Questions tagged [battery-operated]

Involving or pertaining to a circuit or device that is intended to be operated with cells or batteries (as opposed to mains power, for example).

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55 views

Establishing Safe Operation Range for Lipo Battery with Buck Boost Converter

I have a circuitry that I need to power up with lipo battery. I need to regulate battery to 3.3V with buck-boost converter, since LDO can not be able to provide required current output and causes ...
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3answers
56 views

Failure of a C cell in a 4x battery pack, potential causes?

I am trying to understand failure of cells in battery packs of 4 x alkaline C cells (in series, so ~6V output). The failed cells, from 2 separate battery packs, have bulged and leaked out, you can see ...
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1answer
29 views

Inductors and caps on buck-boost converter getting very hot under medium-ish load

I'm currently using a buck-boost converter (generic XL6009 buck-boost like this one) to power a router and fiber terminal from a 12V battery backup system. The reason for using the buck-boost ...
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1answer
48 views

Lithium ion battery safety in car?

i want to use a lithium-ion battery as backup for my circuit in vehicle. i scare about explosion and safety . i decided to use TP4056 ic but many batteries has not temperature pin . - can i use ...
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1answer
49 views

Needing a simple circuit to switch a vacuum pump from a pressure switch at 4.5v

I’m looking for some help to build a simple circuit to take a NO switch input and use this to drive a 3-5v vacuum pump. The switch I’m using is open when the pressure has not been reached (Which is ...
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38 views

reverse polarity and low voltage protection circuit proposal

I'm designing my own li-ion single cell protection circuit, whose requirements are the following: Shall be protected against reverse polarity Shall disconnect power whenever the voltage battery is ...
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25 views

DIY solar setup related questions on following topics: VSR, storing batteries correctly, wiring diagramm, misc

Please keep in mind I am not an electrician, however I have spent a lot of time researching the basics to obtain a fundamental understanding of the topic. Also, this project is an enhancement to an ...
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2answers
56 views

Can I put my battery in the middle of my parallel circuit?

This is a small project, basically cosplay, four 5mm LEDs wired in parallel. Normally, I put the battery at the end: But could I put the battery in the middle with the same result? I'm researching ...
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1answer
67 views

Automatic series/parallel configuration

I've been thinking about this issue for a while now and came here for your guided assistance. Situation: Ik have 4 resistors (12V/1.25W heater pads). I need to power them with either a 12 or 24V ...
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0answers
37 views

How to Modify LED panel’s power board to turn it on/off using Arduino pro mini

I’m a software developer and beginner in electronics. My objective: I want to modify, https://www.amazon.com/Ulanzi-Ultra-Bright-Video-Light/dp/B0757KCWGW LED panel product in a way so that the on/...
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41 views

I want to build a battery based DC supply for LED mirror that has AC power cable (230VAC)

I recently purchased an LED mirror that is AC powered (230VAC). The problem is there is no GPO (power outlet) in the room. I am trying to make this wireless and wall mounted. I tried researching DC ...
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55 views

Mini PC stick can be powered with mains power adapter (5 V/2 A) but not with power bank (also 5 V/2 A)?

I bought this product with the hopes of powering it with a power bank: https://www.intel.ca/content/www/ca/en/products/boards-kits/compute-stick/stk1a32sc.html https://www.amazon.ca/gp/product/...
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1answer
26 views

How can I determine what kind of power supply or battery I need for my four NEMA 23 stepper motors?

I am trying to determine what current my power supply needs to have for my mini rover project. The NEMA 23 motor specs are as follows: Bipolar amp/phase is 2.8A and the bipolar resistance/phase is 1....
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17 views

Battery powered device - How to measure external floating differential voltage

I have the following task. As depicted in the sketch, I have a battery powered device which needs to measure the differential voltage VIN between two external nodes, EXT_NODE1 and EXT_NODE2. It is not ...
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4answers
69 views

What is this white box in a battery pack?

I have an O2 Hurricane canless air system that seems not to charge anymore. I was a bit surprised because it hasn't been through much use or many charging cycles, and customer support was non-...
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75 views

Powering a RF circuit with CR2032 along a capacitor, pulse currents of 150mA

I am designing a battery powered circuit which performs RF communication. The goal is to use a 3V CR2032 battery. The RF circuit consumes 0.2mA as average current and lowest voltage it can work on is ...
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1answer
65 views

12v wiring regulations (UK)?

