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).
521
questions
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2answers
34 views
LiPo battery powering low power MCU
I have an "ultra-low-power" MCU STM32L011F4. According to the specs its powering voltage range is from 1.65 V to 3.6 V. I want to power it with a LiPo battery with nominal voltage of 3.7 V. Which is ...
0
votes
0answers
21 views
How will using an differential op amp effect power consumption
Setup
I’ve put together a suite of sensors connected to an ESP32 microcontroller. Every 15 minutes the chip wakes up takes sensor readings and sends out the data using the integrated WiFi. About 10 ...
2
votes
3answers
3k views
Emergency lighting solution
I have purchased these following components:
12V/18Ahr SLA battery
300W modified sine wave inverter
50W LED floodlight (NO SENSORS I.E. PIR, AMBIENT, ETC)
12V relay module
We are currently ...
0
votes
1answer
38 views
Understanding Power/Current/Voltage drawn by LED Strips
I am trying to create a LED lamp which will be powered up by a battery. Lets assume I want it to run the lamp for 1hr. My LED Strips operate at 12V with 19.2W/M. I am using around 1.7 Meters(198 LEDs) ...
0
votes
1answer
17 views
BQ297xy Overcurrent protection
Can someone explaine to me how dose this overcurrent protection works and how to calculate it?
BQ297xy Schematics
2
votes
2answers
680 views
Nichrome wire not heating up with a 9v battery
I have a 42 gauge nichrome wire. When I pass current through it from a 9v battery, it does not heat up. I have checked the circuit properly and also the battery.
Wire resistance: 5.8533 ohms
Wire ...
0
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0answers
44 views
Calculating battery percentage after voltage drops
I would like to display a battery percentage based on the remaining charge in the battery. I do not know if there is a better way of doing it other than measuring the voltage across the batteries.
...
0
votes
1answer
86 views
Can I decrease voltage in a battery to get higher amp hour rating?
I am willing to use my 7.4 volts 1000mAh lithium polymer battery to power a motor that works with 3.7 volts, so I will input the 7.4 volt to a high efficiency buck converter to get an output of 3.7 ...
0
votes
3answers
91 views
What is a “safe” amount of amps to draw from this pack
I've been working on a quadruped project, and need some help determining the... safety... of my power system.
To start, there's two packs, a larger "main" and a smaller "reserve"
the two packs are ...
0
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0answers
17 views
Making a DC coupler for my panasonic camera DMC-TS5
I have thought about making a DC coupler sort of by:
just using the insulated copper wires inside coils,
connect each to the nodes of my camera battery (working battery) - will need soldering,
...
0
votes
2answers
204 views
Can a low amps 48v battery handle big DC motor
I have a 48V DC motor, 3500W at 300A, combined with a dc controller with 60A constant and 120A peak discharge rate.
Can a 48v li-ion battery with 20A constant and 40A peak discharge rate, safely ...
0
votes
1answer
56 views
High Current voltage regulator. using 7805
I a have a battery that supplies a a voltage range of 11.1 - 12.4V depending on how charged it is.
I would like to regulate this down to 5v. The issue is I would need to draw up to 6 amps through it. ...
0
votes
1answer
70 views
Crock pot on power inverter
I have a slow cooker crock pot thats uses 120 volts AC which range from 0.6 amps to 2 amps and consume electricity that ranges from 70 watts (low temperature) to 250 watts (high temperature). When I ...
0
votes
1answer
102 views
Choosing an appropriate voltage regulator to limit power consumption
I am new to the electronics world and trying to figure out how to choose the battery for the circuit.
The circuit consists of an ATMega328P-PU, a DS2321 RTC and a PIR motion detector sensor. It needs ...
0
votes
1answer
83 views
LDO requirement for battery powered micro-controllers [closed]
What are the selection parameter for battery powered ultra low powered application?
(Battery capacity of 3700mAh, 3.7V 18650 Li-ion)
I'm designing an application with MSP430/Atmega328 + RF micro-...
0
votes
0answers
29 views
Total Power Cutoff circuit
I'm designing a battery controlled circuit using a 555 timer to control a mosfet to provide power to a load. The problem I'm trying to solve is to reduce the current draw while the circuit is not ...
