar powered, somewhere around 2640 W in panels, and likely 1000 ...
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What concerns should I have when using per-cell charging in a LiFePO4 design?

I've started looking at using 26650 LiFePO4 cells in various (personal use) systems. I've been learning a lot on the topic lately, including how cell balancing systems actually work. While passively ...
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Charging two 18650 batteries separately but using them in parallel in one circuit

I want to build an external charger for 18650 batteries. I want to use the TP4056 module in order to do that. I just want to charge one single battery with that. So this charger will have a single ...
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Tips to replace and soldering the battery connector in pcb

Tips to replace the asus rog gl703 8 pin battery connector, I think using a soldering station that shields nearby circuits with kapton tape and tin paste is a good idea to start with, the board still ...
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Solar charge controller

I have a question related to pwm charge controller .If I have 120W,22V PV pannel and i have to charge a 12.8V ,54Ah battery,which solar controller to use, pwm or MPPT?
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Circuit to charge three lead acid batteries in parallel and discharge them in series

I have three 12V lead acid batteries. I want to charge them in parallel and discharge them in series. I designed a circuit using switches and SPDT switches. The simulation works, but I was hoping a ...
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LiFePo4 Battery management system

I am creating a 2Ah 3 cell LiFePo4 battery using individual lifepo4 batteries, for a project that requires solar charging from a genasun mppt controller. Considering the battery is split into 3 cells, ...
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How to simply balance two parallel connected cordless drill 18v batteries?

I am fairly new to battery management systems. I am planing to use two cordless drill 18v battery (5A each) in parallel for an IoT project. For the time being, I've just coupled the batteries through ...
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Is using a non-balance protected lithium-ion battery ok?

I am building a project where I use 4 stepper motors. Since they require a lot of power I am considering using a Lithium-Ion battery for them. This is what I was looking at: https://www.onlybatteries....
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Connecting LiFePo4 in series?

I am looking for 3 LifePo4 batteries for a project, since they are quite stable when compared to Li-po/Li-ion. I have found this battery that fulfils the max amp draw requirements. I need three in ...
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How to connect vibrator motor to batteries? [closed]

How am I supposed to connect batteries with this device? There is a piece that fell off from it when I opened it, where is that piece supposed to go?
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Charging only the first battery in a series

I have a series of three 3.7v 600mAh LiIon batteries powering a ca. 12v circuit. Currently, a DPDT switch rewires them into a parallel configuration when I charge them–each battery with its own ...
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Charging Parrot AR Drone 2.0 battery (11.1 V (3s) Lithium Ion) without disconnecting [closed]

I have a project where I would want a drone to be unattended but still be available to use at all time, the idea is that when the drone has finished being used, it will land on some conductive pads ...
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1 vote
1 answer
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CR1220 holder 2D footprint error from manufacturer?

I just ordered a PCB that uses a certain battery holder. I am looking at the 2D footprint and 3d model now thinking there must be some error, but I wanted to confirm this before I recall the PCB, also ...
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Two power sources and two outputs with one switch

Hi I'm new to electronics and have little idea how electricity works. I have a motorcycle and wanted to add two LED lights. I want to have one switch in both LED but with different sources. The first ...
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Fully charged battery voltage of devices

What is the voltage value of fully charged (and what is the value of fully discharged, out of curiosity) battery (1s li-ion) in common devices such as smartphone? Of course li ion provide ability to ...
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How many watts total from 1876 Clarendon Dry Pile Battery / Oxford Electric Bell?

How many watts has the Clarendon dry pile output since its creation in 1876? I've tried looking however cannot find any details on this.
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Charging board cuts out when unplugging USB cable

I’m using a Lithium battery charge/discharge board with 5V regulator and USB-C input to power a gaming handheld. It’s important that I be able to run the handheld and charge the battery at the same ...
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2 answers
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What type of power supply is best for short circuit experiments? [closed]

I do a lot of experiments with resistive elements/heating elements, electroplating research work and similarly many other experiments. I'm currently using batteries, batteries work well for some time, ...
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How to measure the voltage of battery while charging?

I want to design a battery charger. I need know the voltage of battery to calculate the state of charge (SOC) of it, but if I just put a voltage measure model in parallel, it will measure the charger ...
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Efficiency of extraction of aluminum from aluminum hydroxide

This is regarding aluminum air batteries Since they are rechargeable, in order to "recharge" the batteries we need reswap the aluminium cathode with aluminum hydroxide which is formed. That ...
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Battery capacity and parallel vs. series battery connections

Say you have 4 200 Ah 12 V batteries connected in parallel, this as I’ve come to learn increases the amp-hour value and not the voltage, and say you have another system same as that but connected is ...
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Servo problem (batteries?)