What regulations (if any) do I need to follow if wiring a 12 volt system (in the UK). I was planning to wire up a garden shed / summer house to the 220v mains. I'm confident I could wire it safely ...
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33 views

Powering and dimming white LED from single-cell 3.7 rechargeable lithium battery (with a 3.3V Arduino mini)

I'm designing a circuit for a handheld project that runs from a 1-cell rechargeable Lithium battery (18650 or prismatic). The circuit powers an Arduino Mini Pro running at 3.3VDC. The Arduino board ...
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1answer
62 views

Efficiently reducing input voltage

I have a battery powered system that currently supports up to 5.5V input voltage (which amounts to 2-3 AA batteries in series.) I'd like it to support up to 4 batteries in series (so up to 7.2V ...
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22 views

Additional battery in parallel (Li-ion)

So, im trying to figure out how to wire in an external battery for my computer electric scooter for more range. I messaged the manufacturer but only got a concluding message of the factory workers ...
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1answer
42 views

How to use LBO on Powerboost 1000C as input for Arduino

I am using a project which uses an Arduino Uno and a powerboost 1000C. in the manual it says, LBO - not a leveraged buy out! this is the Low Battery Output. By default it is pulled high to BAT but ...
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2answers
58 views

small inexpensive battery powerable component for daily timer circuit with LED and button

I want to make a small "visual alarm" device that turns on a LED every day at a time (e.g. 17:00) and turns the LED off on button press or (if no button was pressed) at a later time (e.g. 22:00). I ...
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2answers
29 views

Extracting 25W from a pair of 18650 li-ion in series

If I have 2 bats of li-ion in series. 8.4V full charged and 6V full discharged. What should be their minimum mAh capacity, if they are 18650 size, and considering a constant load of 25W. 25W/6V = 4....
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1answer
44 views

Calculating Battery Life with different working voltages

I have device that draws 30 uA in current continuously, and it is powered by a Panasonic CR2032 device (240 mAh - continuous standard load current: 0.2 mA ). There are two components on this device, ...
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1answer
40 views

Replace UR battery by IMR with lower mAh [closed]

I am replacing a shaver’s battery, a Braun Silk Epil 5. It uses a Li-Ion battery manufactured by Sanyo for Braun. According to my research it must be a UR Battery like the UR18500L : ...
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30 views

Check my battery powered layout

Few days ago I had topic about issue with power inductor crashing circuit. I almost resolved issue without making new by 90%. However sometimes circuit crashes -> I did some updates based on replies. ...
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2answers
89 views

Limiting input voltage for buck converter

I want to power some micro controllers and a couple of leds on my electric bike, counting up towards 5 Amps. Power supply is a 36V battery, with a range of about 42V to 33V. This voltage is to be ...
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1answer
51 views

Motion triggered battery powered dimmable COB LED light

My view on life, in any field, is not to produce more but to consume less. Everybody told me this is a very eccentric weird mentality. Perhaps they are right. Nevertheless I have to build my project ...
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1answer
28 views

Times a DC motor can be driven from pair of AAA 1000mAh

If I have 3V voltage made from two AAA in series, both 1000mAh and driving a 3V 1.5W DC motor with it, being the duration of tON exactly 1 second for each drive attempt. Is it possible to estimate the ...
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1answer
65 views

Battery powered step-up converter not gives enough amps

I am creating two part PCB running on Li-ion battery 26650 (3C discharge rating, max capacity 5000mAh) powering few LED strips with controller. PCB 1 (schema 1) has step-up converter MT3608 which ...
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1answer
74 views

12V lead acid battery instead of 11.1V LiPo?

I'm doing research on a remote control model ship. I have 11.1V LiPo batteries, but because of their weight and duration, larger batteries are considered better in this application (these batteries ...
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1answer
62 views

Power supply or-ing with ideal diodes - priorities?