0
votes
1answer
36 views
How to prevent circuit from shutting down when motor drain too much power
I have a device which has motor and circuits with PLC. This device is connected to a 12v battery which is powering the PLC and motor. Everything is working fine but when the motor's load is heavy, it ...
1
vote
1answer
71 views
Simple low power rising and falling edge enabled circuit
I am working on a project where I use an esp8266 and a reed switch sensor (NO), this is powered by a battery so I need a low power circuit that can turn on the esp8266 when the state of the reed ...
1
vote
0answers
77 views
Battery management - disconnect battery like this?
For a portable device i have the following battery management circuitry:
I'm using the MCP73871 for charge management and power oring and the BQ2972 for over discharge protection. If VBUS is ...
0
votes
0answers
26 views
Full charged battery age
I design a schematic for a alarm device. I use a trigger IC use 40nA and i want to use a 2500 mAh Li-Ion battery. The device is used at outdoor (-20/60 C) at least 2 year.
I want to ask that a fully ...
1
vote
2answers
119 views
How bad would it be for a NiMH battery or/compared to a Lithium-ion battery in a device to sit unused for years?
I have a Sonicare toothbrush which has Lithium-ion battery and a body hair trimmer that has a NiMH battery.
I have charged the Sonicare once or twice without ever using it, just to stop it go to 0% ...
0
votes
3answers
62 views
amplify/increase current from 9v battery
I have a working circuit that generates a signal (a range of slow and fast tones) and sends them to a speaker. I tried to switch to a piezo driver and speaker and was successful using the MAX9788 as ...
0
votes
1answer
59 views
Can I work 30 of these Solenoid Valves from a battery?
The (30) solenoid valves are 12v, all identical, each controlled by a relay and are rated at 6.2 watts of power consumption.
They will all be turned on simultaneously and turned off separately. This ...
1
vote
1answer
146 views
Identify dead component in notebook battery
Battery name is GARDA31, based on bq29330 and bq8030.
Most probably I killed it myself when soldering by shorting terminals with solder wire :( Controller is alive (communicates through SMbus), but ...
0
votes
1answer
56 views
Converting Battery Operated Motion Sensor Light to AC Powered
I have converted many battery powered devices to AC adapter in the past. This time around I am using a Motion Sensor light which takes 4 C batteries and is used to light a closet.
When I connect a ...
0
votes
0answers
32 views
Can I put two loads on one battery and both loads draw 3.7v as they expect?
I have a project in mind where I replace the tinny 40mAh LiPO battery of a "smart band" (Like a Mi Band 1) and replace it with a regular 18650 LiPo battery, so it last a long time without recharging. ...
21
votes
6answers
8k views
Can I disable a battery powered device by reversing half of its batteries?
When I have a device that is powered by two batteries, can I disable it by turning one battery around?
For illustration, the purpose is to leave batteries in the device for storage, but it does not ...
0
votes
2answers
211 views
Charging 3.7 V Li Ion battery with 5 V DC [closed]
I am trying to create a charge circuit to charge nominal 3.7 V (range of 3.5 V to 4.2 V depending on state of health) li-ion battery from 5 VDC. I don't want to use specialized charging ICs if ...
0
votes
1answer
31 views
Directly wire inverter to switches/lights/etc [closed]
I have a 12V deep cycle marine battery that is charged by a 20W solar panel. This works well. However I would like to use the battery to run two 120V 170mA 15W LED lights in a shed. So as I understand ...
0
votes
0answers
73 views
Using BMS in serial with parallel charging
Is it possible to connect two 4.2V 18650 Li-ion batteries in series but have them charged in parallel with 5V Usb wall charger? I have HX-1S-3576 as BMS. If i use 4 of these BMS as shown in the ...
1
vote
1answer
50 views
Power-supply made of battery+solar cell, ultra low power
In various scientific calculators, we can see that they have "twin" power, basically a mixture of a solar cell and a battery. I would like someone to tell me what kind of circuit usually takes both ...
1
vote
1answer
53 views
Using a modified non-proprietary battery for CPAP
My apologies if this isn't the correct place for this question. I am not familiar enough with some of these concepts to move forward on this without bouncing the ideas off of some more experienced ...
0
votes
2answers
83 views
How to heat an e-cigaret coil
I am working on making my own "mod" for an e-cigaret (A mod is the device that controls when and how much the coil is heated up to)
I have read a lot about it during the last couple of days, so i ...