I've bought some of these servos. I'm trying to control them with an Arduino Uno. Currently I'm only trying to control one. It's connected to 4 AA alkaline batteries (Duracell plus), with a common ...
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How to test if current reading functionality on multimeter is working

I have a new multimeter that I've tested the voltage of a 12v flooded lead acid battery with before. Today I tried to test the amps running on the battery, to see if there was parasitic draw. As ...
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Key terms, multiple-output battery voltage regulator

I'm working on a space limited project, using an LI2430 rechargeable Li-Ion coin cell battery. I need to power a 2V7 LED rail, and a ...
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What conditions are required for a Lithium Polymer battery to ignite?

If a Lithium Polymer battery cell sustains a small amount of damage that only effects the pouch (eg a small puncture or tear in an area where no contact is made to the electrolyte / anode / cathode ...
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RISC-V GD32VF103 battery backup domain

I'm not sure how the VBAT pin of the GD32VF103 RISC-V MCU should be connected, exactly. The GD32VF103 User Manual states: The Backup domain is powered by the VDD or the battery power source (VBAT) ...
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3 votes
1 answer
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What are these battery power connectors called?

I'm trying to source some battery contact connectors for sliding straight metal strips into. They're the sort of thing that are used in power tool batteries, but I want to use them for a different ...
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When I connect a battery, the system fails

I have a standalone PV system with boost converter using perturb and observe (P&O) as the MPP algorithm. The values of input, output capacitors, inductor are calculated correctly based upon a ...
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6 votes
6 answers
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Boost voltage without switching

What I am doing: I am making a wearable device which will use Li-po battery/ies to operate. I am measuring small currents (meaning I want to avoid buck/boost converters). My design draws a current of ~...
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1 vote
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How do Fuel gauge ICs compensate for battery aging?

I came across this Fuel gauge IC recently and although I understand how the SOC is determined, I do not understand how the age compensation constant(the one used to determine the actual SOC) is ...
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1 answer
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Correct connection to F3 type battery terminals

Looking for deep-cycle lead acid batteries, I come across several models which feature what they call an "F3" type terminal, like this: Basically a vertical metal tab with a hole in it. I ...
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2 answers
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Li-ion End of life

What will be the reason for reduced capacity of Li-ion cell at End of life? What will be the nature of voltage at EOL with respect to BOL? Will it be still reaching something like 3.65 or 3.7?
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1 answer
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Non-rechargeable 9V battery with diode between 12V car battery

I have a microcontroller which is powered by a car battery, voltage is stepped down to 3.3V using a voltage regulator. However if someone cuts the cord to the car battery the microcontroller has a ...
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4 votes
4 answers
640 views

Why is this LM317 giving an unexpected output?

Just for fun, I used an LM317 IC with two resistors (1.5k and 470 ohm) to get an output voltage of around 1.8 volts and used this circuit with a wall clock. It worked amazingly well when I connected ...
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Difficulty in deciding battery requirements. I am using 64 A3144 Hall sensors connected to eight 74HC165 shift registers & 64 WS2812B LED strip

The image is just a basic representation. I am making a college chess project. I was powering all this with my laptop using an Arduino Uno. I plan to introduce a 16*2 LED display and one ISD1820 with ...
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3 votes
7 answers
207 views

Why is the ground pin always connected to the "negative" power supply?

Please try to explain this in a way that I will understand. This is extremely frustrating for me. And try to explain where my confusion lies. I'll try to explain my frustration. Every piece of ...
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2 answers
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Can I use one power supply for different ampere motors? Will it affect the motors?

I have two motors, one motor uses 12 V 5 amps and another motor needs 12 V 7 amps, I have a power supply (SMPS) of 12 V 30 amp capacity. I'm planning to connect both motors to the same power supply. ...
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-1 votes
1 answer
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Made a mistake when Jumpstarting the Car

I made a mistake in connecting the cables for jump start. Instead of attaching one of the negative cables to the negative pole of the donor battery and attaching the other negative cable to a metal ...
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1 answer
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How do I calculate the maximum amount of current a battery can supply?

I have a few of these rechargeable batteries: http://w3.cebeo.eu/pdf_nl/4045126.pdf I'm wondering what the maximum current this can supply is as I'm looking to connect 4 of these to power 3 servos ...
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1 answer
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How do I calculate required voltage and current for multiple servos?

I'm looking to power 3 servos and control them with an Arduino Uno. Could someone please explain to me, not just specifically for this, how I can work out how much voltage and current I need to power ...
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