My PCB can be supplied by internal LiPo, USB or via an external supply through a data connector that also carries power. Right now, I have the power inputs or-ed with LM66100's. I'd like to ...
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1answer
39 views

How can I determine LI-ion battery charge while varying the load?

I'm building an autonomous boat which contains a li-ion battery pack and I want to know how much charge it still left in it. To do this I measure the voltage of the battery pack. I let it run for ...
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1answer
22 views

voltage fluctuation observed in two parallel Li-socl2 battery

Application: our device working is like it wake up 5 times a day wake up period is nearly 30 sec and during this time take measurement from sensor and send data on zigbee and go to sleep.active mode ...
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1answer
90 views

How to combine LTC2954 with TP4056 charging circuit

I'm new with electronics and I'm working in a personal project with ATmega328P-AU. The project basics are and ATmega328P-AU powered by a LiPo battery and the battery is charged and controlled by a ...
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3answers
61 views

To ground or not to ground: portable power supply

So I'm creating a backpack system to carry around and shine a 100 watt HID lamp (using the arc tube for UVC mineral collecting.) This system currently includes a 12v lithium battery, a power inverter ...
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1answer
224 views

When connecting two battery grounds together, which battery specifications can tell us the limits?

This question came to me while connecting a lower voltage battery to a higher voltage battery by connecting their grounds using an NPN transistor switch. I know it works, but I don't know how to ...
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3answers
291 views

Emergency Backup Battery Supply

I am building a NodeMCU controlled 12v solenoid. I am hoping to add an emergency backup battery supply, but the emergency backup supply should not power anything but the solenoid. In other words, if ...
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2answers
47 views

How to determine what battery to use?

I am making a project that requires two different voltage levels, 5V and 12V (although this can be lowered to 7V minimum). I have two voltage regulators as described by the schematics below: I want ...
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1answer
48 views

In my dc to dc buck converter(0 to 17V - 12v), when i connect a load ,converter output voltage decreases to 1V [closed]

I try a buck converter of variable input(0 to 17) to 12V. when i connect a load with very small resistance , voltage decreases.if load increases , converter voltage looks constant. what happens if i ...
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2answers
60 views
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1answer
53 views

Which among the circuit is the most efficient for battery backed up systems?

Which among the circuit is the most efficient one for a battery backed up solution. Would be helpful if you can state the reasons as well. simulate this circuit – Schematic created using ...
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0answers
58 views

Always plugged in solution with battery backup

I am trying to design an micro-controller based solution which is always plugged in and has a battery backup in case of power failure. I am using an SMPS power supply rated 15V, 1.4A which is always ...
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0answers
24 views

stm32h753 rtc resets after power down (vbat is connected)

I am using a stm32h753 and stm32cubemx, and trying to run the RTC module on VBAT. To do this I have connected a battery to the MCU. RTC is connected to LSE. Next, I set the RTC in my code and then I ...
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1answer
42 views

Battery wear on small solar powered devices like watches or pocket calculator

As I understand, small repeated charges to a battery damages it. How are small electronic devices, like solar powered watches and calculators, designed to deal with this? Is the battery basically ...
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1answer
75 views

Battery backed up power supply using LDO

I was looking for a battery(12V, 11.2Ah lead acid) backed up power supply solution for my ESP microcontroller(3.3V) along with few relays(3V) and came across some reference design in the following LDO ...
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4answers
82 views

How can I calculate the minimum switch time between main battery and back-up battery for my board?

I have UpSquared board for an embedded system. I have a main power supply(battery) to feed it and I also have a back-up battery for some situations. For example, something happened and main battery ...
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1answer
92 views

What is wrong with my USB Li-Ion charging circuit?

I'm trying to design my own PCB based off of this one: My relevant schematics are here: Their Q3 transistor DMG3415U-7 was going obsolete, so I used DMP2045U-7, which seemed to be a similar ...
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1answer
50 views

Building An Electric Cart

I am trying to build some sort of electric cart, to help me push something. The cart would have to push about 120-150 pounds. It wouldn't have to completely push the whole thing, just assist me with ...
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1answer
17 views

Switching Battery to Usb

I am designing an hardware including MCU's, camera , RF components etc. Shematic looks fine and my question is actually about powering part. I have put some battery powered applications based LDO. It ...

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