0
votes
0answers
61 views
Motor driver powered by PSU instead of battery [duplicate]
I am about to use a motor driver in a project (MDDS30 by Cytron) and I was going to power it using a 12v 11.5a PSU. I discovered that the manufacturer warns against using a PSU, and that it might ...
2
votes
3answers
118 views
Real thing or just misinterpretation? Rotating batteries to make TV remote work
When TV remote isn't working, I rotate the batteries in the remote in their place and it begins to work. I don't see any kind of deposit between the batteries and the contacts. Rotation of battery ...
1
vote
1answer
77 views
Does a CR2032 take damage when connected to a 5V rail?
I've seen applications (Nintendo game cartridges, for example) that uses a coin cell battery for backup power to some RAM-chips (for savegames). When the ordinary 5V is gone, the battery takes over ...
1
vote
2answers
222 views
Do Duracell AAA batteries have internal short circuit detection?
I was shorting a Duracell AAA battery in a SAFE area with proper precautions. After 2 minutes I disconnected the circuit and measured the voltage, it dropped from 2.8V to 2.6V and the battery was hot. ...
0
votes
0answers
47 views
Is there a circuit that conserves energy of multiple power sources?
Say I have several batteries. To start all the batteries are "dormant"; there is no current running through them. Starting with the first battery it runs current through it until it dies, wherein the ...
1
vote
1answer
112 views
Measuring battery voltage and impedance
I have been trying to figure out how to properly measure battery voltage for a few days. The more I read, the less I understand. I know there are many questions like this out in the internet and I ...
0
votes
4answers
82 views
Reverse polarity protection for battery powered application
Im designing battery powered application and need reverse polarity protection.
My system specs: 4.5v(3x AA batteries) in and system running on 3.3v. Im using MCP1711T-33I/OT LDO to convert 4.5v to 3....
0
votes
3answers
101 views
Wind turbine charger controller
I need help on my design which includes a wind turbine, charge controller, battery and load.
The question is, what will happen to the load if the wind turbine is charging the battery and while it is ...
0
votes
2answers
103 views
What is the peak current for CR, LIR and AA batteries?
I'm working on a project that requires low energy consumption. In standby mode, it will consume about 11uA. However, when it starts working (it will transmit data in RF), the current goes up to 121mA. ...
4
votes
1answer
161 views
Do high and low side labels on bidirectional logic level converters matter?
Logic level converters like this one from Sparkfun have high side and low side labels on them. Now i have an application where I think I need to shift logic levels but the high side and the low side ...
3
votes
1answer
67 views
Rectifying reversible polarity battery with minimal power loss
I'd like to build a battery-powered DC power supply that will accept a single-cell battery in either polarity (i.e. it doesn't matter which way you put the battery in). I'm thinking of using the ...
13
votes
4answers
5k views
Does it matter if a fuse is connected to the negative or positive terminal of a battery?
I am currently going through the conundrum of where to place a fuse in my DC battery-powered circuit to protect the circuit components and the DC battery. I've been googling for a definitive answer, ...
1
vote
1answer
62 views
How to power a 10-watt electric circuit without grid connection in cold countries? [closed]
What options do we have for powering electric circuits without access to electric grid? For instance, to power a 10 watt LED lighting at night? The motivation to the project is to add some lighting in ...
0
votes
1answer
164 views
Noisy op amp buffer
I made an op amp buffer using a TL071 for my guitar but it is very noisy.
The circuit is a simple follower. Originally I had no feedback resistor but I added it later in case it decreased the noise ...
0
votes
1answer
44 views
Voltage regulator STBY & OFF - whats the difference?
I am looking at MAX883 voltage regulator and from the documentation is not very clear whats the difference.
It says this about pin OFF:
In this mode, the pass transistor, control circuit, ...
9
votes
10answers
3k views
Would a 7805 5 V regulator drain a 9 V battery?
Doing some DIY as a hobby, I'm making a small humidity-temperature radio sensor.
An ATmega328 is reading from a DHT11 sensor and then transmitting data to a Raspberry Pi by an STX882 radio ...
0
votes
1answer
111 views
Combining power input and USB data port for a Raspberry Pi Zero (W)
I am attempting to design some peripheral circuit around a Raspberry Pi Zero W for a portable project. It will be powered by a lithium battery. I want to bring out the USB port of the Pi; I also ...
